Double Strength 5-HTP
Scored by the Formulate Research Team · Last reviewed July 2026
Score Breakdown
Three factors carry this score; three more are checked separately and can only take points away. Hover or tap to see what drove each one.
Ingredients per Serving
Certifications & Testing
Other Ingredients
Hypromellose, Ascorbyl Palmitate, Silicon Dioxide
Recommended Use
Suggested Usage: Take 1 capsule daily, preferably on an empty stomach at bedtime.
Warnings
Caution: For adults only. Not recommended for pregnant/nursing women. Consult physician if taking medications (especially antidepressants), or have a medical condition. May cause drowsiness and mild transient GI symptoms. Take with food in case of GI upset. Keep out of reach of children. Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced
Frequently Asked Questions
What is NOW Foods Double Strength 5-HTP's Formulate score?
NOW Foods Double Strength 5-HTP scores 84 out of 100 (grade A-) on Formulate's ingredient-level rubric: clinical evidence, dose accuracy and bioavailability carry the score, while manufacturing, transparency and safety are checked separately and can only deduct.
Is NOW Foods Double Strength 5-HTP worth it?
NOW Foods Double Strength 5-HTP scores 84/100 (grade A-). That puts it in Formulate's top tier: its ingredient doses, forms, and label transparency hold up against the clinical evidence, and it carries credible third-party testing. Formulate grades every product with the same automated rubric, so the score reflects the formula — not marketing or sponsorships.
What's in NOW Foods Double Strength 5-HTP?
Each serving contains Niacin (20 mg), Vitamin B6 (2 mg), 5-Hydroxytryptophan (200 mg), Glycine (100 mg), and more. Serving size: 1 Veg Capsule(s). 60 servings per container.
How do I take double strength 5-htp?
Suggested Usage: Take 1 capsule daily, preferably on an empty stomach at bedtime.
Who makes Double Strength 5-HTP?
Double Strength 5-HTP is made by NOW Foods. See Formulate's full grade and product lineup for NOW Foods on its brand page.
Is NOW Foods Double Strength 5-HTP third-party tested?
NOW Foods lists the following certifications and testing for this product: Vegan, Vegetarian, Gluten-Free, Dairy-Free.
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Disclosure. Formulate may earn a commission from purchases made through links on this page. Commissions never influence scores — every product is graded by the same automated rubric. This page is for educational purposes only and does not replace advice from a qualified healthcare provider.