Source Naturals, L-Tryptophan 500mg - 60 Capsules | Helps Support Mood…

Our verdict

Source Naturals, L-Tryptophan 500mg - 60 Capsules | Helps Support… works out to $0.18 per serving of l-tryptophan, at 500mg per serving in capsule form. That puts it around the median of the 38 l-tryptophan products we can price per dose, where the typical serving costs $0.17, a Value Index of 0.9 where the median product is 1.0. One container lasts 60 days at the label dose of 1 serving a day, about $5.48 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.