Guide
Magnesium glycinate vs lactate: what's actually different
Magnesium lactate is chemically unrelated to blood lactate — it's magnesium bound to lactic acid. It has more direct human bioavailability data than several other forms, including a classic comparison where it outperformed oxide.
Magnesium lactate is magnesium bound to lactic acid — chemically unrelated to the lactate your muscles produce during exercise. It carries a similar elemental magnesium percentage to glycinate, and it has more direct human bioavailability data behind it than several other common forms, including a study where it outperformed oxide.
The two forms, side by side
| Magnesium glycinate | Magnesium lactate | |
|---|---|---|
| Formula | C4H8MgN2O4 | C6H10MgO6 |
| Molar mass | 172.42 g/mol (PubChem CID 84645) | 202.45 g/mol, anhydrous (PubChem CID 6536825) |
| Elemental magnesium by weight | ~11–14% | ~12% anhydrous; commercial dihydrate forms run slightly lower |
| Typically sold for | General daily supplementation | General daily supplementation; also used to fortify some foods and beverages, and in extended-release formulations |
| Most-documented result | Equivalent to oxide in one narrow patient population; not compared with lactate directly | Significantly higher bioavailability than oxide, equivalent to chloride and aspartate, in a 2001 study |
| Watch out for | Marketed as gentler than other forms, without a trial showing that | No direct trial against glycinate exists, so "better absorbed than glycinate" claims for lactate aren't demonstrated either |
What the human evidence shows
A 2001 controlled feeding study measured bioavailability of four commercial US magnesium preparations — oxide, chloride, lactate and aspartate — as the increase in urinary magnesium excretion in healthy volunteers given about 21 mEq (roughly 255 mg elemental magnesium) a day. Oxide showed relatively poor bioavailability, around 4% fractional absorption. Chloride, lactate and aspartate were all significantly higher than oxide and statistically equivalent to one another. Glycinate wasn't part of that comparison.
A 2018 pharmacokinetic trial took a different approach: it measured the absolute bioavailability of a newly developed extended-release magnesium L-lactate dihydrate caplet directly against an IV magnesium sulfate infusion — the only way to establish a true "how much actually reaches the blood" figure, since an IV dose is by definition 100% available. In healthy adults, the oral lactate caplet's absolute bioavailability was about 20% in serum when taken fasted, dropping to about 12% with food; urinary bioavailability was higher, around 38–41% regardless of food. That's one of the more rigorously measured absolute-bioavailability figures in the entire magnesium literature — most form comparisons (including the ones covering glycinate) only measure relative changes against another oral form, not against an IV reference.
No study has put lactate and glycinate in the same trial. Based on what exists, lactate has real, specific human evidence behind it; it just hasn't been tested against glycinate directly.
Our product
Electric Tiger Magnesium Glycinate provides 275 mg of elemental magnesium per three-capsule serving, from 2,500 mg of magnesium glycinate — both numbers on the panel, 30 servings a bottle, as low as $16.31 a bottle on subscription.
Questions people ask
What is the difference between magnesium glycinate and magnesium lactate?
Both carry a similar elemental magnesium percentage (glycinate ~11–14%, lactate ~12% anhydrous). Lactate has a 2001 human bioavailability study showing it beat oxide and matched chloride and aspartate, and a 2018 study measuring its absolute bioavailability against IV magnesium directly. No study has tested lactate against glycinate.
Is magnesium lactate better absorbed than glycinate?
There's no direct comparison to answer that from. Lactate has more absolute-bioavailability data (measured against an IV reference) than most magnesium forms get, but that's a different question from "better than glycinate specifically," which hasn't been tested.
Is magnesium lactate the same as the lactate my muscles produce?
No. Magnesium lactate is a mineral salt formed from magnesium and lactic acid, used in supplements and food fortification. It isn't related to the lactate your body produces during exercise, beyond sharing the same lactic-acid-derived name.
Related reading
- Magnesium glycinate vs oxide
- Types of magnesium compared
- Magnesium glycinate vs citrate
- Elemental magnesium, explained
Sources
- Firoz M, Graber M. "Bioavailability of US commercial magnesium preparations." Magnes Res. 2001;14(4):257-62. PMID 11794633.
- Dogterom P, Fu C, Legg T, Chiou YJ, Brandon S. "The absolute bioavailability and the effect of food on a new magnesium lactate dihydrate extended-release caplet in healthy subjects." Drug Dev Ind Pharm. 2018;44(9):1481-1487. PMID 29638147.
- PubChem CID 84645 (magnesium glycinate) and CID 6536825 (magnesium lactate), National Library of Medicine.
- Electric Tiger Magnesium Glycinate Supplement Facts: product page.
Sources
- Bioavailability of US commercial magnesium preparations In healthy volunteers given about 255 mg of elemental magnesium a day, magnesium aspartate was absorbed as well as chloride and lactate, and all three beat oxide. Glycinate wasn't tested in this particular study.
- The absolute bioavailability and the effect of food on a new magnesium lactate dihydrate extended-release caplet in healthy subjects A 2018 pharmacokinetic trial found a new extended-release magnesium lactate caplet had about 20% absolute bioavailability in blood when taken fasted, measured directly against IV magnesium as the reference.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
