User submitted reviews
Review by Fred Z
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
Review by smitty
I used Optygen before but not the H.P. and feel even better with the H.P. than the other Optygen.
Review by Anonymous
Makes it easier on your heart rate. They also have a vitamin that helps with recovery.