22% vs 14% Magnesium Glycinate: What the Percentage Actually Means (and Why Buffered Is Not Bad)

Updated 28 September 2026: clarified raw-material testing limits, clinical-study scope and label arithmetic. Original publication date retained.

Magnesium Ka Math · HealthyHey Science Desk

Two jars. Both say magnesium glycinate. Both give you 121 mg of magnesium per serving. One says 14%, the other 22%. This is the complete, referenced explanation of what those numbers mean, why the chemistry caps pure bisglycinate at 14%, what the extra magnesium in a 22% product is, and how to choose between them without being misled in either direction.

Published 14 September 2026 Reading time about 25 minutes 36 references, peer-reviewed where available Written for the general reader, with marked technical sections

The 60-second answer

  • The percentage is the share of the ingredient's weight that is actual magnesium, called elemental magnesium. It is not a measure of quality, purity or absorption.
  • Pure anhydrous magnesium bisglycinate is approximately 14.1% magnesium by weight. Hydration lowers the percentage. A measured percentage alone is not a chemical-identity test: a compatible number does not prove chelation.
  • A declared ratio materially above 14.1% is inconsistent with pure anhydrous bisglycinate on the same weight basis, if both label figures are accurate. It is a reason to ask for clarification, not an identification test for oxide or any other specific ingredient. Buffered formulations declare additional magnesium sources.
  • Buffered does not mean bad. Magnesium oxide is a permitted magnesium source under Indian, EU, Canadian and US rules, and the human absorption evidence is more mixed than the internet suggests.7,16,17,31
  • The real issue worldwide is disclosure: products sold as 100% chelated that quietly contained oxide have triggered a Health Canada recall and US class-action settlements.28,29,30
  • Same magnesium, different vehicle. A 14% fully chelated product delivers 121 mg from two capsules of pure bisglycinate. A 22% product delivers the same 121 mg from one capsule of glycinate plus additional magnesium. Choose by preference, not by fear.

Why glycine makes magnesium "heavy" Plain English

Magnesium never travels alone in a supplement. On its own it is a reactive metal, so it is always bound to a partner: an oxide, a citrate, a chloride, or, in the case of glycinate, the amino acid glycine. What you swallow is the magnesium plus its partner, and the partner has weight.

Think of magnesium as the passenger and the partner as the vehicle.

In magnesium bisglycinate, every magnesium passenger travels with two glycine molecules, like a passenger who insists on two seats. Two glycines together weigh about six times more than the magnesium they carry. So in a jar of pure bisglycinate, only about 14 grams out of every 100 grams is the passenger. The other 86 grams is seating.

In magnesium oxide, the passenger travels with a single oxygen atom, which weighs less than the magnesium itself. About 60 grams out of every 100 grams is passenger. Same magnesium, far less vehicle.

A 22% product is a coach that seats some passengers in the roomy two-glycine section and some in the compact oxide section. The passengers are identical. The magnesium ion your intestine eventually absorbs is the same Mg²⁺ in both cases. What differs is how much vehicle you swallowed to get it there.

This is why the same 121 mg of magnesium needs 864 mg of pure bisglycinate (two large capsules) but only 550 mg of a 22% blend (one capsule). It is not that the 14% product is "weaker". It is that glycine takes up room.

Two routes to the same 121 mg of magnesium 14% FULLY CHELATED Magnesium bisglycinate only 432 432 2 capsules · 864 mg compound 121 mg magnesium 22% Glycinate plus additional magnesium 550 1 capsule · 550 mg compound 121 mg magnesium Same magnesium. The difference is how much vehicle you swallow to get it.
Figure 1. Both formats deliver 121 mg of elemental magnesium per serving. The 14% needs more compound weight because glycine is heavy.

Magnesium ka math: the arithmetic behind 14% and 22% Technical

The numbers on the label are not marketing choices. They come straight from molecular weights, which anyone can verify from a chemistry reference.1

Magnesium bisglycinate, anhydrous: Mg(C₂H₄NO₂)₂ formula C₄H₈MgN₂O₄ Molar mass = 172.42 g/mol Magnesium = 24.31 g/mol Mg fraction = 24.31 / 172.42 = 0.1410 → 14.1 % Hydrated grades (water adds weight, magnesium does not change): Monohydrate 190.43 g/mol → 12.8 % Dihydrate 208.45 g/mol → 11.7 % Magnesium oxide: MgO Molar mass = 40.30 g/mol Mg fraction = 24.31 / 40.30 = 0.603 → 60.3 %

So a jar of magnesium bisglycinate can never be more than 14.1% magnesium. Commercial material usually assays a little lower because it holds some water; suppliers list standard grades at 13 to 14%, and one Indian manufacturer advertises exactly 14.1%.4,6 The best recent clinical trial of magnesium bisglycinate used a raw material assaying 14.0% (893 mg of compound to deliver 125 mg of magnesium).19

Measured total magnesium, not measured chelation. Eureka report TR-26-EKA1-090488-02 records 14.01% total magnesium and 0.73 g/100 g moisture for submitted raw-material lot MG/GCN/010826. The magnesium percentage is compatible with bisglycinate composition, but does not prove chemical identity, exclude other magnesium sources or establish the percentage chelated. Read the certificate and its limitations.

Fully chelated, single source
14%
Compound per serving
864 mg magnesium bisglycinate
Elemental magnesium
864 × 0.14 = 121 mg
Capsules per serving
2
Magnesium sources
Bisglycinate only
Glycinate plus additional magnesium
22%
Compound per serving
550 mg magnesium glycinate blend
Elemental magnesium
550 × 0.22 = 121 mg
Capsules per serving
1
Magnesium sources
Bisglycinate + a second magnesium source

What 550 mg of pure bisglycinate would give you

This is the calculation that informed buyers are doing in the comments of every Indian magnesium listing, and it is correct:

550 mg × 0.141 = 77.6 mg magnesium (maximum, anhydrous) 550 mg × 0.128 = 70.4 mg magnesium (monohydrate)

A label declaring 121 mg elemental magnesium from 550 mg of glycinate gives a ratio of 22%. On a comparable weight basis, that is inconsistent with pure anhydrous bisglycinate if both declarations are accurate. Check the full ingredient list and ask the manufacturer to reconcile the figures; arithmetic alone does not identify an undeclared ingredient.

How much of a 22% blend is the second source?

Illustrative calculation, not a measured product formula. The example below assumes exactly two anhydrous ingredients: bisglycinate and magnesium oxide. It cannot establish the proportions in an actual product. HealthyHey declares magnesium hydroxide, not oxide, in its 22% formulation; its composition must not be inferred from this oxide example.

Let x = weight fraction of MgO in the blend 0.603·x + 0.141·(1 − x) = 0.22 0.462·x = 0.079 → x ≈ 0.17 A 22% blend is roughly 83% bisglycinate and 17% magnesium oxide by weight. Per 550 mg capsule: ~456 mg bisglycinate → ~64 mg Mg (53 % of the magnesium) ~ 94 mg MgO → ~57 mg Mg (47 % of the magnesium) 121 mg Mg total
Hypothetical oxide blend Mostly glycinate by weight. The magnesium itself splits almost evenly. By weight of the 550 mg blend Bisglycinate ~83% (456 mg) ~17% By magnesium delivered (121 mg) From glycinate ~53% (64 mg) From the second source ~47% (57 mg) Worked for magnesium oxide as the second source. A hydroxide blend would need about 29% by weight.
Figure 2. Hypothetical bisglycinate–oxide arithmetic, not a measured product composition. Weight share and magnesium share differ.

These proportions apply only to the hypothetical two-ingredient calculation above. They are not a measured composition of HealthyHey or any other finished product. Different declared sources, hydration and formulation ingredients change the calculation.

So what exactly is in a 22% magnesium glycinate? Plain English

It is a formulation called buffered magnesium glycinate (or buffered bisglycinate chelate). The term was popularised by Albion Minerals, the US company that pioneered amino-acid chelates and is now part of Balchem. Their catalogue carries both an "original" magnesium bisglycinate chelate and a "buffered" version, which their own product page describes as using an additional excess of magnesium oxide to combine a high elemental magnesium value with the bioavailability of the chelate.3

Other ingredient suppliers sell the same concept under plain names: a 13% anhydrous bisglycinate on one page, and 18% and 20% "buffered" bisglycinate grades on the next, described as bisglycinate blended with magnesium oxide.4,5 In India, 22% is in fact the most common ratio on the shelf: the familiar "2000 mg magnesium glycinate gives 440 mg magnesium" format used by several national brands is a 22% ingredient, and at least one Indian brand labels its 22% product openly as "Buffered".

So the 22% number is not an invention or an anomaly. It is what a standard buffered grade looks like on a label.

Buffered formulations can change ingredient weight, capsule count and cost. Capsule capacity also depends on size, powder density and excipients; one capsule is not, by itself, evidence of an inauthentic product. Compare the complete ingredient declaration and labelled serving.

"Buffered" is not "bad": what the evidence says Plain English

Somewhere along the way, "contains magnesium oxide" became internet shorthand for "worthless" or even "fake". That is not what the regulatory record or the clinical literature says. Four points matter.

1. Magnesium oxide is a permitted, safe magnesium source everywhere

In India, magnesium oxide is listed as a permitted source of magnesium under Schedule I of the FSSAI nutraceutical regulations.31 In the European Union it is in Annex II of the Food Supplements Directive, and the European Food Safety Authority's 2008 opinion on bisglycinates confirmed magnesium bisglycinate is also of no safety concern as a magnesium source.2 Health Canada licenses magnesium oxide products, and the US National Institutes of Health lists it among the standard supplemental forms.22 Magnesium oxide is, in fact, one of the most-studied magnesium salts in clinical trials, including cardiovascular and constipation trials at doses far higher than any capsule of buffered glycinate contains.13,20

2. The magnesium your body absorbs is the same ion

Whatever the partner, magnesium is absorbed in the gut as the Mg²⁺ ion, mostly by passive diffusion between cells in the small intestine, with an active transport route (the TRPM6/7 channels) handling the rest.16 Once absorbed, the body cannot tell whether a given magnesium ion arrived from glycinate or from oxide. The differences between forms are about how much gets absorbed and how comfortable the journey is, not about what the magnesium does once it is in the blood.

3. The "oxide absorbs 4%" figure is real but misread

The number that launched a thousand Reels comes from a 2001 study by Firoz and Graber, which measured urinary magnesium in healthy volunteers after roughly 21 mEq per day of four preparations. Magnesium oxide showed a fractional absorption of about 4%, while magnesium chloride, lactate and aspartate were higher and equivalent to each other.8 Two things are usually left out. First, that study did not test glycinate at all, so "glycinate absorbs four times better than oxide" is not what it found. Second, the authors' own conclusion was that inorganic salts can be as bioavailable as organic ones depending on the preparation; the poor result belonged to that oxide preparation at that dose, not to inorganic magnesium as a class.

A small trial in ileal-resection patients is not evidence of equivalence in most people

The 1994 crossover trial involved 12 patients who had undergone ileal resection. It found no overall absorption difference between diglycinate and oxide, with a chelate advantage in four patients with the poorest absorption and better reported tolerability. This narrow population does not establish equal absorption in healthy adults or compare HealthyHey's two formulations. Original trial.

The magnesium salt matters less than people think. The dose, the food it is taken with, and the person's existing magnesium status matter more. That is the conclusion of the most thorough modern review of magnesium bioavailability.16

What the absorption studies actually show, study by study Technical

Because this is the part most often exaggerated in both directions, here is the human evidence laid out plainly. Where a study compared oxide with an organic salt, the organic salt was usually citrate, not glycinate, so read the "glycinate" column with that in mind.

Study Design Forms compared What it found
Lindberg 199010 In-vitro solubility + urinary load test, healthy adults Citrate vs oxide Oxide nearly insoluble in water and only 43% soluble even in simulated peak stomach acid; citrate more soluble and gave a larger urinary magnesium rise.
Schuette 19947 RCT crossover, n = 12, stable isotope, ileal resection patients Diglycinate vs oxide 23.5% vs 22.8% absorption overall (no difference); chelate better in the four worst absorbers and better tolerated.
Firoz & Graber 20018 Urinary excretion, healthy adults Oxide vs chloride, lactate, aspartate Oxide about 4% fractional absorption; the other three higher and equal. Glycinate not tested.
Walker 20039 RCT, n = 46, 300 mg/day for 60 days Amino-acid chelate vs citrate vs oxide vs placebo Citrate and chelate showed greater urinary magnesium at 60 days than oxide; oxide not different from placebo on that measure; citrate highest serum levels.
Coudray 200514 Rat stable-isotope study, 10 salts Oxide, chloride, sulphate, carbonate, acetate, pidolate, citrate, gluconate, lactate, aspartate Absorption 50 to 67% for all ten; organic salts slightly higher; gluconate highest. Oxide was not an outlier.
Shechter 201213 RCT crossover, n = 41, one month each Oxide 520 mg/day vs citrate 296 mg/day Oxide raised intracellular magnesium and lowered LDL more than citrate. Doses were unequal, so this shows oxide works, not that it beats citrate mg for mg.
Kappeler 201711 RCT crossover, n = 20, single dose Citrate vs oxide Higher urinary excretion and serum magnesium after citrate.
Werner 201912 RCT crossover, n = 14, magnesium-saturated men, 400 mg Citrate vs oxide Citrate produced a significant rise in 24-hour urinary magnesium and plasma magnesium; oxide did not reach significance.
Blancquaert 201915 In-vitro digestion of 15 products, then n = 30 in vivo Best vs worst dissolving product Products that dissolved poorly in vitro also raised serum magnesium less in people. Formulation, not just salt, drives the result.
Schuchardt & Hahn 201716 Narrative review All forms Salt type "appears less relevant than is often thought"; dose, meal composition and status dominate; higher absorption is followed by higher excretion.
Pardo 202117 Systematic review, 14 studies Organic vs inorganic Inorganic forms appear less bioavailable and absorption is dose-dependent, but all forms maintain normal levels in healthy people without a prior deficit.

These studies differ in formulation, dose, participants and outcome measurements. A study of citrate versus oxide does not directly answer a question about buffered versus non-buffered bisglycinate. The sources discussed here do not establish a numerical absorption advantage, equivalence or better clinical outcomes for HealthyHey 14% versus HealthyHey 22%.

What about the laxative effect?

Tolerability depends on the actual formulation, dose and individual. A laxative trial at a much larger dose cannot establish that a lower-dose product will cause no bowel effects. Nor does an assumed oxide percentage establish the composition or tolerability of a hydroxide-buffered product. Neither HealthyHey format is guaranteed to be free of digestive side effects.

The real problem is disclosure, not oxide Plain English

Here is where the criticism of "22% glycinate" is fair, and it is important to say so plainly. The problem was never that buffered products exist. The problem is products sold as "100% chelated" or "pure bisglycinate" that were actually buffered, and consumers paying a chelate price for something they were not told about. The last two years have made this a global compliance issue:

  • Health Canada recall, 12 November 2025. Life Brand Magnesium Bisglycinate 200 mg, sold at Shoppers Drug Mart, was recalled for "an undeclared ingredient (Magnesium Oxide)", covering every lot made since July 2023. A second brand's bisglycinate was recalled for the same reason two weeks later.28
  • NOW Foods’ testing, dated 1 December 2022. NOW reported total and water-soluble magnesium results for 16 Amazon products, including two of its own. This is manufacturer-sponsored testing, not a current survey of Indian products. The report interprets soluble magnesium as chelated magnesium; that interpretation should not be treated as a universally validated chelation assay. Read the original report.
  • US class actions. Nutricost agreed to a US$1.835 million settlement over claims that its "magnesium glycinate" did not contain the labelled amount of magnesium as glycinate, with preliminary court approval in May 2026. Similar suits were filed against BulkSupplements and Qunol's maker.30
  • India. In August 2026 the food-label commentator Food Pharmer warned his audience that the front of a magnesium jar "can be VERY misleading", showing "Magnesium Glycinate" in large type while the product also contains cheaper forms such as magnesium hydroxide.32 He is right, and the fix is the same everywhere: declare every magnesium source in the ingredient list and state elemental magnesium per serving.

Notice what these cases have in common. Nobody was harmed by magnesium oxide. Consumers were harmed by not being told. That is the line this article draws: buffered is fine; undeclared buffering is not.

The two things every honest magnesium label should tell you: (1) every magnesium source, by name, in the ingredient list, and (2) elemental magnesium per serving in milligrams. If a label gives only "magnesium glycinate 1000 mg" with no elemental figure, or an elemental figure above 14.1% of the glycinate weight with no second source declared, ask the brand which it is.

How to read any magnesium label in three steps Plain English

  1. Find the compound weight. "Magnesium glycinate 550 mg" is the weight of the whole compound, vehicle included.
  2. Find the elemental magnesium. This is the only number your body cares about. It is usually written as "providing 121 mg magnesium" or "elemental magnesium 121 mg". Compare it to the RDA (see below).
  3. Divide. Elemental magnesium ÷ declared ingredient weight × 100 gives the label ratio. Check that both figures refer to the same serving and weight basis. A ratio above the pure-form ceiling calls for clarification; a compatible ratio does not prove chemical identity.

Do it automatically. Our magnesium label calculator takes the two numbers off any label, works out the percentage, and tells you whether that figure is possible for a single ingredient or only for a blend. It works on any brand, ours included.

How much of each form is actually magnesium Elemental magnesium as a share of the compound's weight Magnesium oxide 60.3% Magnesium hydroxide 41.7% Magnesium carbonate 28.8% A 22% blend 22.0% Magnesium citrate 16.2% Magnesium malate 15.5% Magnesium bisglycinate 14.1% Magnesium lactate 12.0% Magnesium taurate 8.9% Magnesium L-threonate 8.3% 14.1% — the ceiling for pure bisglycinate Above the ceiling: check the weight basis and ask the manufacturer to reconcile the label.
Figure 3. Theoretical magnesium fractions for the stated forms. A label ratio is not a chemical-identity test; account for the weight basis and measurement uncertainty.
Form Formula Magnesium by weight Compound needed for 121 mg Mg Notes
Magnesium oxide MgO 60.3 % 201 mg Densest; nearly insoluble in water; permitted source.
Magnesium hydroxide Mg(OH)₂ 41.7 % 290 mg Milk of magnesia; also used in some buffered blends.
Magnesium carbonate MgCO₃ 28.8 % 420 mg Permitted source; found in some "glycinate" products by NOW's testing.
Magnesium citrate (tri-magnesium dicitrate) Mg₃(C₆H₅O₇)₂ 16.2 % 747 mg Well absorbed; mild laxative at high dose.
Magnesium malate MgC₄H₄O₅ 15.5 % 781 mg
Magnesium bisglycinate, anhydrous Mg(C₂H₄NO₂)₂ 14.1 % 858 mg The ceiling for any pure glycinate.
Magnesium bisglycinate, monohydrate · H₂O 12.8 % 945 mg Typical of many commercial lots.
Magnesium lactate Mg(C₃H₅O₃)₂ 12.0 % 1,008 mg
Magnesium chloride hexahydrate MgCl₂·6H₂O 12.0 % 1,008 mg
Magnesium sulphate heptahydrate MgSO₄·7H₂O 9.9 % 1,222 mg Epsom salt.
Magnesium taurate Mg(C₂H₆NO₃S)₂ 8.9 % 1,360 mg
Magnesium L-threonate Mg(C₄H₇O₅)₂ 8.3 % 1,458 mg
Buffered bisglycinate (typical) Bisglycinate + MgO 18 to 22 % 550 to 672 mg Blend; must declare both sources.

Percentages are calculated from standard atomic weights (Mg 24.305). Real lots vary by a point or two with moisture, which is why a good supplier certificate quotes magnesium "as is" and "on dry basis" separately.

What the tests can and cannot establish

Total magnesium measures quantity, not the original chemical form. Magnesium, glycine and moisture measurements can assess composition, but a plausible molar ratio alone cannot distinguish a reacted chelate from every physical mixture.

Ask the laboratory to propose complementary, validated identity methods for the actual material. FTIR comparison with appropriate references and controls can support interpretation; powder X-ray diffraction can look for crystalline non-glycinate phases within the method's detection limits. A non-detect does not rule out amorphous material or quantities below those limits.

Do not equate water-soluble magnesium with percentage chelated unless that relationship has been validated for this material and preparation. For any claimed degree of chelation, require the method, controls, uncertainty and limits, including whether sample preparation changes the species being measured.

A percentage materially above approximately 14.1%, on a comparable weight basis and beyond uncertainty, is inconsistent with pure anhydrous bisglycinate. It does not identify the extra source. A result at or below the ceiling does not establish full chelation.

Which one is right for you? Plain English

Both formats give the same 121 mg of elemental magnesium per serving. The choice is about form, capsule count and cost, not about one being "real" and the other not.

14% Fully Chelated 22%
Magnesium per serving 121 mg 121 mg
Magnesium source(s) Magnesium bisglycinate only Magnesium glycinate plus additional magnesium
Capsules per serving 2 1
Compound weight per serving 864 mg 550 mg
Servings per 120-capsule jar 60 120
Best suited to People who prefer the declared non-buffered bisglycinate formulation and a two-capsule serving People who want one capsule a day, a lower cost per serving, and a smaller pill

The 14% product is positioned for buyers who prefer its declared non-buffered formulation. The 22% product declares magnesium glycinate plus magnesium hydroxide and has a one-capsule serving. Neither the raw-material assay nor the cited trials establish a clinical absorption or tolerability advantage for one HealthyHey format over the other. Follow your clinician's advice for deficiency or malabsorption.

Dose, safety and the Indian RDA Technical

The Indian Council of Medical Research and National Institute of Nutrition set the 2020 recommended dietary allowance for magnesium at 440 mg/day for adult men and 370 mg/day for adult women, with estimated average requirements of 370 and 310 mg.23 Those figures include food, and Indian diets built on whole grains, pulses, nuts and green vegetables supply a good share of it. Most people using a supplement are topping up, not replacing.

Magnesium shortfall is common rather than rare. Almost half of the US population eats less magnesium than it needs, and because more than 99% of body magnesium is inside cells, a normal blood test does not rule out a low store.24,25 In India the picture is best documented in metabolic disease: a global meta-analysis found low serum magnesium in about a third of people with type 2 diabetes, with Asia the highest region, and a North Indian study of apparently healthy adults found serum magnesium inversely correlated with fasting glucose and insulin resistance.26,27

The US adult upper intake level of 350 mg/day applies to magnesium from supplements and medicines, not food. It is not a target dose or an assurance of safety for every person. Check with a clinician if you have kidney disease, and ask a pharmacist about medicine-specific interactions. NIH reference.

Two practical points from the absorption literature apply to both formats. Fractional absorption falls as the dose rises, so splitting a daily amount into smaller doses absorbs a greater share of it.16 And taking magnesium with a meal, rather than on an empty stomach, increased urinary magnesium in a classic study of both citrate and oxide.10,16

Frequently asked questions Plain English

Is magnesium glycinate the same as magnesium bisglycinate or diglycinate?

Yes. All three names refer to the same compound, one magnesium ion bound to two glycine molecules, registered under CAS number 14783-68-7.1 There is no separate registry entry for a 1:1 "magnesium glycinate" nutritional ingredient. When you see "glycinate" on an Indian label it means bisglycinate, and its magnesium content is capped at 14.1%.

If 22% is a blend, why not just take magnesium oxide and save money?

Compare the actual formulation, dose, tolerability, price and advice relevant to your needs. The cited small trial in ileal-resection patients does not establish that a commercial glycinate blend is clinically superior to oxide for healthy adults.

Does "fully chelated" have a legal definition?

The wording on the label is not itself a test of chemical identity. Ask the supplier for its specification and supporting methods, and ask an appropriate laboratory how identity or degree of chelation can be assessed for the actual material. The tests and their limitations matter.

Does magnesium glycinate help sleep?

A 2025 randomised trial in 155 adults reporting poor sleep tested 250 mg elemental magnesium daily as bisglycinate for four weeks and found a small average improvement in insomnia scores compared with placebo. The dietary-magnesium subgroup finding was exploratory. This was not a trial of HealthyHey’s 121 mg serving and does not establish a sleep-treatment claim for this product. Read the trial.

My 22% jar says 550 mg and 121 mg. Is that a labelling error?

Those figures give a 22% ratio, which is inconsistent with pure anhydrous bisglycinate if the declared figures and weight basis are accurate. Check the complete ingredient list and ask the manufacturer to reconcile any mismatch. HealthyHey’s 22% formulation declares glycinate plus magnesium hydroxide.

Why does the 14% jar need two capsules?

Two capsules are the labelled serving for HealthyHey's 14% formulation, providing 864 mg of the magnesium glycinate ingredient. Capsule capacity varies with size, powder density and excipients. Capsule count alone is not a test of chelation or authenticity.

Can I trust an independent "lab tested" video?

Check the sample, batch, method and parameter measured. Total magnesium measures quantity, not the original chemical form. Claims about a specific non-glycinate phase require appropriate identity evidence; neither a total assay nor a simple solubility result is universal proof of percentage chelated.

About this article Plain English

This page is published by HealthyHey Nutrition, which manufactures and sells magnesium supplements in India. It discusses and links to HealthyHey products and evidence, so it is a brand-authored educational article, not an independent product evaluation.

If you find an error in the chemistry, the arithmetic, or our reading of a cited study, tell us and we will correct it and record the correction here.

The arithmetic in this article is also available as a tool: the magnesium label calculator.

This article is educational and is not medical advice. Magnesium supplements are not intended to diagnose, treat, cure or prevent any disease. Consult a qualified healthcare professional before starting any supplement, particularly if you are pregnant, breastfeeding, have kidney disease, or take prescription medicines. Chemical percentages are calculated from standard atomic weights; commercial lots vary with moisture content. Study findings are summarised from the cited sources; please read the originals.

References

Peer-reviewed studies were retrieved from PubMed and are linked by DOI where one exists. Regulatory, supplier and news sources are linked directly. Accessed September 2026.

  1. PubChem. Magnesium glycinate (magnesium bisglycinate; magnesium diglycinate), CAS 14783-68-7, C₄H₈MgN₂O₄, molar mass 172.42 g/mol. National Library of Medicine. pubchem.ncbi.nlm.nih.gov
  2. EFSA Panel on Food Additives, Flavourings, Processing Aids and Materials in Contact with Food. Opinion on certain bisglycinates as sources of copper, zinc, calcium, magnesium and glycinate nicotinate as source of chromium in foods intended for the general population (including food supplements). EFSA Journal 2008;718:1-26. doi:10.2903/j.efsa.2008.718
  3. Balchem / Albion Minerals. Magnesium Bisglycinate Chelate: original and buffered grades ("the buffered form utilizes an additional excess of magnesium oxide to combine high elemental magnesium value with high bioavailability"). balchem.com
  4. Vita Actives. Magnesium bisglycinate anhydrous [13% Mg] powder; Magnesium bisglycinate buffered [18% Mg] and [20% Mg] grades. vitaactives.com
  5. Kangyo Biochem. Magnesium glycinate (amino acid chelate) product specification, standard and buffered (with magnesium oxide, 20% Mg) grades. kangyomineral.com
  6. Global Calcium Pvt Ltd. Magnesium bisglycinate, 14.1% elemental magnesium. globalcalcium.com
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  9. Walker AF, Marakis G, Christie S, Byng M. Mg citrate found more bioavailable than other Mg preparations in a randomised, double-blind study. Magnes Res 2003;16(3):183-191. PMID 14596323
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  11. Kappeler D, Heimbeck I, Herpich C, et al. Higher bioavailability of magnesium citrate as compared to magnesium oxide shown by evaluation of urinary excretion and serum levels after single-dose administration in a randomized cross-over study. BMC Nutrition 2017;3:7. doi:10.1186/s40795-016-0121-3
  12. Werner T, Kolisek M, Vormann J, et al. Assessment of bioavailability of Mg from Mg citrate and Mg oxide by measuring urinary excretion in Mg-saturated subjects. Magnes Res 2019;32(3):63-71. doi:10.1684/mrh.2019.0457
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  14. Coudray C, Rambeau M, Feillet-Coudray C, et al. Study of magnesium bioavailability from ten organic and inorganic Mg salts in Mg-depleted rats using a stable isotope approach. Magnes Res 2005;18(4):215-223. PMID 16548135
  15. Blancquaert L, Vervaet C, Derave W. Predicting and testing bioavailability of magnesium supplements. Nutrients 2019;11(7):1663. doi:10.3390/nu11071663
  16. Schuchardt JP, Hahn A. Intestinal absorption and factors influencing bioavailability of magnesium: an update. Curr Nutr Food Sci 2017;13(4):260-278. doi:10.2174/1573401313666170427162740
  17. Pardo MR, Garicano Vilar E, San Mauro Martín I, Camina Martín MA. Bioavailability of magnesium food supplements: a systematic review. Nutrition 2021;89:111294. doi:10.1016/j.nut.2021.111294
  18. Ranade VV, Somberg JC. Bioavailability and pharmacokinetics of magnesium after administration of magnesium salts to humans. Am J Ther 2001;8(5):345-357. doi:10.1097/00045391-200109000-00008
  19. Schuster J, Cycelskij I, Lopresti A, Hahn A. Magnesium bisglycinate supplementation in healthy adults reporting poor sleep: a randomized, placebo-controlled trial. Nat Sci Sleep 2025;17:2027-2040. doi:10.2147/NSS.S524348
  20. Morishita D, Tomita T, Mori S, et al. Senna versus magnesium oxide for the treatment of chronic constipation: a randomized, placebo-controlled trial. Am J Gastroenterol 2021;116(1):152-161. doi:10.14309/ajg.0000000000000942
  21. Costello R, Rosanoff A, Nielsen F, West C. Perspective: call for re-evaluation of the tolerable upper intake level for magnesium supplementation in adults. Adv Nutr 2023;14(5):973-982. doi:10.1016/j.advnut.2023.06.008
  22. National Institutes of Health, Office of Dietary Supplements. Magnesium: fact sheet for health professionals. ods.od.nih.gov
  23. ICMR-National Institute of Nutrition. Nutrient requirements for Indians: recommended dietary allowances and estimated average requirements, 2020. nin.res.in
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How to cite this article: HealthyHey Nutrition. "22% vs 14% Magnesium Glycinate: What the Percentage Actually Means (and Why 'Buffered' Is Not 'Bad')." HealthyHey Science Desk, 14 September 2026.