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NAC is a cornerstone supplement in most longevity protocols because glutathione decline is one of the most consistent biomarkers of aging
Vitamin B12 is important to maintain the health of nerves, metabolism and red blood cells
Chem Rev 117:1276412850
Food and Drug Administration: Glucophage (Metformin Hydrochloride) Tablets Label JCEM Case Reports : Metformin-Associated Vitamin B12 Deficiency: An Underrecognized Complication Clinical Diabetes : Increasing Vitamin B12 Screening Among Patients With Type 2 Diabetes on Long-Term Metformin Therapy Harvard Health Publishing: Vitamin B12 Deficiency Can Be Sneaky and Harmful Johns Hopkins Medicine: Vitamin B12 Deficiency Anemia Yale Medicine: Are You Getting Enough Vitamin B12
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