The reality check: the FDA does not consider it a legal cosmetic or dietary ingredient, and there is real concern that long-term use raises the risk of melanoma (skin cancer) the opposite of what most people assume a tan in a vial would do for skin safety (WebMD)
Typically consisting of 2-50 amino acids, these molecules act as signaling agents, influencing various physiological functions
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Most work by inhibiting the enzyme 5-alpha-reductase, which converts testosterone into DHT
Although anemia is often a symptom, the condition is actually the end stage of an autoimmune inflammation of the stomach known as autoimmune atrophic gastritis, resulting in destruction of stomach cells by one's own antibodies (autoantibodies)