It has been just a few days shy of a month, and I can already see results! I'm a very active 61 year old woman, who has been frustrated with trying to maintain muscle mass, as I'm again. After taking this, I can honestly say I see more muscle mass - in my legs, where I especially wanted it, and in my biceps and arms as well. I already take a lot of supplements, and didn't want to take additional capsules, so I'm taking the powder, nightly, before bedtime. The only thing I don't like about this product is the taste. I really have an aversion to any kind of sweetener, even Stevia, and I don't like the berry flavor at all. I would rather this have no flavor, honestly. However, I will keep taking it, because of the results, and hopefully one day you'll change the powder flavor :)