Never used them, so I cannot vouch for them. One thing I would ask when ordering clen, what did it test at? The better peptide sites place their testing information up for the customers to review. What I am mainly looking at is, does it test at 200 mcg. I know some that sell clen at 100 mcg, but when you look at the test sheet it tests between 134-136 mcg. That is a major difference. While I would rather it be over than under, I prefer it to be accurately dosed. Especially something where the side effects increase greatly with increased dose.