Dianabol was developed by Dr. John Bosely Ziegler precisely for the treament of hypogonadism (Testosterone deficiency) and other disorders at low daily doses of 5-10mg.
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Just a quick comment re: Dianabol and John Ziegler - Ziegler had nothing to do with the development of D-Bol.
Dr. John Ziegler Did NOT Invent Dianabol