Don't waste your money. I had these tested at a local lab, and it is mostly Methylcellulose, a pharmaceutical filler. Very little L-Arginine and essential amino acid used to metabolize protein and produce Nitric Oxide for vascular dilation and muscular gain. This product had much less than the 900mg stated on the bottle; also their "proprietary blend is almost non-existent.
I got curious when the only thing that I was getting was headaches.
When I called to cancel the account, I got a "customer service" rep who could not speak English and was hung up on several times. Total scam outfit, don't waste your money-go see your doctor.
It is total garbage!
Bottom Line: No, I would not recommend this to a friend