This is an interestign thread. I've been trying to remember to take my supplement on a regualr basis but I think I may try taking it an hour before my next hard ride and see if it helps.

Makbike - My tabs have 250mg each of C and M, and 200 of Vit D. I take 2, once a day. (500, 500, 400) No idea if that's good or bad.