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Regarding your question,
in the past these biological materials was taken from the animals as the pig or horse or the monkey
or sometimes from the human himself
but nowadays these material are made based on genetics engineering by a technology called DNA recombinant technology
in which biomedical stuff that are identical or even improved(than the one taken from the animals because it is modified according to its pharmaceutical needs) are made in the laboratory
for example this sustanon drug is made by DNA recombinant technology , and an ester group is added to the known testosteron molecule so it will act for long time
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