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Vitamin B12 shots may help reduce the risk of the following conditions: neurological disorders problems with thinking and memory vision loss infertility neural tube defects in children born to those with a vitamin B12 deficiency There is no upper limit for the intake of vitamin B12 because the risk of toxicity or overdose is low

Used for: Prevention or treatment of B-vitamins deficiencies in farm animals

International Journal of Molecular Sciences , 22 (21), 11427

I see that @Steve_Combi has used higher doses before seeing a difference

It helps the body handle glucose, supports movement, maintains strength, and contributes to a healthier resting metabolic rate