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Increased GH levels promote the growth and development of muscle tissue and enhance overall metabolic function, which are closely linked to testosterone production

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Advertisement - Continue Reading Below How we chose the best vitamin B12 supplements We consulted nutrition experts Jessica Cording, M.S., R.D., author of The Little Book of Game-Changers , Keri Gans, M.S., R.D., author of The Small Change Diet , Stephanie Gray, D.N.P., M.S., A.R.N.P., a doctorally prepared functional medicine nurse practitioner and owner of Integrative Health and Hormone Clinic in Hiawatha, IA, and Elizabeth Somer, M.S., R.D.N., a dietitian based in Salem, OR and a medical advisory board member for Persona Nutrition

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