Jarrow Formulas L-Tryptophan 500 mg

Jarrow Formulas · Capsule · 500 mg

Price/day

€0.37

Dose

500 mg

Servings/pack

Pack price

€22.00

Transparency Index

6.9/10

Acceptable Simple amino acid pick for evening relaxation with no unnecessary extras.

Rating breakdown

Evidence for ingredient 6.0/10

L-tryptophan can moderately support sleep quality and mood; evidence is decent but not overwhelming.

Value for money 8.0/10

€0.37 per 500 mg is affordable for a tested amino acid.

Product quality 7.0/10

Jarrow uses quality-controlled pure tryptophan, encapsulated vegan with heavy metal testing.

Label honesty 8.0/10

Clear guidance on timing and interactions with sleep medications.

Third-party testing 5.0/10

No NSF certification, but internal analysis and supplier audits.

Product Description

Jarrow delivers pure L-tryptophan in 500 mg capsules. As a precursor to serotonin and melatonin, it’s commonly used in sleep contexts.

What We Like

Vegan cellulose capsules
No excipients other than rice fiber
Flexible dosing (1–3 capsules)
Established manufacturer with quality documentation

What We’re Missing

Only 500 mg — two capsules needed for a 1 g dose
No vitamin B6 or magnesium for cofactor support
Not suitable for SSRI users

Usage Recommendation

1 capsule 30–60 minutes before bed with a small carbohydrate snack. Can increase to 2–3 capsules if needed, but do not combine with antidepressants.

Other L-Tryptophan products

NOW Foods L-Tryptophan 500 mg

8.0/10

Recommended

Ingredient dossier

L-tryptophan is the precursor to serotonin and melatonin. Biologically plausible for sleep and mood, but direct supplementation effects remain limited and variable.

Read full dossier: L-Tryptophan →