Caffiene isn&#x27;t just for fast acting, it also helps efficacy.<p><a href="http:&#x2F;&#x2F;www.evidentlycochrane.net&#x2F;caffeine-and-health-evidence-from-cochrane&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.evidentlycochrane.net&#x2F;caffeine-and-health-evidenc...</a>