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The safety profile is comparable across injection, oral, and sublingual forms

You may experience some bruising around the injection site, this will resolve naturally but may take 1-2 weeks to resolve

But the vitamins found in supplements typically arent as available to your body as vitamins that come from natural food sources and again, if your body isnt absorbing vitamin B12 efficiently, you can wind up with a deficiency despite those supplements

The dramatic reduction in caloric intake necessarily decreases available energy

As indicated, this water-soluble vitamin would get eliminated from the body in a few hours or days