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L-Serine
Precursor to phosphatidylserine, glycine, and D-serine — studied at high doses for neuroprotection in ALS and myelin formation.
What the evidence says
L-Serine appears to help in 6 of 6 studies with measurable effects — the evidence leans clearly favourable.
Most evidence is from high-quality meta-analyses and randomised trials published 2011–2026 with a typical study size of 46 participants.
Based on 18 studies · 1 meta-analysis · 11 RCTs · 2,625 total participants
Confidence
HighWhat the studies found
By outcome
L-Serine has an evidence score of 8.5/10 — very strong evidence based on 18 indexed studies, including 2 meta-analyses. Precursor to phosphatidylserine, glycine, and D-serine — studied at high doses for neuroprotection in ALS and myelin formation.
The commonly studied dose of L-Serine is 3-15g daily (higher for neurological conditions). Research points to an estimated optimal dose around 9g, with a minimum effective dose near 3g. Individual response varies — start low and adjust.
Timing is flexible for L-Serine — consistent daily use matters more than the time of day. L-serine is a non-essential amino acid that serves as a precursor to glycine, cysteine, phosphatidylserine, sphingolipids, and D-serine (an NMDA receptor co-agonist).
L-Theanine
Likely helpsTea-derived amino acid that boosts alpha brain waves for calm, focused alertness — synergizes with caffeine to reduce jitteriness.
Taurine
Likely helpsConcentrated in heart, brain, and muscle — emerging longevity data alongside proven benefits for sleep, cardiovascular function, and recovery.
Last reviewed May 2026 · evidence from 39 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
L-Serine is a non-essential amino acid that plays crucial roles in the central nervous system. It's a precursor to phosphatidylserine, glycine, cysteine, and D-serine (an NMDA receptor co-agonist). Research has shown interest in high-dose L-serine for neurodegenerative conditions like ALS, where it may slow disease progression. It's also important for myelin formation and overall brain health.
Required for PS synthesis
Precursor to NMDA co-agonist
Required for myelin synthesis
How L-Serine works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
3-15g daily (higher for neurological conditions)
Loading: ALS studies use 15-30g/day in divided doses
Can be taken without food
| Form | Type |
|---|---|
| 🧪L-Serine powder | Recommended |
| 💊L-Serine capsules | Alternative |
Powder is more practical for higher doses. Has mild sweet taste and dissolves in water.
Minimum: 8 weeks
Optimal: 24 weeks
Cycling: Not required
Note: Higher doses for neurological conditions should be supervised. Can be taken any time; some take before bed for glycine conversion.
Based on single RCT (n=160) showing sleep improvement with various supplements including L-serine. Conservative estimates given limited direct evidence and lack of dose-specific data for L-serine alone. Effect likely mediated through conversion to glycine.
Support for cognitive function and brain health
Potential protection of nerve cells
May improve sleep quality (converts to glycine)
High-dose L-serine is being studied; work with neurologist
May influence D-serine levels which affect NMDA receptors; consult neurologist
L-serine converts to D-serine, an NMDA co-agonist; inform healthcare provider
Tip: Divide into smaller doses; take with food
L-Serine is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are GI upset. Use caution if any of these apply to you: Known allergy or hypersensitivity to L-Serine or related compounds.
Creatine
Likely helpsIncreases phosphocreatine stores for faster ATP regeneration, boosting strength, power output, and cognitive function under stress.
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