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No studies have shown that extra B12 offers any benefits in these areas

GDF11 can improve the cerebral vasculature and enhance neurogenesis 18

Lifestyle Changes Exercise: Regular physical activity has been shown to increase glutathione levels and improve antioxidant defenses

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Pre-conception Folic Acid and Multivitamin Supplementation for the Primary and Secondary Prevention of Neural Tube Defects and Other Folic Acid-Sensitive Congenital Anomalies

Some people find that they prefer to have smaller quantities of B12 injected weekly or fortnightly, and others would rather take larger doses of B12 monthly