NutriStack
InfoSynergy
Vitamin B6
Vitamin B6 (as PLP) is a required cofactor for aromatic L-amino acid decarboxylase, which converts 5-HTP to serotonin.
Recommendation: Take B6 with 5-HTP to ensure efficient conversion to serotonin. 25-50mg B6 is sufficient.
5-HTP
Amino Acid ·Moderate evidence ·Reviewed May 2026
Direct precursor to serotonin, bypassing the rate-limiting tryptophan hydroxylase step. Effective for mood, sleep, and appetite regulation.
The bottom line
Evidence rating moderate. Most-documented uses: mood support, sleep quality, appetite control. 17 sources indexed (1987–2025), with 32 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Converted directly to serotonin (5-HT) by aromatic L-amino acid decarboxylase. Unlike tryptophan, does not require tryptophan hydroxylase and is not diverted to kynurenine pathway. Serotonin is then converted to melatonin in the pineal gland.4,14
Class
Serotonin Precursor
Found in food
Not found in food; derived from Griffonia simplicifolia seeds
Low-status signs
Not applicable; but low serotonin symptoms: depression, anxiety, insomnia, cravings
Absorption
Best on an empty stomach
Dosing
Dosing & protocol.
Common range
50–200 mg daily
Recommended form
5-HTP from Griffonia simplicifolia seed extract
Take on empty stomach for best brain uptake. Evening dosing for sleep; morning for mood.14,3
Forms
Forms & what to buy.
Ranked by evidence and value.
Immediate-Release 5-HTP Recommended
Rank 1: standard oral form with predictable absorption. Head-to-head bioavailability or pharmacokinetic evidence supports this ranking (PMID: 6966118). Often taken away from protein to reduce amino acid competition.
Time-Release 5-HTP
Rank 2: slower release, lower peak exposure. May reduce nausea for sensitive users.
Griffonia Seed Extract
Rank 3: plant extract standardized for 5-HTP content. Potency varies by standardization.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes Griffonia Seed Extract.
BudgetBest value
$4.80 /mo
$0.16 per dose
Mid
$9.60 /mo
$0.32 per dose
Premium
$19.50 /mo
$0.65 per dose
Assumes 50-200 mg/day. Vendor basis: BulkSupplements powder, NOW/iHerb capsules, Vitacost, and Life Extension; premium reflects higher per-capsule specialty pricing. Updated 2026-05-28.
From food
The same dose, as food.
How much you'd eat to match a supplemental dose.
50-200 mg 5-HTP
Not applicable as a direct whole-food equivalent.
5-HTP is not meaningfully present in common foods; it is typically extracted from Griffonia simplicifolia seeds, which are not a normal dietary food.
Goals
Goal-based dosing.
Sleep
Dose: 100 mg nightly16
Timing: 30-60 minutes before bed
Clinical dose evidence: PMID 38309227. Avoid combining with serotonergic medications unless clinician supervised.
Stress & Anxiety
Dose: 50-200 mg daily
Timing: With food, split if needed
Clinical dose evidence: PMID 31504850. Avoid combining with serotonergic medications unless clinician supervised.
Metabolic Health
Dose: 300 mg three times daily
Timing: 30 minutes before meals
Clinical dose evidence: PMID 1384305. Avoid combining with serotonergic medications unless clinician supervised.
Lab work
Markers to track.
What to test, the optimal window inside the conventional range, and how long a response takes.
Urinary 5-HIAA 5-HIAA
5-HTP raises peripheral serotonin and 5-HIAA. Effects on central serotonin and mood require enzyme cofactors and are debated.13,14
Optimal
3–7 mg/24h
Conventional
2–9 mg/24h
Responds in
Urinary 5-HIAA rises within 24 to 48 hours of dosing.
2optimal9
Avoid banana, pineapple, walnuts, tomatoes, avocado for 48 hours before a 24-hour collection because they elevate 5-HIAA falsely. Do not combine 5-HTP with SSRIs.
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
Stress / emotional eating
72% relevance
A serotonin precursor that may support satiety and reduce carbohydrate-focused appetite, though weight and eating-behavior trials are small.14,15
MetabolicEmerging evidence5-HTP capsules (50 to 100 mg before meals)
Do not combine with SSRIs, SNRIs, or other serotonergic drugs because of serotonin syndrome risk; clear it with a clinician first.
Seasonal affective / winter low mood
63% relevance
It is a direct precursor to serotonin and may support serotonergic tone relevant to mood, but human trials for seasonal mood specifically are limited.3,14
MoodEmerging evidence5-HTP (Griffonia simplicifolia extract)
Do not combine with SSRIs, SNRIs, or St. John's Wort because of serotonin syndrome risk.
Fibromyalgia support
57% relevance
5-HTP is a serotonin precursor, and because low serotonergic tone is linked to pain and sleep disturbance it may modestly support fibromyalgia symptoms.14,15
PainEmerging evidence5-HTP capsule, 50 to 100 mg in the evening
Do not combine with SSRIs, SNRIs, or other serotonergic agents without clinician oversight due to serotonin syndrome risk; use only as supportive care.
PMDD (premenstrual dysphoric disorder)
48% relevance
5-HTP is a direct serotonin precursor and may help the low-serotonin component of premenstrual mood symptoms.14
HormoneInsufficient evidence5-HTP 50 to 100 mg in the evening, often used during the luteal phase
Serotonin caution: do not combine with SSRIs, St. John's Wort, SAMe, or other serotonergic agents because of serotonin syndrome risk. Clear with your prescriber first, since PMDD is often treated with SSRIs.
Early-morning awakening (waking too early, unable to return to sleep)
42% relevance
Serotonin precursor that may support sleep maintenance and mood, relevant when early waking accompanies low mood or depression.8
SleepEmerging evidence50 to 100 mg in the evening
Serotonin caution: do not combine with SSRIs, SNRIs, MAOIs, L-Tryptophan, SAMe, or St. John's Wort without clinician guidance, due to serotonin syndrome risk. Persistent early-morning waking with low mood warrants clinician evaluation for depression.
Poor satiety and appetite control (weight management)
38% relevance
5-HTP is a serotonin precursor, and higher serotonin tone is associated with reduced appetite and carbohydrate intake.8,3
MetabolicEmerging evidence5-HTP 50 to 100 mg before meals
Serotonin caution: do not combine 5-HTP with SSRIs, other serotonergic agents, or supplements like SAMe, L-Tryptophan, or St. John's Wort without medical supervision due to serotonin syndrome risk.
Protocols
Featured in protocols.
Evidence-based stacks that include it, with the exact dose and timing each one uses.
Appetite & Craving Control Protocol
Weight ManagementOptionalEmerging evidenceBeginner$35-55/mo
Dose here
50-100 mg
Timing
Late afternoon or 30 to 60 minutes before the evening meal, start at the low end
5-HTP is a serotonin precursor, and serotonin contributes to satiety signaling, so it may help curb appetite in some individuals, though evidence is limited. SAFETY: 5-HTP is serotonergic and must not be combined with SSRIs, SNRIs, MAOIs, or other serotonergic agents without clinician oversight because of serotonin syndrome risk.14,15
Safety
Full safety detail.
Interactions
Interaction records.
ModerateCaution
Melatonin
5-HTP is a serotonin precursor, and serotonin is converted to melatonin. Taking both may lead to excessive serotonergic/melatonergic activity.
Recommendation: Generally redundant to take both. If combining, use low doses and monitor for excessive drowsiness.
DangerousContraindicated
L-Tryptophan
Both 5-HTP and L-Tryptophan increase serotonin synthesis. Combining them creates additive serotonin excess, risking serotonin syndrome.
Recommendation: Do NOT combine. Choose one serotonin precursor, not both.
DangerousContraindicated
St. John's Wort
St. John's Wort inhibits serotonin reuptake while 5-HTP floods serotonin synthesis. Combined use risks serotonin syndrome: a potentially fatal condition.
Recommendation: Do NOT combine. Both increase serotonergic activity through different mechanisms.
ModerateCaution
Rhodiola Rosea
Rhodiola has preclinical monoamine effects, while 5-HTP increases serotonin synthesis. Combined use carries a theoretical serotonin-excess risk, but direct human interaction evidence is limited.
Recommendation: Avoid self-combining Rhodiola with 5-HTP if you also use antidepressants or other serotonergic agents. If used together, keep doses conservative and stop/seek care for serotonin-toxicity symptoms.
DangerousContraindicated
SSRIs/SNRIs/MAOIs
5-HTP increases serotonin synthesis and can combine dangerously with serotonergic antidepressants or MAO inhibitors, increasing serotonin syndrome risk.
Recommendation: Do NOT combine 5-HTP with SSRIs, SNRIs, MAOIs, or other serotonergic medications unless specifically directed by the prescriber managing the medication.
DangerousContraindicated
MDMA
Taking 5-HTP with MDMA sharply increases the risk of serotonin syndrome, a potentially life-threatening state of excess serotonergic activity with agitation, high fever, rapid heart rate, muscle rigidity, and seizures.
Recommendation: Do not combine. If symptoms such as high fever, confusion, severe muscle stiffness, or rapid heartbeat develop, seek emergency medical care immediately.
ModerateCaution
Psilocybin
5-HTP increases serotonin synthesis and, combined with the serotonergic psychedelic psilocybin, raises the theoretical risk of excessive serotonergic stimulation.
Recommendation: Do not combine. Seek medical advice before using either agent if the other is in use.
ModerateCaution
L-Tyrosine
L-Tyrosine (a catecholamine precursor) and 5-HTP (a serotonin precursor) compete for the same blood-brain-barrier transporter, and unbalanced chronic dosing of one alone can deplete the neurotransmitter pool made from the other.
Recommendation: If using both for mood or sleep, balance the precursors rather than mega-dosing one, and separate intake (for example tyrosine in the morning, 5-HTP in the evening). Avoid this stack entirely if taking SSRIs, SNRIs, or MAOIs.
ModerateCaution
Black Cohosh
On their own, supplemental 5-HTP can already raise serotonin levels, and Black Cohosh has measurable serotonergic pharmacology plus at least one published case of serotonin toxicity when taken alongside serotonergic prescription drugs. Layering 5-HTP on top of Black Cohosh theoretically pushes serotonergic signaling higher. Excess serotonergic activity can present as agitation, sweating, tremor, rapid heartbeat, gastrointestinal upset, and in severe cases the cluster of features seen in serotonin syndrome.
Recommendation: Do not combine 5-HTP with Black Cohosh if you also take any SSRI, SNRI, MAOI, tramadol, triptan, or other serotonergic medication. If using both supplements alone, start 5-HTP low (for example 50 mg) and avoid stacking near full doses of both. Watch for restlessness, shivering, sweating, fast heart rate, muscle twitching, or confusion, and stop both and seek care if these appear. People with a prior serotonergic reaction should avoid the pairing.
ModerateCaution
SAMe
Both SAMe and 5-HTP independently elevate serotonin activity, so combining them stacks two pro-serotonergic mechanisms. Case literature documents treatment-emergent hypomania and a theoretical risk of serotonin excess (agitation, insomnia, tremor, GI distress, and in extreme cases serotonin syndrome) when over-the-counter SAMe and 5-HTP are used together, especially at the higher end of typical dosing (SAMe 400 to 1600 mg/day, 5-HTP 150 to 800 mg/day). The risk is amplified if any prescription serotonergic agent is also on board.
Recommendation: Do not start both supplements at full dose simultaneously. If a clinician supports using them together, introduce one at a time, start low (for example SAMe 200 to 400 mg/day and 5-HTP 50 to 100 mg/day), and titrate slowly while watching for agitation, restlessness, insomnia, racing thoughts, sweating, or tremor. Avoid the combination entirely if you take any SSRI, SNRI, MAOI, triptan, tramadol, or other serotonergic medication. Stop and seek care if signs of serotonin excess appear.
SeriousContraindicated
Sertraline
5-HTP is a direct precursor to serotonin that bypasses the rate-limiting step in serotonin synthesis. When combined with sertraline's serotonin reuptake inhibition, 5-HTP can cause excessive serotonin accumulation and potentially trigger serotonin syndrome.
Recommendation: Do not combine 5-HTP with sertraline. The risk of serotonin syndrome is significant. If you are taking 5-HTP, inform your prescriber before starting any SSRI.
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
2- 1Effects of 5-hydroxytryptophan on distinct types of depression: a systematic review and meta-analysisNeeds reviewPMIDJavelle F et al. · Nutr Rev · 2020
Meta-analysis of 7 studies showed depression remission rate of 0.65 (95% CI: 0.55-0.78) with large effect size (Hedges g = 1.11).
- 2Tryptophan and 5-hydroxytryptophan for depressionNeeds reviewPMIDShaw K et al. · Cochrane Database Syst Rev · 2002
5-HTP and tryptophan were better than placebo at alleviating depression (Peto OR = 4.1), though small study sizes limit conclusions.
Randomized controlled trials
8- 3The Impact of 5-Hydroxytryptophan Supplementation on Cognitive Function and Mood in Singapore Older Adults: A Randomized Controlled TrialNeeds reviewPMIDLi S, Sutanto CN, Xia X et al. · Nutrients · 2025
Li S, Sutanto CN, Xia X et al.. The Impact of 5-Hydroxytryptophan Supplementation on Cognitive Function and Mood in Singapore Older Adults: A Randomized Controlled Trial. Nutrients. 2025
- 4Intravenous infusion of 5-hydroxytryptophan to mid-lactation Holstein cows transiently affects milk production and circulating amino acid concentrationsNeeds reviewPMIDPszczolkowski VL, Connelly MK, Hoppman A et al. · Journal of dairy science · 2024
Pszczolkowski VL, Connelly MK, Hoppman A et al.. Intravenous infusion of 5-hydroxytryptophan to mid-lactation Holstein cows transiently affects milk production and circulating amino acid concentrations. Journal of dairy science. 2024
- 5The Effects of 5-HTP on Body Composition: An 8-Week Preliminary RCTNeeds reviewPMIDMeloni M et al. · Int J Environ Res Public Health · 2022
Fat mass decreased significantly in 5-HTP group (p=0.02) but not placebo, with significant between-group differences (p=0.048).
- 6Tryptophan-enriched diet or 5-hydroxytryptophan supplementation given in a randomized controlled trial impacts social cognition on a neural and behavioral levelNeeds reviewPMIDZamoscik V, Schmidt SNL, Bravo R et al. · Scientific reports · 2021
Zamoscik V, Schmidt SNL, Bravo R et al.. Tryptophan-enriched diet or 5-hydroxytryptophan supplementation given in a randomized controlled trial impacts social cognition on a neural and behavioral level. Scientific reports. 2021
- 7Placebo-controlled comparison of three dose-regimens of 5-hydroxytryptophan challenge test in healthy volunteersNeeds reviewPMIDGijsman HJ, van Gerven JM, de Kam ML et al. · Journal of clinical psychopharmacology · 2002
Gijsman HJ, van Gerven JM, de Kam ML et al.. Placebo-controlled comparison of three dose-regimens of 5-hydroxytryptophan challenge test in healthy volunteers. Journal of clinical psychopharmacology. 2002
- 8Eating behavior and adherence to dietary prescriptions in obese adult subjects treated with 5-hydroxytryptophanNeeds reviewPMIDCangiano C et al. · Am J Clin Nutr · 1992
Double-blind RCT in 20 obese patients: 5-HTP (900 mg/d) produced significant weight loss with reduced carbohydrate intake and early satiety.
- 9Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndromeSource linkedPMIDCaruso I, Sarzi Puttini P, Cazzola M, Azzolini V · J Int Med Res · 1990
- 105-Hydroxytryptophan: a review of its antidepressant efficacy and adverse effectsNeeds reviewPMIDByerley WF, Judd LL, Reimherr FW et al. · Journal of clinical psychopharmacology · 1987
Byerley WF, Judd LL, Reimherr FW et al.. 5-Hydroxytryptophan: a review of its antidepressant efficacy and adverse effects. Journal of clinical psychopharmacology. 1987
Reviews & position papers
5- 11Detection of melatonin and 5-HTP in dietary supplements based on multiple spectraNeeds reviewPMIDYang H, Zhang X, Gao Y et al. · Frontiers in nutrition · 2025
Yang H, Zhang X, Gao Y et al.. Detection of melatonin and 5-HTP in dietary supplements based on multiple spectra. Frontiers in nutrition. 2025
- 125-Hydroxytryptophan toxicity successfully treated by haemodialysis in a dogNeeds reviewPMIDArbona DV, Cowgill LD, Press S et al. · Veterinary medicine and science · 2023
Arbona DV, Cowgill LD, Press S et al.. 5-Hydroxytryptophan toxicity successfully treated by haemodialysis in a dog. Veterinary medicine and science. 2023
- 135-HTP efficacy and contraindicationsNeeds reviewPMIDBirdsall TC · Altern Med Rev · 2012
Comprehensive review of 5-HTP safety including emphasis on serotonin syndrome risk with SSRIs and eosinophilia myalgia syndrome concerns.
- 14Serotonin a la carte: supplementation with the serotonin precursor 5-hydroxytryptophanNeeds reviewPMIDTurner EH et al. · Pharmacol Ther · 2006
5-HTP bypasses the rate-limiting tryptophan hydroxylase step to directly increase serotonin; relatively few adverse effects at therapeutic doses.
- 155-Hydroxytryptophan: a clinically-effective serotonin precursorSource linkedPMIDBirdsall TC · Alternative medicine review : a journal of clinical therapeutic · 1998
Reference material
2- 16Sutanto CN, Xia X, Heng CW et al.. The impact of 5-hydroxytryptophan supplementation on sleep quality and gut microbiota composition in older adults: A randomized controlled trial. Clinical nutrition (Edinburgh, Scotland). 2024Source linkedPMID
- 17Truyens M, Lobatón T, Ferrante M et al.. Effect of 5-Hydroxytryptophan on Fatigue in Quiescent Inflammatory Bowel Disease: A Randomized Controlled Trial. Gastroenterology. 2022Source linkedPMID
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
5-HTP in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.