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Whats an Ester?

April 26, 2017Ester

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Whats an Ester?

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A Steroid Ester refers to the chain of carbons attached to the steroid molecule at the 17th position. The longer the chain, the greater the time taken for the steroid to be released into the bloodstream. Testosterone propionate, for example, is a relatively short chain ester and therefore makes the parent hormone fast acting and requiring more frequent injections. The opposite is the case for longer chain esters e.g. enanthate, cypionate, undecanoate.