5-HTP ： Appetite Control

C エビデンス小規模研究からのエビデンスは限られていますが、いくつかの肯定的なシグナルがあります。

Double-blind RCT (n=20) found 750 mg/day reduced caloric intake by 38% and produced greater weight loss (1.5 kg vs. +0.2 kg placebo) over 5 weeks. A 12-week crossover trial confirmed reduced carbohydrate and fat intake at 900 mg/day. Sample sizes are small but findings are mechanistically consistent.

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結論

Key Study Findings

Animal Study

Promotion of sleep by cinnamic acid in parachlorophenylalanine-induced insomnia in rats.

Dose: Cinnamic acid (CA) administered to rats (dose not specified) vs: Placebo 効果: None None

In Vitro

Enhanced production of 5-hydroxytryptophan through the regulation of L-tryptophan biosynthetic pathway.

Dose: recombinant E. coli strain for 5-HTP biosynthesis (engineered pathway) vs: Placebo 効果: 5-HTP production increased to 1.61 g/L (24% improvement); residual L-trp reduced from 1.66 to 0.2 g/ None

In Vitro

Engineering bacterial phenylalanine 4-hydroxylase for microbial synthesis of human neurotransmitter precursor 5-hydroxytryptophan.

Dose: engineered phenylalanine 4-hydroxylase in E. coli; whole-cell bioconversion from tryptophan vs: Placebo 効果: 1.1-1.2 g/L 5-HTP production from tryptophan in shake flasks

Observational Study

Both stimulatory and inhibitory effects of dietary 5-hydroxytryptophan and tyrosine are found on urinary excretion …

Dose: 5-hydroxytryptophan (5-HTP) and tyrosine (dietary administration, various doses) vs: Placebo 効果: 5-HTP showed marginal stimulatory influence on urinary serotonin; tyrosine primarily yielded unexpec None

Key Statistics

研究数

100

参加者数

↑

Positive

グレード

Referenced Papers

Promotion of sleep by cinnamic acid in parachlorophenylalanine-induced insomnia in rats. Other

International immunopharmacology 2025 1 件の引用

Enhanced production of 5-hydroxytryptophan through the regulation of L-tryptophan biosynthetic pathway. Other

Applied microbiology and … 2020 30 件の引用

Engineering bacterial phenylalanine 4-hydroxylase for microbial synthesis of human neurotransmitter precursor 5-hydroxytryptophan. Other

ACS synthetic biology 2014 71 件の引用

Both stimulatory and inhibitory effects of dietary 5-hydroxytryptophan and tyrosine are found on urinary excretion of serotonin and dopamine in … Other

Neuropsychiatric disease and … 2009 31 件の引用

5-Hydroxytryptophan: a clinically-effective serotonin precursor. Review

Alternative medicine review … 1998 216 件の引用

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

一般的な使用量

general:: 50-100 mg 1-3x/day
starting:: 50 mg/day and titrate up
appetitecontrol:: 250-300 mg/day 30 min before meals

上限量： 500 mg/day; avoid combining with SSRIs, SNRIs, MAOIs, or triptans (serotonin syndrome risk)

研究で検討された用量

用量	期間	効果	N
Cinnamic acid (CA) administered to rats (dose not specified)	--	Positive	--
recombinant E. coli strain for 5-HTP biosynthesis (engineered pathway)	--	Positive	--
engineered phenylalanine 4-hydroxylase in E. coli; whole-cell bioconversion from tryptophan	--	Positive	--
5-hydroxytryptophan (5-HTP) and tyrosine (dietary administration, various doses)	--	Mixed	--

推奨摂取タイミング： 30 minutes before meals on an empty stomach

Safety & Side Effects

報告されている副作用

⚠ Nausea
⚠ Drowsiness
⚠ GI discomfort
⚠ Serotonin syndrome risk with contraindicated medications

既知の相互作用

● SSRIs (serotonin syndrome risk — NEVER combine)
● SNRIs (serotonin syndrome risk — NEVER combine)
● MAOIs (serotonin syndrome risk — NEVER combine)
● Triptans (serotonin syndrome risk)
● Carbidopa

耐容上限摂取量： 500 mg/day; avoid combining with SSRIs, SNRIs, MAOIs, or triptans (serotonin syndrome risk)

サプリメントの摂取を開始する前に、必ず医療専門家にご相談ください。

Frequently Asked Questions

Does 5-HTP help with Appetite Control?

Based on 4 studies with 100 participants, there is limited but promising evidence that 5-HTP may support Appetite Control management. Our evidence grade is C (Some Evidence).

How much 5-HTP should I take for Appetite Control?

Studies have used various dosages. A commonly studied range is 50-100 mg 1-3x/day. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of 5-HTP?

Reported side effects may include Nausea, Drowsiness, GI discomfort, Serotonin syndrome risk with contraindicated medications. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

How strong is the evidence for 5-HTP and Appetite Control?

We rate the evidence as Grade C (Some Evidence). This rating is based on 4 peer-reviewed studies with 100 total participants. The overall direction of effect is positive.

に関する他の成分： Appetite Control

Glucomannan A Prebiotics/Inulin B Whey Protein B Hoodia D

5-HTP 他の症状・状態について

Emotional Eating C

総合評価

Double-blind RCT (n=20) found 750 mg/day reduced caloric intake by 38% and produced greater weight loss (1.5 kg vs. +0.2 kg placebo) over 5 weeks. A 12-week crossover trial confirmed …

Evidence Strength52%

Moderate confidence

研究の内訳

RCT (0)Meta (0)Other (4)

代替成分との比較

この症状に対する他の成分との比較をご覧ください。

に関するすべての成分を見る： Appetite Control

詳しく見る

References

[1] Xiaona Ye et al.. Int Immunopharmacol. 2025. Promotion of sleep by cinnamic acid in parachlorophenylalanine-induced insomnia in rats. doi:10.1016/j.intimp.2025.114852 PubMed
[2] Da Xu et al.. Appl Microbiol Biotechnol. 2020. Enhanced production of 5-hydroxytryptophan through the regulation of L-tryptophan biosynthetic pathway. doi:10.1007/s00253-020-10371-y PubMed
[3] Yuheng Lin et al.. ACS Synth Biol. 2014. Engineering bacterial phenylalanine 4-hydroxylase for microbial synthesis of human neurotransmitter precursor 5-hydroxytryptophan. doi:10.1021/sb5002505 PubMed
[4] George J Trachte et al.. Neuropsychiatr Dis Treat. 2009. Both stimulatory and inhibitory effects of dietary 5-hydroxytryptophan and tyrosine are found on urinary excretion of serotonin and dopamine in … doi:10.2147/ndt.s5040 PubMed
[5] T C Birdsall. Altern Med Rev. 1998. 5-Hydroxytryptophan: a clinically-effective serotonin precursor. PubMed

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