That still doesn't prove that the drugs being taken actually helped him.
He thought so. Do I need to quote Crash?
Actually, you just need to look at his stats after hitting age 35 - i.e. the period during which there is much
evidence and
testimony that he was on an expansive juicing regimen. Instead of continuing the gentle slide backwards that he was on and that age dictates, he exploded dramatically in all categories, most notably SLG and HR.
In his career, prior to the (alleged) juicing years, his SLG had never topped .700, despite his God-given hand-eye coordination. In his 30s, it barely scraped above .600. Then he went .863, .799, .749, .812 between age 36 and 39. Ignoring those 4 seasons, he posted his second highest career SLG at age 40 (.667).