It will be hard to provide empirical evidence comparing oral only cycles to injectable cycles. Studies involving anabolic steroids aren't going to be approved any time soon, but especially not in humans. I think this issue comes down to conventional wisdom and experience.
Liver toxicity is a problem when it comes to a lot of pro-hormones. Check the main ingredients online. If any of them are 17 aa (17 alpha alkylated) then they are most likely hepatotoxic. For prohormones to work they have to fit specific enzymes in the body that carry hormones through the...
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