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Testosterone is the primary male sex hormone, produced predominantly by the Leydig cells in the testes under the direction of the hypothalamic-pituitary-gonadal (HPG) axis
In the absence of formal oversight, purity, potency, sterility, and batch-to-batch consistency may vary considerablynot only among suppliers but also between production lots from the same manufacturer
Free Radic Res 2001
Additionally, its synthesis employs solid-phase techniques
But overnight or longer at room temperature can compromise the peptide
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