Quick answer:
Magnesium citrate and magnesium glycinate are both well-absorbed forms of magnesium, but they differ in how they behave in the digestive system.Magnesium citrate is more commonly used when bowel regularity support is desired, while magnesium glycinate is often preferred for everyday supplementation where digestive comfort is a priority. That does not necessarily mean one form is “better” or “stronger” than the other. Rather, the two forms behave differently in the body and may suit different goals.
What’s the difference between magnesium glycinate and magnesium citrate?
Magnesium citrate is a magnesium salt of citric acid and is commonly used to support bowel regularity due to its osmotic effect in the intestine.
Magnesium glycinate (more precisely magnesium bisglycinate) is a chelated form of magnesium bound to the amino acid glycine. It is often chosen for people looking for a gentler option for long-term daily supplementation.
One practical difference between the two forms is digestive tolerance. Magnesium citrate is more likely to loosen stools, whereas magnesium glycinate is generally considered gentler on the gastrointestinal tract.
Absorption and evidence
Both magnesium citrate and magnesium glycinate are considered well-absorbed forms of magnesium.
One human study compared magnesium citrate, magnesium amino-acid chelate, and magnesium oxide in healthy adults over 60 days [1]. In that study, the organic forms outperformed magnesium oxide on bioavailability markers, with magnesium citrate showing slightly stronger absorption markers overall. However, the study did not specifically compare magnesium citrate directly with magnesium glycinate.
Despite similar absorption profiles, the two forms can behave differently in the digestive system. Magnesium citrate has a greater osmotic effect in the intestine, which is why it is commonly used to support bowel regularity. While this may be beneficial for constipation, some people may find citrate less comfortable for long-term daily supplementation, particularly at higher doses.
Magnesium glycinate supports general everyday wellbeing, nervous system support, muscle support after exercise and improvements in sleep quality. Magnesium glycinate is often preferred when digestive tolerance is a priority, as its chelated structure may contribute to a gentler gastrointestinal profile with less osmotic activity in the bowel.
More recently, a 2025 randomized placebo-controlled trial investigated magnesium bisglycinate supplementation in adults reporting poor sleep. Participants taking 250 mg elemental magnesium daily experienced modest improvements in sleep severity scores compared with placebo after four weeks [2].
Together, these findings support the use of both citrate and bisglycinate as effective supplemental magnesium forms, while also highlighting that different forms may suit different clinical or lifestyle goals.
The glycine distinction
One unique feature of magnesium bisglycinate is the presence of glycine, an amino acid involved in nervous system function. Glycine itself has been studied for sleep quality. In a small, randomized crossover trial, 3 g of glycine taken before bed improved subjective sleep quality and reduced next-day fatigue in 11 healthy adults.
A 250 mg elemental dose of magnesium bisglycinate provides approximately 1.5 g of glycine, which is below the amount used in standalone glycine studies but may still contribute to the overall formulation profile. In the 2025 randomized controlled trial, magnesium bisglycinate improved sleep severity scores compared with placebo over four weeks2. The authors noted that glycine may have contributed synergistically to the observed effects.
Magnesium citrate does not have the same glycine-related rationale, as citric acid does not play the same role in nervous system signaling.
Side-by-side comparison
|
Magnesium bisglycinate |
Magnesium citrate |
|
|
Form |
Chelated amino acid complex |
Magnesium salt of citric acid |
|
Elemental magnesium content |
~12% by weight |
~16% by weight |
|
Absorption |
High |
High |
|
Digestive tolerance |
Generally gentler |
More likely to loosen stools |
|
Laxative effect |
Minimal at typical doses |
Mild to moderate |
|
Carrier molecule |
Glycine |
Citric acid |
|
Cost per serving |
Higher |
Lower |
Which to use
Bisglycinate is the better choice when:
-
Daily long-term supplementation is the plan for general wellbeing, muscle support, and nervous system support
-
Sleep quality is the primary goal
-
You've experienced loose stools or cramping with citrate or oxide at maintenance doses
Citrate is more appropriate when:
-
You need acute support for constipation or bowel regularity
-
Cost is the constraint and you're comfortable with its GI profile
Frequently asked questions
Is magnesium glycinate better than magnesium citrate?
That depends on the goal of supplementation. Magnesium glycinate is often preferred for daily use and sleep-related goals because it tends to be gentler on the digestive system and has emerging research specifically investigating magnesium bisglycinate and sleep quality as well as for muscle support and everyday wellness. Magnesium citrate remains a well-absorbed option and is more commonly used when bowel regularity support is desired.
Does magnesium glycinate cause diarrhea?
Less commonly than citrate or oxide. The chelated form carries a lower osmotic burden, but high doses can still produce loose stools in some individuals.
What is the difference between magnesium glycinate and magnesium bisglycinate?
They refer to the same form of magnesium. “Bisglycinate” is the more chemically precise term, while “glycinate” is the simplified name more commonly used on supplement labels.
Can I take magnesium citrate and glycinate together?
Yes, both forms can generally be taken together. However, total supplemental magnesium intake should still remain within appropriate intake ranges unless otherwise advised by a healthcare professional.
References
1. 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. https://pubmed.ncbi.nlm.nih.gov/14596323/
2. 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. https://doi.org/10.2147/NSS.S524348
3. Yamadera, W., Inagawa, K., Chiba, S., Bannai, M., Takahashi, M., & Nakayama, K. (2007). Glycine ingestion improves subjective sleep quality in human volunteers, correlating with polysomnographic changes. Sleep and Biological Rhythms, 5(2), 126-131. https://doi.org/10.1111/j.1479-8425.2007.00262.x
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent disease.
