I 42 years old, 5 7 tall. 78 kgs in weight. I am training for half marathon. Though i have ran the distance earlier in 2hrs 10 min, i wish to improve on speed. I have never taken any performance enhancing drugs. However, i wish to know if there are any safe performance enhancing vitamins or drugs which i can safely take.
Asked On : Sun, 2 Sep 2012