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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

Glutathione may be taken orally or through inhalation or injection

It may beneficially modify brain neurochemistry (increase in serotonin) and the stress response

It was an impressive achievement

Neuroscience 447 , 7493 (2020)