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R 41 is selected from the group consisting of optionally substituted alkyl, optionally substituted alkylamino, optionally substituted cycloalkyl, optionally substituted aryl, optionally substituted heterocyclyl and optionally substituted heteroaryl; [Only registered and activated users can see links. Click Here To Register...] Typically, male hormones like testosterone, which spurs muscle and body hair growth, far outweigh small traces of female hormones such as estrogen, which dictates breast size

The thyroid gland can go out of whack, pumping out an excess or lower amounts of thyroid hormones than the body needs [Only registered and activated users can see links. Click Here To Register...]