Anecdotal, but I've been taking low dose myo-inositol (650mg/day for sleep) and 500mg/day IP6 (inositol hexaphosphate) for about half a decade.
Total Testosterone in my last labs was 1250.8 ng/dl (normal range 241-827). I was surprised it was so high, but sex drive is still strong at age 58 and I'm still generating copious amounts of semen with remarkable regularity.
Nothing but good things to say about both Inositol and IP6. Inositol clears my head of distracting thought-loops and sends me to sleep every night, and IP6 is my fountain of youth... Remarkable antioxidant, internal deodorant and chelator of all sorts of divalent/multivalent minerals that tend to over-accumulate as we age.
I take only low doses of these (moderation in ALL things!) and can not vouch for what effect megadosing might have.
Edited by synesthesia, 22 August 2015 - 06:19 AM.