5-HTP
Also known as: 5-HTP (5-Hydroxytryptophan), 5-Hydroxytryptophan, Griffonia extract, Oxitriptan
Overview
Direct serotonin precursor, one step closer than tryptophan. More potent for mood and appetite but requires more caution.
Frequently Asked About 5-HTP
How much 5-HTP should I take?
When is the best time to take 5-HTP?
Should I take 5-HTP with food?
What is the best form of 5-HTP?
Does 5-HTP interact with medications?
What does 5-HTP pair well with?
Who should not take 5-HTP?
Compare Forms
4 formsDifferent chemical forms vary in absorption, side effects, and best use cases. Higher bioavailability scores indicate better absorption.
5-HTP from Griffonia simplicifolia
HIGH 95Standardized natural extract from West African seed
💡 Excellent oral absorption. Crosses BBB to convert to serotonin.
- • Natural source
- • Well-standardized
- • Most common form
- • Don't combine with SSRIs (serotonin syndrome risk)
- • GI upset in some users
📝 Take with B6 (cofactor) for best conversion. Start low — 50 mg evening — to test tolerance.
5-HTP with B6 (Pyridoxal-5-Phosphate)
HIGH 1005-HTP paired with the active B6 cofactor it needs to convert to serotonin
💡 Same as standard 5-HTP, but B6 ensures the enzymatic conversion to serotonin runs efficiently.
- • Improved conversion efficiency
- • B6 supports overall neurotransmitter synthesis
- • Slightly more expensive
- • B6 must be P-5-P form, not pyridoxine HCl
📝 Best general-purpose form. Look for 50–100 mg 5-HTP + 5–10 mg P-5-P.
Sustained-Release 5-HTP
HIGH 85Time-release format for steady serotonin support overnight
💡 Spread over 4-8 hours rather than peaking sharply.
- • Less GI upset
- • Better for sleep maintenance
- • Avoids serotonin spikes
- • More expensive
- • Lower peak — less acute mood effect
📝 Good for those who get nausea from immediate-release.
L-Tryptophan (Precursor to 5-HTP)
GOOD 70Amino acid precursor, one step before 5-HTP in the pathway
💡 Competes with other amino acids at the BBB — take on empty stomach for best uptake.
- • Gentler than 5-HTP
- • Multiple downstream uses (niacin, protein synthesis)
- • Slower acting
- • Lower conversion to serotonin
- • BBB transport is gated
📝 Good alternative if 5-HTP causes nausea. 1-2 g typical, on empty stomach.
Dosage
Cycling recommended
Depression (with supervision), sleep
Research & Studies
We haven’t curated landmark studies for 5-HTPyet — one-click into the primary literature here. PubMed (RCTs) is usually the highest-signal starting point.
Mechanism of Action
- • Directly converts to serotonin
- • Crosses blood-brain barrier
- • Bypasses rate-limiting step
Evidence Quality
Direct serotonin precursor
Safety & Contraindications
- • Serotonin syndrome
- • May deplete dopamine long-term
- • SSRIs, MAOIs
- • Carcinoid tumors
- • Nausea
- • GI upset
- • Vivid dreams
Avoid
Safe
Interactions
- • SSRIs, MAOIs, triptans - serious interaction
- • Tryptophan - don't combine
- • Consider EGCG to spare dopamine
- • No interactions
Stacking & Synergies
Buying Guide
- • Griffonia simplicifolia source
- • More potent than tryptophan
- • Cycle to prevent dopamine depletion
Top Products with 5-HTP
Highest-scored catalog products containing 5-HTP, ranked by our scoring engine.
Browse all 5-HTP products →
Related Guides
In-depth guides covering 5-HTP — protocols, comparisons, and use cases.
More in Amino Acid
Other ingredients in the Amino Acid category.
Cite this page
Formulate Research Team. (2026, June). 5-HTP — Evidence-Based Supplement Guide. Formulate Supplement Encyclopedia. https://app.formulate-health.app/learning/supplements/5-htp
Educational content based on published research and our scoring methodology. Not medical advice — consult a qualified healthcare provider before starting, stopping, or changing supplements, especially if you take medications, are pregnant, or have a medical condition.