Source Naturals St. Johns Wort Extract, 300 mg - 240 Tablets

Our verdict

Source Naturals St. Johns Wort Extract, 300 mg - 240 Tablets works out to $0.09 per serving of st. john's wort, at 300mg per serving in tablet form. That puts it the cheapest quarter of the 24 st. john's wort products we can price per dose, where the typical serving costs $0.12, a Value Index of 1.3 where the median product is 1.0. One container lasts 240 days at the label dose of 1 serving a day, about $2.85 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.