J jaded New member Nov 1, 2004 #1 Longterm negative effects of ephedrine/caffeine? Does using ephedrine/caffeine stacks for long periods of time affect your thyroid, or negatively affect your metabolism in the future? Last edited: Nov 2, 2004
Longterm negative effects of ephedrine/caffeine? Does using ephedrine/caffeine stacks for long periods of time affect your thyroid, or negatively affect your metabolism in the future?