Sorry brother but I strongly disagree. It's easy to tell if it's real or fake just by taking it. Headaches would make me think something else was in it. Working out with a head ache would be a pain in the ass.
I used osta in my pct which was the first time using it for me. I never felt so good in the gym during pct and I only lost 1lb of weight after gaining 12lbs. I used it for 6 weeks and I think I'm going to try a sarms cycle in a couple months to cut.