Magnesium bisglycinate vs citrate: which to choose?

Two names dominate the magnesium shelf: bisglycinate and citrate. Each claims to be the superior form: yet the question is badly framed. The magnesium is identical in both: the Mg²⁺ ion released in the gut has the same biochemistry whatever its origin. What truly differs is the carrier molecule: glycine on one side, citrate on the other, each with its own biological activity. The choice plays out on the anion.

Bisglycinate and citrate: two good forms

Both are organic salts whose high water solubility drives rapid dissociation in the digestive tract. Bisglycinate chelates one magnesium atom to two glycine molecules. Magnesium citrate pairs the mineral with citric acid, a central intermediate of the Krebs cycle.

Elemental magnesium content is similar: about 16% for anhydrous citrate, about 14% for bisglycinate. The commercial battle opposes two products of the same quality class.

The anion naturally orients timing. Citrate is a direct Krebs-cycle intermediate with an alkalinising effect: properties aligned with the daytime rhythm of energy production. A measured daily dose of about 100 mg elemental magnesium fits this baseline logic.

Bisglycinate can be taken anytime, but its anion leans toward the evening: glycine is an inhibitory neurotransmitter of the central nervous system. Kawai et al. (2015) documented peripheral vasodilation and a drop in core body temperature after glycine before bedtime: two events that accompany sleep onset.

Absorption and tolerance: what the studies show

• Lindberg 1990: superior solubility and gastric absorption for citrate, dissolution independent of stomach acidity.
• Walker 2003: 46 subjects, 60 days, 300 mg/day, three forms; citrate produced the greatest rise in plasma and red-blood-cell magnesium (the real intracellular status).
• Kappeler 2017: single dose, significantly higher absorption and urinary excretion with citrate (randomised crossover).
• Schuette 1994: in ileal-resection patients, preserved diglycinate absorption via the dipeptide route; bisglycinate's central physiological argument.
• Coudray 2005: ten salts compared, slight advantage for organic over inorganic forms.

Tolerance: citrate's osmotic effect appears above ~300 mg elemental magnesium per single dose. Bisglycinate stays digestively neutral at equivalent doses: a real advantage for high-dose standalone supplementation.

What the marketing hides

"Bisglycinate" has become a standalone quality signal, detached from actual dose and composition. Three checks for any label:

• Elemental magnesium per daily dose: 500 mg of bisglycinate delivers ~70 mg elemental Mg. The useful figure is mg of Mg, never mg of salt.
• Actual chelation rate: "buffered" formulas blend bisglycinate with oxide to inflate the label; real chelate can drop to ~50%.
• Manufacturing origin: "Swiss" often refers to packaging only. Swiss made requires substantial transformation in Switzerland.

Magnesium citrate in base One

base One provides 100 mg of magnesium as citrate: a choice built on four coherent reasons.

The format. base One is an isotonic powder dissolved in a glass of water. Citrate dissolves completely and lends the drink a light acidity that suits the pomegranate note: delivering nutrition and hydration in one gesture.

Taste. Bisglycinate is markedly bitter in solution: drinkable formulas mask it with added flavours and sweeteners. base One declines that route; bisglycinate belongs naturally to capsules, where taste disappears.

The anion. Citrate is a Krebs-cycle intermediate: the mitochondrial pathway of ATP, whose every reaction requires an Mg-ATP complex. The formula's malic acid (50 mg) sits on the same pathway. Mineral coherence extends to potassium citrate (300 mg) and zinc citrate (5 mg); free citric acid (236 mg) keeps divalent cations in solution and extends the absorption window. Citrate's urinary alkalinising effect also reduces renal calcium excretion (Sebastian 1994).

B6 synergy. base One's vitamin B6 (P5P + hydrochloride) improves cellular magnesium entry via TRPM6/TRPM7 transporters: Berthelot (1991) documented reduced urinary excretion and higher red-cell accumulation under co-administration.

Magnesium contributes to normal functioning of the nervous system and muscles, to the reduction of tiredness and fatigue, to normal energy-yielding metabolism, to normal protein synthesis and to the maintenance of normal bones.

What about magnesium oxide?

Its high magnesium-by-weight explains its presence in entry-level tablets: a big number at low cost. Measured fractional absorption is 4% (Firoz & Graber 2001): the rest exerts an osmotic effect in the colon. The relevant metric remains bioavailable magnesium per dose.

When to add a dedicated form

base One covers the daily baseline at 100 mg in a matrix built for actual assimilation. A frank deficit, objectified by red-cell testing, calls for targeted additional supplementation: bisglycinate for high doses, glycerophosphate for tissue penetration, malate for muscular-fatigue profiles, threonate under study for the brain fraction. See also: when to take your vitamins and mineral antagonisms.

FAQ

Which magnesium is best?

The one whose form matches the use: citrate for a daily intake in solution, bisglycinate for high standalone doses thanks to its digestive neutrality.

When should you take magnesium?

With or just before a meal. Evening intake is popular with people whose sleep is fragmented.

Does magnesium bisglycinate upset the stomach?

Its digestive tolerance ranks among the best of all available forms, including at high doses.

David Giovenco · Micronutrition researcher · President, Académie Internationale Francophone de Médecine Orthomoléculaire et Intégrative · Founder & Formulator, nuho

Sources

Lindberg 1990, J Am Coll Nutr · Berthelot 1991, Magnes Res · Sebastian 1994, NEJM · Schuette 1994, JPEN · Firoz & Graber 2001, Magnes Res · Walker 2003, Magnes Res · Coudray 2005, Magnes Res · Barbagallo 2010, Arch Biochem Biophys · Kappeler 2017, BMC Nutr · Kawai 2015, Neuropsychopharmacology.