What is 5-HTP?
A serotonin precursor used for mood and sleep support.
5-hydroxytryptophan is a precursor to serotonin. It can support mood and sleep through serotonin production. However, it should not be combined with SSRIs or MAOIs due to serotonin syndrome risk.
What the evidence says
The overall evidence grade for 5-HTP is B (moderate — mixed or smaller trials, reasonable mechanistic support). Mechanism is clear; clinical evidence supports mood and sleep benefits with appropriate caution.
Specific findings with supporting evidence:
- Precursor to serotonin. Evidence grade A.
- May support mood. Evidence grade B.
- May improve sleep. Evidence grade B.
Best-supported outcomes:
- Mood support.
- Sleep support.
- Serotonin production.
Where marketing outpaces evidence:
- Marketing often overstates: Depression cure.
- Marketing often overstates: Safe with all medications.
Dose and timing
The typical effective dose for 5-HTP is 50–300 mg. Start low; 50-100mg typical.
Take it in the evening and bedtime. Evening for sleep; can split doses.
Who it's for, and who should skip it
Most relevant for:
- Those seeking mood support.
- People wanting serotonin support.
- Those with sleep issues.
Not appropriate for:
- Anyone on SSRIs.
- People on MAOIs.
- Those with carcinoid syndrome.
Safety and cautions
Important: Serotonin syndrome. Do NOT combine with SSRIs, MAOIs, or other serotonergics. GI effects. May cause nausea; start with low dose.
Common mistakes
- Combining with SSRIs.
- High doses without building up.
- Long-term use without breaks.
Myths vs reality
A common misconception: 5-HTP can be combined with antidepressants. In reality, this can cause dangerous serotonin syndrome.
How it interacts with other compounds
- 5-HTP works well alongside vitamin b6 — b6 needed for serotonin synthesis.
Questions people ask
Can I take it with my SSRI? No. This combination risks serotonin syndrome.
Editorial note
This guide summarizes the published evidence on 5-HTP. It is educational content, not medical advice. Confirm with your clinician if you take prescription medications or manage a chronic condition.