Last verified: 17 days ago
L-Serine
Also known as: serine, L-Ser, 2-amino-3-hydroxypropanoic acid
Evidence under review. — Not yet rated
Amino acid with early evidence for rare genetic brain disorders. Limited data for general supplement use.
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What it does
L-Serine is a non-essential amino acid naturally produced by the body and found in many foods. It plays a role in producing D-serine, a molecule that activates NMDA receptors in the brain, which...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose for general use; disease-specific dosing varies
What the Science Says
L-Serine is a non-essential amino acid naturally produced by the body and found in many foods. It plays a role in producing D-serine, a molecule that activates NMDA receptors in the brain, which are critical for learning and nerve signaling. Clinical trials have explored its use in children with rare genetic disorders affecting NMDA receptor function (GRIN-related encephalopathies), where it showed improvements in adaptive behavior, motor function, and quality of life in some patients.
What It Doesn't Do
Not proven to boost memory or cognition in healthy adults. No evidence it builds muscle or aids athletic performance. No data supporting use for general anxiety, sleep, or mood in typical supplement doses. The cancer cell research is lab-only — it does not treat cancer.
Evidence-Based Benefits
Improves adaptive behavior and motor function in children with GRIN loss-of-function genetic disorders.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown from provided studies — oral absorption in pediatric trials was assumed adequate, but no pharmacokinetic data was reported in the provided abstracts.
Red Flags to Watch For
- Clinical evidence is limited to rare pediatric genetic disorders — benefits in healthy adults are unproven
- Higher doses (≥5 mM in sperm studies) showed harm, suggesting dose-dependent toxicity risk
- One patient in a GRIN trial discontinued due to irritability and insomnia
- Most provided papers are irrelevant to human supplementation (animal studies, lab research, bacterial engineering)
Products Containing L-Serine
See how L-Serine is used in these analyzed products:
Frequently Asked Questions
What does L-Serine do?
Amino acid with early evidence for rare genetic brain disorders. Limited data for general supplement use.
What is the effective dose of L-Serine?
No established dose for general use; disease-specific dosing varies
Is L-Serine safe?
Clinical evidence is limited to rare pediatric genetic disorders — benefits in healthy adults are unproven
What doesn't L-Serine do?
Not proven to boost memory or cognition in healthy adults.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25