Source Naturals, Serene Science® 5-HTP - 100 mg - 120 Capsules

Our verdict

Source Naturals, Serene Science® 5-HTP - 100 mg - 120 Capsules works out to $0.27 per serving of 5-htp, at 100mg per serving in capsule form. That puts it around the median of the 63 5-htp products we can price per dose, where the typical serving costs $0.17, a Value Index of 0.6 where the median product is 1.0. One container lasts 120 days at the label dose of 1 serving a day, about $8.14 a month. We could not verify a third-party certification for Source Naturals in a public registry. Worked out from the current retail price as of 2026-11-13; confirm the live price on Amazon.com before buying.