Jarrow Formulas 5-HTP 100 mg Review

Not without your prescriber's explicit sign-off. 5-HTP is a direct serotonin precursor, and combined with an SSRI, SNRI, MAOI, triptan, tramadol, or other serotonergic drug it can cause serotonin syndrome — a serious and occasionally life-threatening reaction. Memorial Sloan Kettering and US Poison Control warn against the combination, and Drugs.com flags 5-HTP + SSRIs as 'major.' A reputable legacy brand doesn't change this one bit. If you take any antidepressant or have a medical condition, clear 5-HTP with your doctor before using it at all.

HPLC (high-performance liquid chromatography) is a lab method for confirming the identity and purity of the 5-HTP, and Jarrow notes it on the label — a nice touch of transparency that not every brand calls out. It's a genuine quality signal. Just be clear on what it is and isn't: it's a purity-verification step, not the same as full independent third-party certification (which is Thorne's, #3, distinction). It tells you the 5-HTP is what it says, which is reassuring for a single-ingredient product.

Because it's a solid generalist in a list where most picks have a sharper angle, and it gets out-competed on each axis. NOW (#1) and Doctor's Best (#2) give you 120 capsules for similar or less money (Doctor's Best adds cofactors); Pure Encapsulations (#4) beats it on hypoallergenic clean-label; Thorne (#3) beats it on certified testing. Jarrow is genuinely good — clean, Griffonia-sourced, HPLC-verified — it just doesn't win any single category, which is exactly what #9 on a strong list looks like.

No — it's single-ingredient 100 mg 5-HTP in a veg capsule, not enteric-coated and without added B6/C. If you want the conversion cofactors, Doctor's Best (#2) bundles them cheaply; if your stomach reacts to 5-HTP, Solaray's enteric coating (#6) is the targeted fix. Jarrow's angle is a clean, HPLC-verified Griffonia capsule from a trusted legacy brand — not extra features. Take it with food to reduce the chance of mild nausea.

One capsule (100 mg) daily, with food, for a few weeks before judging — the standard starting dose, which is exactly what this is. On evidence, be honest with yourself: it's real but modest. The best mood data (Shaw 2002, a Cochrane review, PMID 12169147) found a benefit signal over placebo but flagged that only 2 of 108 studies were high-quality; the appetite/weight data (Cangiano 1992/1998) is more consistent but from small studies. A trusted brand and HPLC purity guarantee what's in the capsule, not that 5-HTP will work for you — significant mood symptoms warrant a clinician.

1. [1] Shaw 2002 (Cochrane) PMID 12169147 — Tryptophan and 5-hydroxytryptophan for depression. Of 108 studies on 5-HTP/tryptophan for depression, only 2 met the quality bar; pooled they favored 5-HTP/tryptophan over placebo, but the authors stressed the evidence was insufficient. The honest anchor for the mood claim.
2. [2] Cangiano 1992 PMID 1384305 — Eating behavior and adherence to dietary prescriptions in obese adult subjects treated with 5-hydroxytryptophan. Double-blind RCT, 20 obese subjects, 5-HTP 900 mg/day: significant weight loss, reduced carbohydrate intake, early satiety. Behind the appetite/weight use case — small study, high dose.
3. [3] Cangiano 1998 PMID 9705024 — Effects of oral 5-hydroxy-tryptophan on energy intake and macronutrient selection in non-insulin dependent diabetic patients. In overweight NIDDM patients, oral 5-HTP decreased energy intake and produced weight loss. Reinforces the appetite/satiety mechanism in a second small clinical population.