I tried him out last year. And a lot of people say he's good but for me I got a lot of swelling and red welts everytime I injected. But another brand of hgh also gave me welts but I been on opti for three weeks and no welts at all so I'm gonna stick with opti for a while. Just my experience
When I 1st ventured into the online thing, i signed up over at E roids, I have seen a few reviews from people there complaining about red marks and welts. I am unsure if that stems from dimer and related protein count?? I do not know dimer and purity of Godt, but i think Opti is 0 dimer?
This below study indicates ecoli used to make HGH . This could be your problem with certain HGH , especially if quality is not up to par.
Optimization of production of recombinant human growth hormone in Escherichia coli