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Individuals should consult a qualified healthcare professional, use products from reputable sources, and understand that current evidence is limited
However, the scientific evidence does not support the idea that vitamin B12 injections or supplementation directly lead to weight gain
Studies on vaccines show that many genes interact with the response to vaccines, making us all unique in our immune response
The honest answer is that it depends, and it depends most on whether you are actually deficient
Seiwerth et al
As of writing, studies in laboratory animals have not identified significant safety concerns [3, 4]
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