>>979102I take pic related vitamins. I've never found anything better.
During advanced training blocks I'll take Beta Alanine, seems to help short anaerobic efforts.
N-Acetyl-Tyrosine, especially on the morning of a FGR or race, along with caffeine of course. Helps with mental focus, fuels your adrenals and muscle contractions. Mock me all you like for it, but on such days, I prefer a can or two of Rockstar as my pre-race caffeine source. xD
I've also got straight powdered caffeine and a milligram-resolution scale and add 25 to 50mg of caffeine in my bike bottles, along with a little tyrosine and beta alanine.
If it's an important race I'll do a sodium phosphate loading cycle for the 4 days before the race, just for that extra few percent boost.
There's other shit I've tried in the past, but these are the ones that seem to have a positive effect.