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The only human growth hormone (HGH) that comes from a truly natural source is that produced by the pituitary gland. Before 1985, medicinal HGH was extracted from the pituitary glands of cadavers, but this was abandoned after it was linked with Creutzfeldt-Jakob disease. As of January 2010, all medicinal HGH is synthesized using biotechnology.
Source:
Somatotropin.net: Human Growth Hormone History
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