5-HTP for Health & Longevity - Quick Reference Sheet
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5-HTP for Health & Longevity

Created on 06/18/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 4.8 – Audit

5-HTP is a serotonin-building supplement from an African seed, used for mood, sleep, and appetite. The most credible evidence shows modest sleep help in poor sleepers and a plausible but unsettled mood effect; other uses rest on small, mostly older studies. Low-cost and generally safe at low doses, though product quality and drug interactions matter. (Full Review)

Protocol

Standard Dose
50–100 mg
One hour before bed for sleep and mood support
Escalation
100–300 mg daily
Divided doses for depression or appetite control; start low to limit nausea
Best Time of Day
Evening
Leverages the serotonin-to-melatonin pathway; appetite protocols sometimes dose before meals
Time to effect
Sleep Effects
Within days
Noticeable within days
Mood Effects
2–6 weeks
Often 2–6 weeks or longer; short trials may underestimate benefit
Plasma Half-Life
2–7 hours
Short-lived; does not accumulate substantially with once-daily dosing

Benefits

Contraindications
  • MAOIs (phenelzine, selegiline, tranylcypromine)
  • Serotonergic medication
  • Carcinoid syndrome or neuroendocrine tumors
  • Bipolar disorder
  • Pregnancy or breastfeeding
  • Scheduled surgery (stop ≥2 weeks before)
    •
Key Interactions
  • SSRIs/SNRIs (sertraline, fluoxetine, venlafaxine, duloxetine)
  • Triptans (sumatriptan, rizatriptan) and tramadol
  • Dextromethorphan and St. John's Wort
  • Serotonergic supplements (L-tryptophan, SAMe, Griffonia simplicifolia)
  • Carbidopa
  • Sedatives and alcohol
    •

Risk & Side Effects

  • High: Gastrointestinal upset
    •
  • Medium: Serotonin syndrome with serotonergic combinations
    •
  • Low: Eosinophilia-myalgia syndrome; daytime drowsiness and vivid dreams / sleep disruption
    •
  • Speculative: Cardiac valve concerns from chronic peripheral serotonin; mood worsening or agitation in susceptible individuals
    •

Monitoring

Marker Target Why
Serum serotonin Mid-range, clear of upper limit Confirms biological effect; flags excess
24-hour urinary 5-HIAA Low-to-mid, well below carcinoid cutoff Screens for serotonin overproduction (carcinoid)
Eosinophil count Low-normal, ideally <0.3 ×10⁹/L Detects eosinophilia linked to historical EMS contamination concern
Vitamin B6 (pyridoxal-5-phosphate) Upper third of reference range (~40–60 nmol/L) Cofactor for converting 5-HTP to serotonin
Liver function (ALT, AST) ~10–25 U/L Baseline organ check for chronic supplement use

Cadence: Reassess at ~2 weeks (tolerability), 4–6 weeks (mood/sleep response), then every 3–6 months if use continues

Qualitative Assessment

  • Sleep quality and ease of falling asleep
  • Daytime energy and absence of morning grogginess
  • Mood stability and reduced low-mood episodes
  • Appetite and sense of fullness at meals
  • Absence of nausea, agitation, or vivid sleep-disrupting dreams
Not medical advice. Educational distillation of a single evidence review. Confirm any decision with a qualified clinician, especially in the presence of prescription drugs or chronic conditions.