Vitamin C and E Supplementation And Insulin Sensitivity

Four Ways to Jack Up Insulin Sensitivity:

Vitamin C and E supplementation post-workout may not be a good idea.

"In this study, 40 young men exercised five days a week (50 minute sessions including cycling and circuit training) for four weeks. The addition of vitamin C and E supplementation in that group completely eliminated the beneficial insulin-sensitizing effects of exercise!

With further investigation it seems that the post-workout increase in reactive oxygen species (ROS) — which is blunted by C and E supplementation — is a necessary phenomenon for increasing insulin sensitivity. The argument for the temporal benefit of ROS post-workout is strengthened by the fact that long term antioxidant supplementation has been shown to increase insulin sensitivity."