Testosterone has been in the news a lot lately in the United States and not in a good way. The effects of testosterone are to help build muscle and get more toned look to your body. Building body mass can help an athlete improve in sports that require strength, however use performance enhancing drugs are no legal in most sports. The methyl 1-d review is meant to boost testosterone levels and help you build muscle. I don’t know much about it, but from what I have read it looks to be safe for those wishing to benefit from its effects. But in all cases make sure you do your own research before you take any supplement and if in doubt, ask your doctor.