The only thing I've noticed is some bloat and my muscles look fuller-probably from the bloat. Other than that, I haven't noticed anything. No real negative side effects. From my understanding, the benefits start to kick in after about 3 months. I'm going with grey tops for the duration of my cycle because of the purity. Had I known about the greys all along I would of only done them.
I started out on angrtropin for a month 100iu total then switched to the blacks. When I first started on the angtropin I was super lethargic but it got better after about 3 weeks. I was on the blacks for about 1 week after finishing the angtropin and got blood work. My igf-1 was at 415. Batch 32 of the blacks. I don't know if you can conclude much from that given I was only on the blacks for a week.