5-Hydroxytryptophan (5-HTP)
Also known as: 5-HTP, oxitriptan, 5-hydroxy-L-tryptophan, griffonia simplicifolia extract
Effective Dosage
100 mg daily based on available study doses
What the Science Says
5-HTP is a naturally occurring amino acid and direct precursor to serotonin, the brain chemical involved in mood, sleep, and social behavior. Clinical trials suggest 100 mg daily may improve sleep quality — particularly in poor sleepers — and raise blood serotonin levels, with benefits appearing over 8–12 weeks. Early research also hints at modest effects on social cognition and emotion recognition, especially in older adults.
What It Doesn't Do
Not a proven antidepressant on its own — the evidence for treating clinical depression is indirect and based on its use alongside prescription drugs, not as a standalone treatment. Won't reliably cause significant weight or body composition changes. Not a replacement for sleep medication or therapy. No strong evidence it boosts muscle, energy, or athletic performance.
Evidence-Based Benefits
5-Hydroxytryptophan (5-HTP) is a naturally occurring amino acid that is a precursor to serotonin. Clinical studies suggest that it may help improve mood and alleviate symptoms of depression and anxiety, as well as aid in sleep quality.
Strong EvidenceEffective at: 100-300 mg daily
Source: auto-research
Absorption & Bioavailability
Moderate — 5-HTP crosses the blood-brain barrier and raises serum serotonin levels in clinical trials, but absorption efficiency and individual response vary. No detailed pharmacokinetic data provided in the reviewed studies.
Red Flags to Watch For
- Do NOT combine with SSRIs, SNRIs, MAOIs, or other serotonergic drugs without medical supervision — risk of serotonin syndrome
- Long-term safety data is limited; most trials are short (8–12 weeks) with small sample sizes
- Some 5-HTP supplements have historically been contaminated with peak X, a potentially harmful byproduct — source quality matters
- May cause nausea, GI discomfort, or vivid dreams, especially at higher doses
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: 2026-04-06