Bests & Worsts Reviews from Amazon

I'm 81 years old and have been working out with heavy weights plus walk/run on the treadmill for decades. Apparently due to my age I'm experiencing a decrease in energy, and stamina on the treadmill. I've been taking this product for about 3 weeks now. Based on the reviews here, and the apparent science behind it, I had high hopes for this product, but have been disappointed, with no enhancement in either area, nor did I experience a decrease in body fat. For me, I can check off this product as just another in a long line of snake oils. Maybe someday...a product that delivers.