Information

5-HTP is a serotonin precursor people take to help with sleep, mood, and appetite. Your body makes it naturally from tryptophan (the amino acid in turkey, eggs, oats, etc.), then converts it into serotonin, and from serotonin into melatonin. Supplementing 5-HTP gives your brain more raw material to make both.

It's most useful if you're someone who wakes up at 3 a.m. with a racing mind, struggles with low mood that gets worse in winter, or finds yourself snacking at night out of restlessness rather than hunger. It works fast (you'll feel it in 30 to 60 minutes) but it's not magic, and stacking it with other serotonergic drugs is genuinely dangerous, so the practical details below matter.

• Deep-dive

Dosage

• Standard range is 50 to 300 mg per day, taken in divided doses or as a single bedtime dose depending on goal
• For sleep, 100 to 200 mg taken 30 to 45 minutes before bed
• For mood, 50 to 100 mg two or three times daily with food
• Start at the bottom of any range for at least 3 to 5 days, nausea is the most common dose-limiting issue and almost always resolves within a week
• Take with a small amount of carbohydrate to improve CNS uptake (insulin-driven amino acid clearance helps tryptophan-family compounds cross the blood-brain barrier)
• Women generally respond to lower doses, no specific adjustment needed but most women find 50 to 150 mg sufficient
• Older adults: 100 mg/day is the dose validated in recent trials and is usually plenty
• Consider pairing with L-tyrosine (500 to 1000 mg in the morning) if running 5-HTP daily for more than a few weeks, to keep catecholamines in balance
• Cycle it: 5 days on, 2 off, or run it for 8 to 12 weeks then take a break, rather than indefinite daily use

Here's what you can expect

Most people feel something within the first hour, usually a calming, slightly sedating quality, sometimes a noticeable mood lift. For sleep, the effect is on falling asleep faster and sleeping more deeply, not on staying asleep longer (melatonin is better for that, and 5-HTP is the precursor for endogenous melatonin anyway).

For mood, expect a gradual smoothing rather than a dramatic shift. The Singapore trial showed depression scores improving by week 8. If you're using it for appetite, the satiety effect is most noticeable on carb cravings specifically, snacking patterns tend to shift before total calories do.

What 5-HTP does not do well: replace an SSRI for clinical depression, treat anxiety disorders robustly (the evidence is thin), or work indefinitely without diminishing returns. Most users find it loses some edge after 6 to 8 weeks of continuous use, which is part of why cycling makes sense.

Side effects & risks