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5-HTP (5-Hydroxytryptophan)
Clinical dose: 100-300mg daily for sleep and mood support, up to 900mg daily for appetite suppression (start low at 50mg)
At a Glance
5-HTP is the immediate biosynthetic precursor to serotonin (5-hydroxytryptamine), crossing the blood-brain barrier more readily than tryptophan. Because it bypasses the rate-limiting tryptophan hydroxylase step, oral 5-HTP supplementation can directly increase central serotonin availability. Our top pick is Nutricost 5-HTP 200mg (Grade: B+, $0.21/day).
Quick Picks
What Is 5-HTP (5-Hydroxytryptophan)?
5-HTP is the immediate biosynthetic precursor to serotonin (5-hydroxytryptamine), crossing the blood-brain barrier more readily than tryptophan. Because it bypasses the rate-limiting tryptophan hydroxylase step, oral 5-HTP supplementation can directly increase central serotonin availability. The clinical evidence is moderate but limited by small trial sizes and older study designs. For sleep, a small study by Shell et al. (PMID: 15146330, n=18) found that a GABA/5-HTP combination reduced sleep latency by 19.1 minutes and increased sleep duration compared to placebo. Earlier work by Wyatt et al. (PMID: 9727088) demonstrated that 5-HTP selectively increased REM sleep, consistent with serotonin's role in sleep architecture. These findings are promising but the trials are small and few in number, and the Shell study used a combination product rather than 5-HTP alone. For mood support, a Cochrane-adjacent review by Shaw et al. (PMID: 11597653) examined available RCTs of 5-HTP for depression and concluded that 5-HTP appeared superior to placebo in the studies reviewed, though the authors noted that the evidence was insufficient to be conclusive due to small sample sizes and methodological limitations. Byerley et al. (PMID: 11869656) reported similar modest findings. For appetite and weight management, Cangiano et al. (PMID: 9705024, n=20) found that 5-HTP at 750mg daily significantly reduced caloric intake and promoted weight loss in obese subjects, and an earlier trial (PMID: 2468734) confirmed satiety-promoting effects. Overall, the evidence is moderate across all three claims but hampered by small, older trials.
Does It Work? The Evidence
| Claimed Benefit | Evidence Level | Key Studies | Our Verdict |
|---|---|---|---|
| Improves sleep quality and reduces sleep latency | Moderate | Shell et al. 2010 (PMID: 15146330, n=18): GABA/5-HTP combo reduced sleep latency by 19.1 min; Wyatt et al. 1998 (PMID: 9727088): 5-HTP selectively increased REM sleep | Promising |
| Supports mood and may reduce symptoms of depression | Moderate | 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) | Promising |
| Promotes satiety and aids in weight loss | Moderate | 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) | Promising |
How to Choose: Forms, Doses & What Matters
Clinical dose: 100-300mg daily for sleep and mood support, up to 900mg daily for appetite suppression (start low 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.
The Scorecard: 10 Products Compared
Nutricost 5-HTP 200mg
NutricostOne of the few 5-HTP products with verified third-party testing at an ISO-accredited lab
Standard Griffonia simplicifolia extract at 200mg per capsule, matching forms used in clinical research
Manufactured in an ISO-accredited facility with third-party testing, a step above most 5-HTP products
$0.21/day at clinical dose - excellent value with verified testing
Full ingredient disclosure, no proprietary blends, form and source clearly identified
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 BestIncludes vitamins B6 and C as cofactors for serotonin synthesis, 120-count bottle offers exceptional per-dose value
100mg per capsule requires 1-3 capsules for clinical dose range, includes cofactors B6 and C
GMP certified facility but no independent third-party product testing verified
$0.15/day - the lowest cost per effective dose in this category
Full disclosure of all ingredients including cofactor doses, no proprietary blends
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Amazing Formulas 5-HTP 100mg
Amazing Formulas
Extremely low price point but no independent quality verification - you get what you pay for with budget supplement brands
Standard 100mg dose from Griffonia simplicifolia, matching common clinical protocols
Budget brand with no third-party testing verified and limited quality transparency
$0.08/day - the absolute cheapest per effective dose, though quality verification is lacking
Basic label information provided but less detail on sourcing and manufacturing than premium brands
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Best Naturals 5-HTP 200mg
Best Naturals
High 200mg dose in a large 120-count bottle offers strong value, but the absence of third-party testing is a concern
200mg per capsule delivers clinical dose in a single capsule
No third-party testing verified, limited manufacturing transparency for a lesser-known brand
$0.14/day - very affordable at 200mg per capsule from a 120-count bottle
Basic ingredient disclosure but limited detail on extract standardization and sourcing
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
NOW Supplements 5-HTP 50mg
NOW
Low 50mg dose is ideal for those who want to start conservatively and titrate up gradually
50mg per capsule allows flexible dosing but requires 2-6 capsules to reach clinical range
NOW operates GMP-certified facilities but this specific product lacks independent third-party certification
$0.31/day at effective dose - good value from a reputable brand
Clean label with full ingredient disclosure, single active ingredient, no fillers of concern
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Jarrow Formulas 5-HTP 100mg
Jarrow FormulasReputable brand with straightforward single-ingredient formula at the standard 100mg clinical dose
100mg per capsule aligns with the lower end of clinical dosing for sleep and mood
Established supplement brand with GMP certification but no external third-party testing verified
$0.45/day at clinical dose - mid-range pricing
Full ingredient transparency, single-ingredient formula, no proprietary blends
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Natrol 5-HTP Time Release 100mg
Natrol
Time-release formulation may reduce nausea and provide more sustained serotonin support, though this delivery method was not used in clinical trials
100mg time-release format, though clinical trials did not use time-release delivery
GMP certified but no independent third-party testing verified for this product
$0.45/day at clinical dose - mid-range, smaller bottle means higher per-dose cost
Full label disclosure, time-release mechanism clearly stated, no proprietary blends
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
Includes vitamins B6 and C as serotonin synthesis cofactors, 50mg dose allows conservative starting
50mg dose with added B6 and vitamin C as cofactors for serotonin synthesis
GMP certified facility, long-established brand, but no independent third-party product testing
$0.48/day - slightly above median due to lower per-capsule dose requiring more capsules
Full disclosure of all ingredients and cofactor doses, no proprietary blends
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Thorne 5-Hydroxytryptophan
ThorneIncludes 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
50mg per capsule with added pyridoxal-5-phosphate (P5P), requiring 2-6 capsules for clinical dose
Thorne is a well-regarded brand but this product lacks external third-party certification (USP, NSF, ConsumerLab)
$0.86/day - premium pricing driven by the Thorne brand name and low 50mg per-capsule dose
Excellent label transparency including specific B6 form (P5P), no proprietary blends, full ingredient disclosure
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Dream Water Sleep Shot
Dream Water
A convenience product marketed for sleep that hides all ingredient doses behind a proprietary blend - severely underdosed for any meaningful 5-HTP effect
Proprietary blend of GABA, melatonin, and 5-HTP with no individual ingredient doses disclosed - impossible to assess clinical relevance
No third-party testing verified, convenience product format with undisclosed ingredient amounts
Cannot calculate meaningful cost per effective dose - the 5-HTP content is almost certainly far below clinical thresholds
Proprietary blend hides all individual ingredient amounts, making informed dosing decisions impossible
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 | NOW Supplements 5-HTP 50mg NOW | Jarrow Formulas 5-HTP 100mg Jarrow Formulas | Natrol 5-HTP Time Release 100mg Natrol | Nature's Way 5-HTP 50mg Nature's Way | Thorne 5-Hydroxytryptophan Thorne | Dream Water Sleep Shot Dream Water |
|---|---|---|---|---|---|---|---|---|---|---|
| Overall | B+ | B | B- | B- | B- | B- | B- | B- | C+ | D- |
| Evidence | C | C | C | C | C | C | C | C | C | F |
| Quality & Purity | B | C | D | D | C | C | C | C | C | D |
| Value | A | A | A | A | B | C | C | C | D | F |
| Transparency | A | A | B | B | A | A | A | A | A | D |
| Cost/Day | $0.21 | $0.15 | $0.08 | $0.14 | $0.31 | $0.45 | $0.45 | $0.48 | $0.86 | $0.00Winner |
| Dose/Serving | 200mg | 100mg | 100mg | 200mg | 50mg | 100mg | 100mg | 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 | Griffonia simplicifolia Seed Extract (Time Release) | 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 |
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?
Anyone taking SSRIs, SNRIs, MAOIs, triptans, tramadol, dextromethorphan, or other serotonergic drugs due to serious risk of serotonin syndrome. Individuals with carcinoid tumors (5-HTP can be converted to serotonin peripherally, worsening symptoms). Pregnant or nursing women due to insufficient safety data. Those taking sedatives or anti-anxiety medications should consult a physician first.
Side Effects & Safety
Nausea is very common, particularly at doses above 100mg, and is the most frequently reported side effect. Other gastrointestinal symptoms include diarrhea, vomiting, and heartburn. Drowsiness may occur, which can be beneficial for sleep use but problematic during the day. The most serious risk is serotonin syndrome when combined with serotonergic drugs - this is a potentially life-threatening condition. Historically, there were concerns about Peak X contamination in tryptophan-related products, though modern manufacturing has largely addressed this. The upper tolerable intake is approximately 900mg/day in research settings.
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, a potentially life-threatening condition involving agitation, confusion, rapid heart rate, and high blood pressure. Do not combine these without explicit guidance from your prescribing physician.
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.
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.
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. Am J Clin Nutr. 1992;56(5):863-7.
- 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.
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.