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The trials studied it as a standalone

Thus, our knowledge of the subject has grown continuously
Late-Onset Hypogonadism and Testosterone Replacement in Older Men
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In older adults with mild cognitive impairment, 16 weeks of 3 g/day supplementation produced measurable cognitive improvements, though benefits did not persist after discontinuation

Solomon BJ, Mok T, Kim DW, Wu YL, Nakagawa K, Mekhail T, et al
