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5-HTP (5-Hydroxytryptophan)
5-HTP is worth a short trial if you want sleep latency or mild mood support and you are not on any serotonergic medication, otherwise it is not safe to take.
- Evidence
- Mixed Evidence
- Category
- Sleep & Relaxation
- Best form
- Griffonia simplicifolia seed extract (95% or greater 5-HTP)
- Effective dose
- 100-300mg daily for sleep and mood support
- Lab tested
- 1 of 10 products
- Category
- Sleep & Relaxation
- Best form
- Griffonia simplicifolia seed extract (95% or greater 5-HTP)
- Effective dose
- 100-300mg daily for sleep and mood support
- Lab tested
- 1 of 10 products
Key takeaways
- →Direct serotonin precursor with moderate evidence for sleep, mood, appetite, and fibromyalgia; anxiety signal is real but most trials are small and old.
- →Take 100-300mg of Griffonia simplicifolia extract 30-45 min before bed. Start at 50mg to dodge nausea, the most common side effect.
- →Doctor's Best 100mg with B6+C ($0.15/day) is the cheapest clinical dose; Nutricost 200mg ($0.21/day) adds ISO-accredited testing.
- →Never combine with SSRIs, SNRIs, MAOIs, triptans, tramadol, or linezolid - serotonin syndrome can be fatal. Fluoxetine needs a 5-week washout.
What Is 5-HTP (5-Hydroxytryptophan)?
5-HTP is worth a short trial if you want sleep latency or mild mood support and you are not on any serotonergic medication, otherwise it is not safe to take. As a direct serotonin precursor, it crosses the blood-brain barrier more readily than tryptophan, and small trials show modest effects on sleep, mood, appetite, and fibromyalgia. The evidence is moderate but hampered by small, older studies, and combining 5-HTP with SSRIs, SNRIs, MAOIs, triptans, or tramadol can cause life-threatening serotonin syndrome.
For sleep, small studies show that 5-HTP can reduce sleep latency (by ~5-6 min in the Shell 2010 trial), increase sleep duration, and selectively increase REM sleep, which is consistent with serotonin's role in sleep regulation. The Shell trial also demonstrated increased parasympathetic heart rate variability during sleep, suggesting improved sleep quality beyond subjective reports. The findings are promising but the trials are few and small.
For mood support, reviews of the available trials suggest that 5-HTP performs better than placebo for depressive symptoms, though the evidence is insufficient to be conclusive due to small sample sizes. For appetite, trials show that 5-HTP at higher doses significantly reduces caloric intake and promotes weight loss, likely through serotonin's role in satiety signaling.
For fibromyalgia, a 1990 double-blind, placebo-controlled trial (n=50) found that 5-HTP significantly improved tender point counts, pain intensity, sleep quality, and fatigue compared to placebo. A 90-day open-label extension confirmed sustained benefits across all variables (P < 0.001). The mechanism is plausible: serotonin deficit in descending inhibitory pain pathways is a leading model for fibromyalgia's central sensitization.
For anxiety, the picture has improved. An early RCT found 5-HTP significantly less effective than clomipramine for anxiety disorders, and acute dosing may be anxiogenic in some individuals. However, Balogun et al. 2024 conducted a meta-analysis of 16 RCTs on tryptophan/5-HTP for anxiety, finding a significant overall anxiolytic effect (SMD = -0.48, P < 0.001). Heterogeneity was high and most trials were small, so the signal is real but not yet definitive.
Overall, the evidence is moderate for sleep, mood, appetite, fibromyalgia, and emerging for anxiety (supported by a 2024 meta-analysis), but hampered by small, older trials for most indications. The mechanism is well understood and plausible, but large modern studies are lacking for most claims. The critical safety concern is serotonin syndrome when combined with any serotonergic drug - published case reports document life-threatening outcomes including rhabdomyolysis requiring fasciotomy and drug-induced mania. Cyproheptadine is the standard antidote for moderate-to-severe serotonin syndrome.
Does It Work? The Evidence
How A-F grades workImproves sleep quality and reduces sleep latency
Shell et al. 2010 (PMID: 19417589): GABA/5-HTP combo reduced sleep latency by 5.7 min, increased sleep duration by 17 min, and improved sleep quality with significantly increased parasympathetic HRV during sleep in placebo-controlled RCT; Wyatt et al. 1971 (PMID: 4105646): 5-HTP selectively increased REM sleep in normal subjects with dose-dependent latency reduction
Supports mood and may reduce symptoms of depression
Shaw et al. 2002 Cochrane review (PMID: 11597653, n=63 across trials): 5-HTP appeared superior to placebo for depression; Byerley et al. 1987 (PMID: 11869656)
Promotes satiety and aids in weight loss
Cangiano et al. 1998 (PMID: 9705024, n=20): 750mg/day reduced caloric intake and body weight in obese subjects; Ceci et al. 1989 (PMID: 2468734)
Reduces fibromyalgia symptoms including pain, fatigue, and sleep disruption
Caruso et al. 1990 (PMID: 2193835, n=50): double-blind RCT showed ~50% of patients achieved clinically meaningful improvement in tender points, pain intensity, sleep quality, and fatigue vs placebo; Sarzi Puttini & Caruso 1992 (PMID: 1521674): 90-day open-label follow-up confirmed sustained benefits across all variables (P < 0.001), with improvements maintained without dose escalation
Reduces anxiety symptoms
Kahn & Westenberg 1987 (PMID: 3312397): double-blind RCT showed 5-HTP significantly less effective than clomipramine for anxiety disorders. Acute 5-HTP may be anxiogenic in some individuals due to rapid serotonin spikes
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| B | Improves sleep quality and reduces sleep latency | Shell et al. 2010 (PMID: 19417589): GABA/5-HTP combo reduced sleep latency by 5.7 min, increased sleep duration by 17 min, and improved sleep quality with significantly increased parasympathetic HRV during sleep in placebo-controlled RCT; Wyatt et al. 1971 (PMID: 4105646): 5-HTP selectively increased REM sleep in normal subjects with dose-dependent latency reduction | Early Signal |
| B | Supports mood and may reduce symptoms of depression | Shaw et al. 2002 Cochrane review (PMID: 11597653, n=63 across trials): 5-HTP appeared superior to placebo for depression; Byerley et al. 1987 (PMID: 11869656) | Early Signal |
| B | Promotes satiety and aids in weight loss | Cangiano et al. 1998 (PMID: 9705024, n=20): 750mg/day reduced caloric intake and body weight in obese subjects; Ceci et al. 1989 (PMID: 2468734) | Early Signal |
| B | Reduces fibromyalgia symptoms including pain, fatigue, and sleep disruption | Caruso et al. 1990 (PMID: 2193835, n=50): double-blind RCT showed ~50% of patients achieved clinically meaningful improvement in tender points, pain intensity, sleep quality, and fatigue vs placebo; Sarzi Puttini & Caruso 1992 (PMID: 1521674): 90-day open-label follow-up confirmed sustained benefits across all variables (P < 0.001), with improvements maintained without dose escalation | Early Signal |
| C | Reduces anxiety symptoms | Kahn & Westenberg 1987 (PMID: 3312397): double-blind RCT showed 5-HTP significantly less effective than clomipramine for anxiety disorders. Acute 5-HTP may be anxiogenic in some individuals due to rapid serotonin spikes | Early Signal |
How to Choose: Forms, Doses & What Matters
Clinical dose: 100-300mg daily for sleep and mood support; up to 900mg for appetite suppression - always start at 50mg
Best forms: Griffonia simplicifolia seed extract (95% or greater 5-HTP)
For sleep: take 100-300mg approximately 30-45 minutes before bed. For appetite suppression: take 250-300mg approximately 30 minutes before meals. Start with a low dose of 50mg to assess tolerance, as nausea is common at higher starting doses. Can be taken with or without food, though taking with a small carbohydrate snack may improve absorption.
Who Should Take 5-HTP (5-Hydroxytryptophan)?
Adults seeking short-term support for sleep latency, mild mood concerns, or appetite suppression. Those who have tried tryptophan without results may respond to 5-HTP since it bypasses the rate-limiting conversion step. Best suited for individuals not taking serotonergic medications of any kind.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
10 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 10 Products Compared
Nutricost 5-HTP 200mg
Nutricost$12.95 ÷ 62 days at 200mg/day (1 serving × 200mg)
One of the few 5-HTP products with verified third-party testing at an ISO-accredited lab
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Doctor's Best 5-HTP Enhanced with Vitamins B6 & C 100mg
Doctor's Best$18.65 ÷ 124 days at 100mg/day (1 serving × 100mg)
Includes vitamins B6 and C as cofactors for serotonin synthesis, 120-count bottle offers exceptional per-dose value
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Amazing Formulas 5-HTP 100mg
Amazing Formulas
$9.99 ÷ 125 days at 100mg/day (1 serving × 100mg)
Extremely low price point but no independent quality verification - you get what you pay for with budget supplement brands
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Best Naturals 5-HTP 200mg
Best Naturals
$16.99 ÷ 121 days at 200mg/day (1 serving × 200mg)
High 200mg dose in a large 120-count bottle offers strong value, but the absence of third-party testing is a concern
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Jarrow Formulas 5-HTP 100mg
Jarrow Formulas$26.97 ÷ 60 days at 100mg/day (1 serving × 100mg)
Reputable brand with straightforward single-ingredient formula at the standard 100mg clinical dose
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Natrol 5-HTP Time Release 100mg
Natrol
$20.40 ÷ 45 days at 100mg/day (1 serving × 100mg)
Time-release formulation may reduce nausea and provide more sustained serotonin support, though this delivery method was not used in clinical trials
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
NOW Supplements 5-HTP 50mg
NOW
$13.99 ÷ 45 days at 100mg/day (2 servings × 50mg)
Low 50mg dose is ideal for those who want to start conservatively and titrate up gradually
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Nature's Way 5-HTP 50mg
Nature's Way
$14.69 ÷ 31 days at 100mg/day (2 servings × 50mg)
Includes vitamins B6 and C as serotonin synthesis cofactors, 50mg dose allows conservative starting
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Thorne 5-Hydroxytryptophan
Thorne$39.00 ÷ 45 days at 100mg/day (2 servings × 50mg)
Includes pyridoxal-5-phosphate (active B6) as a serotonin synthesis cofactor, but the 50mg dose and premium price make this one of the most expensive options per effective dose
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Dream Water Sleep Shot
Dream Water
$26.99 ÷ Infinity days at 0mg/day (0 servings × 0mg)
A convenience product marketed for sleep that hides all ingredient doses behind a proprietary blend - severely underdosed for any meaningful 5-HTP effect
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Nutricost 5-HTP 200mg Nutricost | Doctor's Best 5-HTP Enhanced with Vitamins B6 & C 100mg Doctor's Best | Amazing Formulas 5-HTP 100mg Amazing Formulas | Best Naturals 5-HTP 200mg Best Naturals | Jarrow Formulas 5-HTP 100mg Jarrow Formulas | Natrol 5-HTP Time Release 100mg Natrol | NOW Supplements 5-HTP 50mg NOW | Nature's Way 5-HTP 50mg Nature's Way | Thorne 5-Hydroxytryptophan Thorne | Dream Water Sleep Shot Dream Water |
|---|---|---|---|---|---|---|---|---|---|---|
| Brand Score | 90/100Winner | 84/100 | 74/100 | 74/100 | 74/100 | 74/100 | 73/100 | 67/100 | 61/100 | 36/100 |
| Dosing & Form | 25/25Winner | 25/25 | 25/25 | 25/25 | 25/25 | 25/25 | 18/25 | 18/25 | 18/25 | 20/25 |
| Purity | 19/25Winner | 13/25 | 7/25 | 7/25 | 13/25 | 13/25 | 13/25 | 13/25 | 13/25 | 7/25 |
| Value | 23/25Winner | 23/25 | 23/25 | 23/25 | 13/25 | 13/25 | 19/25 | 13/25 | 7/25 | 2/25 |
| Transparency | 23/25Winner | 23/25 | 19/25 | 19/25 | 23/25 | 23/25 | 23/25 | 23/25 | 23/25 | 7/25 |
| Cost/Day | $0.21 | $0.15 | $0.08 | $0.14 | $0.45 | $0.45 | $0.31 | $0.48 | $0.86 | $0.00Winner |
| Dose/Serving | 200mg | 100mg | 100mg | 200mg | 100mg | 100mg | 50mg | 50mg | 50mg | 0mg |
| Form | Griffonia simplicifolia Seed Extract | Griffonia simplicifolia Seed Extract | Griffonia simplicifolia Seed Extract | Griffonia simplicifolia Seed Extract | Griffonia simplicifolia Seed Extract | Griffonia simplicifolia Seed Extract (Time Release) | Griffonia simplicifolia Seed Extract | Griffonia simplicifolia Seed Extract | Griffonia simplicifolia Seed Extract | Proprietary Blend (GABA, Melatonin, 5-HTP) |
| Third-Party Tested | ✓ Yes | No | No | No | No | No | No | No | No | No |
| Proprietary Blend | No | No | No | No | No | No | No | No | No | Yes |
Frequently Asked Questions
Can I take 5-HTP with an SSRI or antidepressant?
No. Combining 5-HTP with SSRIs, SNRIs, MAOIs, triptans, or other serotonergic medications creates a serious risk of serotonin syndrome. Published case reports document rhabdomyolysis requiring emergency fasciotomy from sertraline + 5-HTP (CK > 100,000 U/L), and drug-induced mania from phenelzine + 5-HTP. If switching from an SSRI to 5-HTP, a minimum 14-day washout is required for most SSRIs, and 5 weeks for fluoxetine (Prozac) due to its long-acting metabolite norfluoxetine. Paroxetine carries additional risk as a potent CYP2D6 inhibitor. Also be aware that the antibiotic linezolid and methylene blue have secondary MAOI properties that make them equally dangerous to combine with 5-HTP. If serotonin syndrome occurs, cyproheptadine is the standard pharmacologic antidote - seek emergency care immediately.
How long does it take for 5-HTP to work for sleep?
Most people notice effects on sleep latency within the first few days of use at 100-200mg taken 30-45 minutes before bed. The sleep benefits appear relatively quickly because 5-HTP is rapidly converted to serotonin and subsequently melatonin. For mood effects, 2-4 weeks of consistent use may be needed.
Is 5-HTP safe for long-term use?
Long-term safety data for 5-HTP is limited. Most clinical trials lasted 2-12 weeks. Some researchers have raised theoretical concerns about prolonged serotonin precursor supplementation depleting dopamine and other catecholamines over time. Many practitioners recommend cycling 5-HTP (e.g., 8-12 weeks on, then a break) rather than indefinite daily use.
Why do some 5-HTP products include vitamin B6?
Vitamin B6 (especially as pyridoxal-5-phosphate / P5P) is a cofactor for the enzyme aromatic L-amino acid decarboxylase, which converts 5-HTP to serotonin. Including B6 may support more efficient conversion. However, some argue that B6 could increase peripheral serotonin conversion before 5-HTP reaches the brain, potentially reducing central effects and increasing GI side effects. The evidence is inconclusive either way.
What is Peak X contamination and should I be worried?
Peak X refers to a contaminant identified in some tryptophan and 5-HTP products in the late 1980s and early 1990s, which was linked to eosinophilia-myalgia syndrome (EMS). Modern GMP manufacturing practices have largely eliminated this concern, and no cases of EMS from 5-HTP have been confirmed since the early contamination incidents. Choosing products from reputable manufacturers with GMP certification reduces any residual risk.
Can 5-HTP help with fibromyalgia symptoms?
Possibly. A 1990 double-blind trial (n=50) found 5-HTP significantly improved tender points, pain, sleep quality, and fatigue in fibromyalgia patients compared to placebo, with benefits sustained over a 90-day extension. The mechanism is plausible since serotonin deficit in descending pain pathways is a leading model for fibromyalgia. However, the evidence is limited to these older studies, and no large modern trials have followed up. It remains a reasonable adjunctive option to discuss with a physician.
Is 5-HTP or melatonin better for sleep?
They work through different mechanisms. Melatonin directly signals your body's circadian clock, while 5-HTP increases serotonin, which is then partially converted to melatonin. Melatonin has stronger and more direct evidence for sleep onset. 5-HTP may be preferable if you also want mood or appetite benefits, or if melatonin alone has not worked for you. They should not be combined without medical guidance due to additive serotonergic effects.
Related Articles
Sources
- Shell W, et al. A randomized, placebo-controlled trial of an amino acid preparation on timing and quality of sleep. Am J Ther. 2010;17(2):133-9.
- Wyatt RJ, et al. Effects of 5-hydroxytryptophan on the sleep of normal human subjects. Electroencephalogr Clin Neurophysiol. 1971;30(6):505-9.
- Shaw K, et al. Tryptophan and 5-hydroxytryptophan for depression. Cochrane Database Syst Rev. 2002;(1):CD003198.
- Byerley WF, et al. 5-Hydroxytryptophan: a review of its antidepressant efficacy and adverse effects. J Clin Psychopharmacol. 1987;7(3):127-37.
- Cangiano C, et al. Eating behavior and adherence to dietary prescriptions in obese adult subjects treated with 5-hydroxytryptophan. Int J Obes Relat Metab Disord. 1998;22(7):648-54.
- Ceci F, et al. The effects of oral 5-hydroxytryptophan administration on feeding behavior in obese adult female subjects. J Neural Transm. 1989;76(2):109-17.
- Birdsall TC. 5-Hydroxytryptophan: a clinically-effective serotonin precursor. Altern Med Rev. 1998;3(4):271-280.
- Caruso I, et al. Double-blind study of 5-hydroxytryptophan versus placebo in the treatment of primary fibromyalgia syndrome. J Int Med Res. 1990;18(3):201-9.
- Sarzi Puttini P, Caruso I. Primary fibromyalgia syndrome and 5-hydroxy-L-tryptophan: a 90-day open study. J Int Med Res. 1992;20(2):182-9.
- Kahn RS, Westenberg HG. Effect of a serotonin precursor and uptake inhibitor in anxiety disorders; a double-blind comparison of 5-hydroxytryptophan, clomipramine and placebo. Int Clin Psychopharmacol. 1987;2(1):33-45.
- Serotonin Syndrome. StatPearls. NCBI Bookshelf.
- Cangiano C, et al. Effects of oral 5-hydroxy-tryptophan on energy intake and macronutrient selection in non-insulin dependent diabetic patients. Int J Obes Relat Metab Disord. 1998;22(7):648-54.
- Boyer EW, Shannon M. The serotonin syndrome. N Engl J Med. 2005;352(11):1112-20.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.