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Certain gut-derived peptides (such as GLP1 analogs) indirectly elevate testosterone by reducing body fat, improving insulin sensitivity and lowering aromatase activity, which preserves testosterone
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45 Exclusion criteria included any contraindication to MRI, history of epilepsy, stroke, brain surgery, or structural brain disease, pregnancy, history of sulfur sensitivity, ongoing asthma or drug dependence, ongoing chronic diseases, history of mental illness, or acute infection during the prior 30 days
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