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

Created on 07/22/2026 – Quick Reference based on Evidence Review created using AI4L / Opus 4.8 – Audit

5-HTP is a plant-derived building block for serotonin, taken for mood, sleep, and appetite. The mood signal is real but fragile, drawn from small, dated studies; support for sleep, appetite, fibromyalgia, and headache is thinner, with no strong proof and no aging data. Stomach upset is common, and combining it with serotonin-raising medications risks dangerous serotonin excess. (Full Review)

Protocol

Starting Dose
50 mg
Titrate to 100–300 mg/day; take with food
For Sleep
Single evening dose
100–300 mg, 30–45 min before bed
For Mood / Appetite
Split dosing
2–3× daily, before meals
Time to effect
Mood
1–2 weeks
Or longer, mirroring antidepressants
Appetite
Within days
Earlier satiety, reduced intake
Sleep
First night
Sleep and calming effects

Benefits

Contraindications
  • Concurrent MAOIs (phenelzine, tranylcypromine, selegiline)
  • Pregnancy or breastfeeding
  • Prior eosinophilia-myalgia syndrome
  • Carcinoid or serotonin-secreting tumors
  • Significant heart-valve disease
  • Elective surgery (stop ≥2 weeks before)
    •
Key Interactions
  • SSRIs, SNRIs, TCAs (fluoxetine, venlafaxine, amitriptyline)
  • Triptans, serotonergic opioids (tramadol, meperidine, fentanyl)
  • Dextromethorphan, antihistamines
  • St John's Wort, L-tryptophan, SAMe
  • Carbidopa
    •

Risk & Side Effects

  • High: Gastrointestinal side effects; serotonin syndrome with serotonergic drugs
    •
  • Medium: Daytime drowsiness & sedation
    •
  • Low: Eosinophilia-myalgia syndrome
    •
  • Speculative: Cardiac valve concerns; downregulation of the body's own serotonin system
    •

Monitoring

Marker Target Why
CBC with differential (eosinophils) Eosinophils < 350 cells/µL Screens for eosinophilia-myalgia syndrome
Vitamin B6 (pyridoxal-5-phosphate) ~30–50 ng/mL Cofactor for converting 5-HTP to serotonin
Urinary 5-HIAA ~2–8 mg/24 h Reflects overall serotonin turnover
Liver enzymes (ALT, AST) ALT < 25 U/L (men), < 22 U/L (women) General safety check with chronic use
Resting heart rate & blood pressure < 120/80 mmHg; pulse 50–70 bpm Checks excess serotonergic or cardiovascular effect

Cadence: Reassess at 1–2 weeks, again at 4–6 weeks, then every 3–6 months if use continues

Qualitative Assessment

  • Frequency and depth of low mood or emotional flatness
  • Time to fall asleep, number of night awakenings, and morning grogginess
  • Dream vividness
  • Appetite, carbohydrate cravings, and early satiety at meals
  • Daytime alertness versus sedation
  • Gastrointestinal comfort (nausea, stool changes)
  • Anxiety level, watching for any paradoxical increase
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.