Unknown: Vitex is chasteberry extract. Here's all that's known scientifically : http://nccam.Nih.Gov/health/chasteberry. The issue with warfarin is usually that an herbal contains vitamin k (vitex doesn't) or interferes with warfarin metabolism (it's not known to) - so i suspect vitex is okay, but it apparently has never been studied. To be safe, let your warfarin prescriber know you're using it.
Answered 12/4/2017
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