I've been looking for a good Nitric Oxide Booster and wanted to give this one a try seeing as its about half the price of similarly packaged supplements. So far I am not disappointed, it has given me some energy while allowing for a good full pump when working out. I haven't been using it long enough to determine if it's providing any significant increase to muscle growth vs natural lifting, but will keep using it and may update this review in a couple months if I do/don't see a significant difference. The only reason I didn't give this a full 5 stars is that it has a very strong vitamin taste and gives me the "vitamin burps" which I'm definitely not a fan of, but for the price, I am willing to compromise for the sake of my wallet.