Hey Richard – curious about your thoughts on carbs driving down testosterone. Do you have any studies to that end? I wonder whether the Kitavans had/have low testosterone, despite 70% carb intake? It doesn’t seem immediately obvious to me that carb intake alone would inhibit testosterone, as long as you were getting adequate cholesterol, fat-soluble vitamins, zinc, selenium, etc. to support testosterone levels. These nutrients are often severely lacking in modern diets, as I’m sure you know! So it seems like misplacing causation for correlation to say that modern diets lower testosterone BECAUSE of their high carb levels. (They also have low mineral density, low fat-soluble vitamin levels, low fiber, low polyphenols/antioxidants, high iron, high fluoride/bromide, etc., which all could be confounding factors in the carbs-lower-testosterone hypothesis.)
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Many hormones and their structural and functional analogs are used as medication . The most commonly prescribed hormones are estrogens and progestogens (as methods of hormonal contraception and as HRT ),  thyroxine (as levothyroxine , for hypothyroidism ) and steroids (for autoimmune diseases and several respiratory disorders ). Insulin is used by many diabetics . Local preparations for use in otolaryngology often contain pharmacologic equivalents of adrenaline , while steroid and vitamin D creams are used extensively in dermatological practice.