Magnesium bisglycinate (also written magnesium glycinate) is one of the magnesium forms with the best oral bioavailability and most favorable digestive tolerance among the salts available in supplementation. The properties of magnesium bisglycinate and its absorption profile explain why it is the preferred form in professional formulation to support the nervous system, sleep and the reduction of tiredness. The standardized reference form in clinical research is Albion TRAACS®, a patented mineral chelate (Balchem/Albion Minerals) in which the magnesium ion is bound to two glycine molecules with a structurally verified bond. Magnesium contributes to the reduction of tiredness and fatigue, to normal functioning of the nervous system, to normal psychological function, to electrolyte balance, to normal energy-yielding metabolism, to the maintenance of bones and teeth, to protein synthesis and to the process of cell division — a total of nine physiological functions officially authorized at the European level. This page covers what magnesium bisglycinate is for, its properties, the differentiation from other salts, its use for sleep, the studied doses, the precautions and where it fits in the Pleniage portfolio.
What is magnesium bisglycinate?
Magnesium bisglycinate is a chelated salt (also called a mineral chelate) in which the magnesium ion (Mg²⁺) is bound to two molecules of glycine, the simplest amino acid in the body. The resulting chemical structure (Mg + 2 glycines) has a stable affinity that improves the intestinal absorption of the mineral compared with traditional inorganic salts such as magnesium oxide.
The term "bisglycinate" is used to emphasize that there are two (bis-) glycine molecules for each magnesium atom. In the scientific literature it also appears as magnesium glycinate or magnesium bisglycinate; both names refer to the same compound. These designations are equivalent and interchangeable; "magnesium bisglycinate" is the most precise form, as it makes the two-to-one stoichiometry explicit.
What is it for? Functions authorized at the European level
Magnesium as a whole (regardless of the specific salt) has nine health claims officially authorized by the EFSA (European Food Safety Authority). These claims may be used on the labeling of food supplements that provide at least 15% of the nutrient reference value (NRV) per recommended dose.
Reduction of tiredness and fatigue
Magnesium contributes to the reduction of tiredness and fatigue (authorized EFSA claim, ID 244). A function directly linked to its role as an enzymatic cofactor in energy-yielding metabolism.
Nervous system and psychological function
- Normal functioning of the nervous system (authorized EFSA claim, ID 242).
- Normal psychological function (authorized EFSA claim, ID 245).
Electrolyte balance and energy metabolism
- Normal electrolyte balance (authorized EFSA claim, ID 238).
- Normal energy-yielding metabolism (authorized EFSA claim, ID 240).
Muscle function and protein synthesis
- Normal muscle function (authorized EFSA claim, ID 241).
- Normal protein synthesis (authorized EFSA claim, ID 246).
Bones, teeth and cell division
- Maintenance of normal bones (authorized EFSA claim, ID 239).
- Maintenance of normal teeth (authorized EFSA claim, ID 239).
- Process of cell division (authorized EFSA claim, ID 247).
Albion TRAACS® vs generic bisglycinate: what changes
Not all commercial bisglycinates are equivalent. The differences between the standardized bisglycinate Albion TRAACS® (Balchem) and generic bisglycinates can be substantial and affect whether the bioavailability data obtained in clinical research can be extrapolated.
- Structural verification of the chelate bond: TRAACS® (an acronym for The Real Amino Acid Chelate System) subjects each batch to verification by infrared spectroscopy that confirms the effective formation of the coordinate covalent bond between magnesium and glycine. Non-standardized bisglycinates may actually be physical mixtures (magnesium salt + free glycine, with no verified bond), which changes the real bioavailability.
- Elemental magnesium dose per gram: Albion TRAACS® bisglycinate declares a verified elemental magnesium concentration (typically around 14% in the "buffered" form most used in formulation). Generic bisglycinates with lower standardization may vary in this content.
- Purity and traceability: third-party certificates of analysis available, control of heavy metals and pesticides, manufacturing under US cGMP.
The practical consequence is that published bioavailability data on bisglycinate are not directly extrapolable to any product labeled as "bisglycinate"; it is worth verifying whether the ingredient declares the Albion TRAACS® source or another equivalent and verifiable standardization.
Bisglycinate vs other magnesium salts
Magnesium is marketed in supplementation as a salt (combined with an organic or inorganic anion). The most widely used salts, ordered by absorption profile and clinical use:
- Bisglycinate: a chelate with two glycines. High bioavailability and very low incidence of digestive discomfort. It is the preferred form in profiles of chronic supplementation focused on the nervous system, sleep and calm. It also provides glycine as an amino acid whose own profile includes a mild documented sedative effect.
- Citrate: high bioavailability (similar to bisglycinate). It has a mild laxative effect at high doses, which is why it is the form of choice when support for slow intestinal transit is also sought. To explore this profile further, see the Magnesium citrate page.
- Malate: a combination of magnesium with malic acid. Associated with energy-yielding metabolism; some studies propose it specifically in profiles with chronic muscle fatigue.
- L-threonate: a form with preclinical data suggestive of brain penetration; clinical evidence in humans is still limited and the commercial products are substantially more expensive.
- Oxide: the cheapest form and the one with the lowest oral bioavailability. Its main clinical use is as an osmotic laxative, not as a magnesium supplement for systemic repletion.
- Sulfate: the traditional "Epsom salts". Transdermal use (baths) or as an oral laxative. It is not the form of choice for oral repletion.
The meta-analysis by Pickering and colleagues published in Nutrients in 2020 synthesized the evidence on absorption and bioavailability of the different magnesium salts, placing bisglycinate in the group with the best absorption (together with citrate and malate) and ahead of oxide and sulfate.
How it works: mineral chelate and intestinal absorption
The term "chelate" (from the Greek chele, "claw") describes a chemical structure in which a metal ion is held by two or more simultaneous bonds to an organic molecule (in this case, two glycines). This architecture has two practical consequences:
- Additional absorption pathway: the chelate can be absorbed in the small intestine through short-peptide transporters, a route independent of the classic ionic channels for which inorganic magnesium competes with calcium, zinc and other minerals. This explains the greater bioavailability documented relative to oxide.
- Lower digestive osmotic effect: inorganic salts (oxide, sulfate) exert an osmotic effect in the intestinal lumen that draws in water and produces the well-known laxative effect. Bisglycinate, being absorbed mostly as an intact chelate, significantly reduces this phenomenon and is therefore well tolerated even at high doses.
Studied doses and time of day
The doses investigated in supplementation with magnesium bisglycinate usually range between 200 and 400 mg of elemental magnesium per day, in a single intake or divided into two. It is important to distinguish two numbers that are frequently confused:
- Elemental magnesium: the actual amount of the magnesium mineral (Mg). This is the number that the labeling must declare and the one compared with the NRV.
- Total bisglycinate: the total weight of the compound (Mg + 2 glycines). Much greater than elemental magnesium — to provide 200 mg of elemental magnesium, approximately 1,500-1,800 mg of total bisglycinate is needed (depending on the formulation and the verified percentage of elemental magnesium).
The time of day for the intake:
- Evening intake (with dinner or 1-2 hours before sleep) is the most used schedule when the goal is support for sleep and the nervous system, taking advantage of the mild sedative effect associated with glycine.
- Morning intake is appropriate when the goal is general supply during the day (exercise, metabolic demand). Taking it with food improves digestive tolerance.
- Split intakes (morning + night) distribute the supply when the total daily dose is high (≥300 mg).
Dietary sources, NRV and upper limit (UL)
The nutrient reference value (NRV) established by Regulation (EU) 1169/2011 on food information to consumers is 375 mg of magnesium per day for adults.
The main dietary sources of magnesium include:
- Nuts: cashews (~292 mg/100g), almonds (~270 mg/100g), Brazil nuts.
- Seeds: pumpkin seeds (~534 mg/100g, top source), sunflower seeds, chia and flax seeds.
- Whole grains: oats, quinoa, brown rice, wheat bran.
- Legumes: black beans, lentils, chickpeas.
- Dark green leafy vegetables: spinach, chard, kale.
- Cocoa and dark chocolate (≥85%): high-purity dark chocolate is a concentrated source.
- Banana: a modest contribution (~27 mg/100g) but with a strong cultural association with magnesium.
The EFSA tolerable upper limit (UL) for magnesium from food supplements is 250 mg/day. This limit reflects the risk of gastrointestinal discomfort (osmotic diarrhea) at higher doses and is independent of the magnesium provided by the diet. Important: the UL applies to magnesium from supplements, not to total dietary intake.
Safety, tolerability and contraindications
Magnesium bisglycinate has a very favorable safety profile at the usual doses in healthy adults. Owing to its chelate mechanism, it has a lower incidence of gastrointestinal discomfort than the inorganic salts (oxide, sulfate) or than citrate at high doses.
Infrequent adverse effects
- Mild gastrointestinal discomfort: uncommon with bisglycinate, more likely if 400-500 mg/day of elemental magnesium is exceeded.
- Mild hypotension in predisposed people or those treated with antihypertensives.
- Daytime drowsiness: very uncommon; glycine provides a mild sedative effect that some people perceive with high evening doses.
Contraindications
- Severe renal insufficiency: the kidney is the main route of magnesium elimination. In patients with compromised renal function (glomerular filtration rate <30 ml/min/1.73 m²) oral supplementation must be carried out exclusively under medical supervision because of the risk of hypermagnesemia.
- Advanced atrioventricular block or myasthenia gravis: magnesium may aggravate these conditions at high doses; consult the specialist.
Drug interactions
- Quinolone and tetracycline antibiotics: magnesium can form non-absorbable complexes with these antibiotics, reducing their efficacy. Space the intakes by at least 2-4 hours.
- Bisphosphonates (osteoporosis): the same absorption problem. Space by at least 2 hours.
- Loop diuretics (furosemide): they increase the urinary elimination of magnesium; additional supply may be required under supervision.
- Proton pump inhibitors (omeprazole, esomeprazole) in prolonged use: they can reduce the intestinal absorption of magnesium.
- Antihypertensives: possible potentiation of the hypotensive effect; initial monitoring recommended.
Before combining magnesium bisglycinate with any chronic medication, it is advisable to consult the doctor or pharmacist.
How to choose a magnesium supplement
- Chemical form with documented bioavailability: bisglycinate (preferred for chronic use and a focus on the nervous system/sleep), citrate (when support for intestinal transit is also sought), malate (focus on muscle energy metabolism). Avoid oxide as a supplement for systemic repletion.
- Standardization of the bisglycinate: prioritize Albion TRAACS® or other sources with structural verification of the chelate and declaration of the % of elemental magnesium.
- Dose consistent with the NRV: 200-300 mg of elemental magnesium per recommended dose covers 53-80% of the NRV (375 mg/day). Doses >400 mg/day are reserved for specific profiles under supervision.
- Avoid misleading concentrations: the labeling must differentiate the weight of the compound (total bisglycinate) and the elemental magnesium provided. If it only declares the former, it is worth verifying the actual supply using the percentage of elemental magnesium.
- Traceability and third-party certificates of analysis when available.
Magnesium bisglycinate in the Pleniage portfolio
Magnesium bisglycinate is part of the formulation of PLENIAGE® PRO CALM+ in its Albion TRAACS® form, together with Ashwagandha KSM-66 BIO, L-Theanine (without EGCG), Rhodiola at 3% rosavins and B-group vitamins (B6, B9, B12). This combination of Albion bisglycinate + adaptogens + B complex is consistent with the usage profile oriented toward the nervous system, calm and sleep quality. Each ingredient has its own individual scientific research; the specific combination in this formula has not been the subject of a dedicated clinical trial.
This page is part of the Calm and balance cluster. To explore other related ingredients further, see the Ashwagandha KSM-66 page and, for an alternative salt, the Magnesium citrate page.
Frequently asked questions about magnesium bisglycinate
What is the difference between magnesium bisglycinate and other salts?
Bisglycinate is a chelated salt in which magnesium is bound to two glycine molecules, which improves its intestinal absorption and reduces the digestive discomfort associated with other salts. Citrate has similar bioavailability but with a mild laxative effect at high doses; oxide is the cheapest form but has the lowest bioavailability and is used mainly as a laxative; sulfate (Epsom salts) has transdermal or laxative use. For chronic supplementation focused on the nervous system and sleep, bisglycinate is the preferred form.
Is any bisglycinate on the market the same?
No. Non-standardized bisglycinates may actually be physical mixtures (magnesium salt + free glycine, with no verified chelate bond), which changes the real bioavailability. The standardized reference form is Albion TRAACS® (Balchem), which subjects each batch to verification by infrared spectroscopy of the coordinate covalent bond between magnesium and glycine. Published bioavailability data on bisglycinate are not directly extrapolable to any product labeled as "bisglycinate"; it is worth verifying the declared source.
How much elemental magnesium does a dose of bisglycinate contain?
It depends on the product. The concentration of elemental magnesium in the "buffered" Albion TRAACS® bisglycinate most used in formulation is around 14%. This means that to provide 200 mg of elemental magnesium, approximately 1,500-1,800 mg of total bisglycinate is needed. The labeling must differentiate the weight of the compound and the elemental magnesium provided per recommended dose. If it only declares the former, it is worth calculating the actual supply using the product's specific percentage.
What is the best time of day to take magnesium bisglycinate?
It depends on the goal. The evening intake (with dinner or 1-2 hours before sleep) is the most used schedule when the goal is support for sleep and the nervous system, taking advantage of the mild sedative effect associated with glycine. The morning intake is appropriate when the goal is general supply during the day (exercise, metabolic demand). At high daily doses (≥300 mg) it can be split between morning + night.
Does it cause diarrhea like other magnesium salts?
Bisglycinate has a much lower incidence of gastrointestinal discomfort than oxide or sulfate and notably lower than citrate at high doses. This is due to its absorption mechanism as a chelate through peptide transporters, in parallel with the classic ionic pathway that produces the osmotic effect responsible for diarrhea with inorganic salts. For this reason bisglycinate is the preferred form for chronic supplementation at doses in the NRV range or slightly above.
Does it have contraindications?
Yes. It is contraindicated in severe renal insufficiency (glomerular filtration rate <30 ml/min/1.73 m²) because of the risk of hypermagnesemia, and it must be used under medical supervision in advanced atrioventricular block or myasthenia gravis. It has drug interactions with quinolones, tetracyclines, bisphosphonates (space by at least 2-4 hours), loop diuretics, proton pump inhibitors in prolonged use and antihypertensives. If you take chronic medication, consult your doctor before starting to supplement.
How long does it take to notice the effect of magnesium bisglycinate?
If supplementation corrects a previous deficient dietary intake, subjective improvements in sleep, calm or energy may be perceived within 2-4 weeks of continued use. If the nutritional status was already adequate, the additional supply does not produce a perceptible acute effect. Magnesium is not a stimulant: it works by replenishing an enzymatic cofactor that the body uses progressively. Persistent fatigue or sleep problems that do not improve after a month of adequate supplementation require medical consultation to rule out other causes.
Magnesium bisglycinate is one of the magnesium forms with the best oral bioavailability and the lowest incidence of digestive discomfort. The standardized Albion TRAACS® form provides structural verification of the chelate bond and traceability. Magnesium as a whole has nine physiological claims officially authorized at the European level. The choice of the specific salt (bisglycinate vs citrate vs malate vs oxide vs threonate) depends on the intended use; bisglycinate is the preferred form for chronic supplementation focused on the nervous system and sleep.
At PLENIAGE® we publish scientific content on evidence-based supplementation. You can explore the Calm and balance cluster for more related pages and articles.
References
The statements in the article are based on available scientific literature and on the official registers of health claims authorized by the EFSA at the European level.
- EFSA Health Claims Register — magnesium: authorized claims ID 238 (electrolyte balance), 239 (bones and teeth), 240 (energy-yielding metabolism), 241 (muscle function), 242 (nervous system), 244 (tiredness and fatigue), 245 (psychological function), 246 (protein synthesis), 247 (cell division). Official source: EU Register of Nutrition and Health Claims.
- Regulation (EU) 1169/2011 on food information to consumers — Annex XIII (NRV for magnesium: 375 mg/day). EFSA UL for supplements: 250 mg/day.
- Pickering G, Mazur A, Trousselard M, et al. Magnesium status and stress: the vicious circle concept revisited. Nutrients. 2020;12(12):3672. PMID: 33260549.
- Boyle NB, Lawton C, Dye L. The effects of magnesium supplementation on subjective anxiety and stress — A systematic review. Nutrients. 2017;9(5):429. PMID: 28445426.
- Schuette SA, Lashner BA, Janghorbani M. Bioavailability of magnesium diglycinate vs magnesium oxide in patients with ileal resection. JPEN J Parenter Enteral Nutr. 1994;18(5):430-435. PMID: 7815675.
- de Baaij JHF, Hoenderop JGJ, Bindels RJM. Magnesium in man: implications for health and disease. Physiol Rev. 2015;95(1):1-46. PMID: 25540137.