The side effects of testosterone is usually dose dependent and the time period you stay on for. The side effects are well known and documented by now and we can discuss this at great length. Its become a bit of a boring topic to discuss and repeated in every article you read on testosterones. But lets mention them in summery. The list is as follows – aromatizing in the body to estradiol (estrogen) that can cause water retention, body fat gain and gynocomastia. You can combine an anti-estrogen like Nolvadex or Clomid to generally take care of most of these side effects. These anti estrogens can be alternated with a more effective aromatize inhibitor like Arimadex but only as an alternative and not for continues use (see the article under Sustanon to study the cholesterol and cardiovascular issues with aromatizing inhibitors). Oily Skin, acne and body/facial hair growth in men and woman is evident but also dose related and varies from individual to individual. Males who have a genetic predisposition to hair loss may experience accelerated male pattern balding. Testosterone does not have hepatotoxic effects and liver toxicity is unlikely.