TB-500 is a synthetic fraction of the protein thymosin beta-4, which is present in virtually all human and animal cells. Thymosin beta-4 is a very large molecule. In fact, it is so large that it cannot fit entirely into the receptor. Different sections of the molecule have different activities. TB-500 is the part of thymosin beta-4 hormone which promotes the most useful effects (overall healing, repair, new blood and muscle cells). For medical applications it is more practical to use the TB-500 instead of the entire Thymosin Beta-4 protein.
Due to the possible cholesterol issues, moderate anabolic steroid cycles may be best served with SERM’s in order to protect against estrogenic related side effects. SERM’s will not negatively affect cholesterol; in fact, SERM’s like Nolvadex have been shown to promote healthy cholesterol levels due to their ability to act as estrogen in the liver. However, for many a SERM won’t be enough and AI’s will be necessary. If an AI is necessary, the individual should limit his use and only use as much as is actually needed. Some have suggested that a 10mg per day dosing of Nolvadex along with your Arimidex use may actually aid in cholesterol management.