FIRST ENDURANCEOptygen - Premium Endurance Supplement | Boost Power | Increase Performance and Endurance | Improves Oxygen Utilization| 90 Capsules

I used this product for about 45 days before my last century. On the plus side, it definitely works. I feel like it allowed me to train harder and faster than my body was naturally capable of. That might sound like a positive, but I believe it caused me to over train, and I was pretty flat for the century. When I do my next century I will most likely start using it a just a week or two before the ride.

Delivered on schedule, bubble wrapped so not to break. I have taken this product in the past and it is great. I am not racing now but I am going to take it for a few months to help my training.

great product. It works

I paid an additional $13.00 for a product advertised on the label as 40% stronger Rhodiola and the ingredients are exactly the same as the original. Don't buy this product without verifying the label as I did. So much for trusting the sellers on Amazon.

So much better than the newer Optygen HP (they really screwed up that formula!)

Relatively new to triathlons and began using this product and I can tell the difference. Will continue to order as long as I am racing or training.

I purchased this for the "new and improved" formula. I was sent the old one.Be aware!

I think it works as well as the more expensive optygenHP.