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Anti-Estrogens: Formestane

This was the first steroidal anti-aromatase brought to market. It is actually a prescription drug in other countries. It is well studies and is very safe and effective as supressing estrogen, making it perfect for including on cycle. This product seems to lower estrogen without having as good of a testosterone boosting effect due to its androgenic effect.  This is pretty debatable, with evidence on both sides, so it looks like Formestane is a pretty potent AI that can be of benefit for the bodybuilder looking to control estrogen and increase androgenic effects and levels.  High doses of Formestane can actually be a potent prohormone on its own, which is the basis for it being doubted to raise testosterone.  Recently Formestane has been conclusively proven to occur in mammals and is also a metabolite of DHEA. Synonyms: 4-Hydroxy-Androstenedione, 4-OH-Androstenedione, 4-Hydroxy-Androst-4-ene-3,17-dione CAS# 566-48-3

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