2 months in, and I am enjoying the benefits of this MK 677 supplement. Reading reviews before hand, I was warned of possible headaches for the first week or so, which was true in my case. 2-3 days with a very mild headache. I have had increased energy and stamina. This is really great; I gained 2 pounds after 3 days of taking it, and it really works well. very good product and very good customer service. I'm really impressed, and I'm going to recommend you guys to my buddy. I have a few guys I can refer to. I just referred somebody if I felt good with the product, and clearly I found my source now.