Melengestrol acetate
Encyclopedia
Melengestrol acetate is a pregnane
Pregnane
Pregnane is, indirectly, a parent of progesterone. It is a parent hydrocarbon for two series of steroids stemming from 5α-pregnane and 5β-pregnane ....

. It is approved for use as a growth promoter in livestock, including beef cattle, in the United States. Its use is not approved in the European Union or Canada.
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