B12 shots deliver a concentrated amount of cobalamin, a water-soluble vitamin essential for red blood cell formation, neurological function, and DNA synthesis, as detailed in the NIH fact sheet on vitamin B12
But as you can see, these high supplement doses may be aggravating (skin-wise) for the average person who receives B12 from dietary sources, such as red meat, chicken, eggs and fish
The peptide amount stays constant
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The results are temporary but should last approximately four to six months