NutriStack
Glycine and L-Methionine, a synergy.
Glycine is the acceptor substrate for GNMT, a main enzyme that buffers excess methylation potential created when L-Methionine raises SAMe. Adequate glycine helps dissipate surplus methyl groups and has been reported to lower homocysteine in high-methionine or high-protein conditions. The relationship is a complementary methyl-disposal pathway rather than a risk.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
Same shape as the other 1,729 pairs in the public database.
From the interaction database
What the row says.
Every entry follows the same shape: what is happening, the mechanism, the recommendation, and the primary literature.
At a glance
- Substances
- Glycine and L-Methionine
- Pair type
- Synergy
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Supplement
- Last verified
- May 30, 2026
Synergy · Emerging evidence
Synergy
What is happening. Glycine is the acceptor substrate for GNMT, a main enzyme that buffers excess methylation potential created when L-Methionine raises SAMe. Adequate glycine helps dissipate surplus methyl groups and has been reported to lower homocysteine in high-methionine or high-protein conditions. The relationship is a complementary methyl-disposal pathway rather than a risk.
Mechanism. Excess methyl groups from S-adenosylmethionine (SAMe), the active form derived from L-Methionine, are disposed of largely by glycine N-methyltransferase (GNMT), which transfers a methyl group from SAMe to glycine, producing sarcosine and S-adenosylhomocysteine. GNMT is one of the most abundant liver enzymes and acts as a principal buffer of the cellular SAMe-to-SAH ratio. Glycine availability therefore provides a sink for surplus methyl groups generated by a methionine load, and glycine (with serine) has shown hypohomocysteinemic effects in high-methionine settings.
Recommendation. No avoidance needed; this is a supportive pairing. If using L-Methionine alongside a higher-protein or methylation-supportive regimen, ordinary dietary or supplemental glycine (commonly 3 to 5 g/day) is sufficient to support methyl-group disposal. They can be taken together or at different times of day with no required separation.
Minimum separation. None, can be taken together
Sources (2)
- Luka Z, Mudd SH, Wagner C. Glycine N-methyltransferase and regulation of S-adenosylmethionine levels. Journal of Biological Chemistry review, 2009.
- Studies reporting hypohomocysteinemic effects of glycine and serine in methionine- or high-protein-induced hyperhomocysteinemia in animal and human feeding models.
Stack Score
How this pair moves the number.
Effect on the composite score
If both Glycine and L-Methionine are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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