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Depending on the individual, they start working within 48 to 72 hours of the first dose, but they might take three months to completely correct a B12 deficiency

Starting with lower concentrations and gradually increasing helps identify your personal tolerance

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Vitamin B12 deficiency may cause numbness and tingling in the hands and feet, cognitive impairment, and reduced neurotransmitter production in the brain and spinal cord

However, the scientific evidence does not support the idea that vitamin B12 injections or supplementation directly lead to weight gain

Decreases in NAD+ levels have been associated with reduced neuronal signaling and impaired neuromuscular communication in animal models