Optygen HP by first endurance is the best most powerful adaptogen for endurance athlete's in the game. Expensive, but it can be purchased sometimes on sale.
Makes it easier on your heart rate. They also have a vitamin that helps with recovery.
Ive been using Optygen hp for several years. Really helps with my endurance.
Only wish it weren't so high priced!
Fred Z
Detroit Randonnuers member
I used Optygen before but not the H.P. and feel even better with the H.P. than the other Optygen.
