Amino Acid
Serine
Also known as: L-Serine
An amino acid involved in neurotransmitter production and brain cell function.
KÖGN Health grades Serine as B (Moderate evidence) and rates it 3.8 out of 5.
Last reviewed · June 2026
Primary effects
- Cognitive support
- Memory support
- Neural function
How it works
Supports synthesis of neurotransmitters and phospholipids essential for brain function.
Overview
L-Serine plays an important role in brain metabolism, contributing to the production of neurotransmitters and structural components of neurons. It is also involved in the synthesis of phosphatidylserine. While its cognitive effects are subtle, it is important for long-term neurological health and cellular function.
The evidence
Serine is studied mainly as D-serine, a co-agonist at the brain's NMDA glutamate receptors, and mostly in schizophrenia rather than healthy cognition. The trials are mixed: some show improvements in learning-related brain markers, but a large multicentre trial of low-dose D-serine found no significant cognitive benefit over placebo. (L-serine, the dietary form, is studied for different, neurological uses.)
How to dose it
D-serine schizophrenia trials used around 2 g/day as an add-on; this is a research context, not a general nootropic dose.
When to take it
Chronic.
Safety & side effects
Generally tolerated in trials; high-dose D-serine has raised theoretical kidney concerns, so trial doses are kept modest.
Who should avoid it
Discuss with a clinician before use, especially if you have kidney disease or take medication acting on glutamate/NMDA pathways. The evidence is from clinical populations, not healthy enhancement.
References
Related ingredients
Graded entries that target the same cognitive goals.
Categories
Draft — the dose, safety and evidence notes on this entry were prepared from the published literature and are pending editorial and clinical review.
Educational information, not medical advice. The evidence grade is KÖGN’s editorial assessment of published research, not a health claim. Speak to a qualified clinician before changing what you take.