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5-HTP (5-Hydroxytryptophan): Uses, Benefits, Dosage & Safety

Last updated: June 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy

Quick summary

5-HTP is a direct precursor to serotonin, taken for mood, sleep and appetite. It has some small supportive studies, but its serotonin activity makes it genuinely risky to combine with antidepressants and other serotonergic drugs.

What is 5-HTP (5-Hydroxytryptophan)?

5-HTP (5-hydroxytryptophan) is a compound the body makes from the amino acid tryptophan on the way to producing serotonin. Supplements are extracted from the seeds of an African plant, Griffonia simplicifolia. Because serotonin influences mood, sleep and appetite, 5-HTP is marketed for low mood, insomnia and weight/appetite control. Unlike tryptophan, it crosses into the brain readily and is converted to serotonin, which is both why it's used and why it needs real caution.

What 5-HTP (5-Hydroxytryptophan) is commonly used for

5-HTP (5-Hydroxytryptophan) is used in supplements as nutritional support, not as a treatment for any medical condition.

How 5-HTP (5-Hydroxytryptophan) works

5-HTP is converted directly into serotonin, a neurotransmitter involved in mood, sleep-wake cycles and satiety. Raising serotonin is the rationale for its use in mood and appetite. The same mechanism is the core safety problem: combined with other substances that raise serotonin — many antidepressants, migraine triptans, certain painkillers — it can push serotonin too high, risking a dangerous reaction called serotonin syndrome.

What the evidence says

Here's an honest snapshot of what published research suggests about 5-HTP (5-Hydroxytryptophan) — including where the evidence is limited.

Typical dosage used in studies

Studies have used roughly 50-300 mg/day, often split, sometimes taken at night for sleep. This is research information, not a recommendation, and its interaction risks make medical advice sensible.

Side effects and safety

The most common side effects are nausea and digestive upset, often reduced by starting low. The serious concern is serotonin syndrome when 5-HTP is stacked with other serotonin-raising drugs.

Medication interactions and who should avoid 5-HTP (5-Hydroxytryptophan)

Medication & safety check

5-HTP should not be combined with antidepressants (SSRIs, SNRIs, MAOIs), migraine triptans, tramadol or other serotonergic drugs without medical supervision, due to serotonin-syndrome risk. It is best avoided in pregnancy and breastfeeding and stopped before surgery (anaesthesia interactions). Mood problems should be managed with a professional.

This is general information, not personal medical advice. If you take any medication, confirm it's safe to combine with 5-HTP (5-Hydroxytryptophan) with your doctor or pharmacist first.

Sources & further reading

The evidence summary above is drawn from these sources. For general, authoritative background you can also consult:

Frequently asked questions

What is 5-HTP used for?

Mostly low mood, sleep and appetite, via serotonin. The supporting studies are small, and it's not a substitute for treatment of depression.

Can I take 5-HTP with an antidepressant?

Not without medical supervision — combining them can cause serotonin syndrome, a potentially dangerous reaction.

What dose is used?

Around 50-300 mg/day in studies, often started low to limit nausea.

Is 5-HTP safe?

On its own, side effects are usually mild (nausea). The real risk is combining it with other serotonin-raising drugs.

Should I use it for depression?

Depression should be managed with a professional. 5-HTP's evidence is limited and its interactions are serious.