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i have b12 injections but still tired Common & Rare Side Effects of Vitamin Vitamin B12 Injection | Causes
Description
Blood levels remain relatively stable throughout the week even with once-weekly dosing

Its important to note that for individuals with adequate vitamin B12 levels, there is limited scientific evidence that B12 injections alone will enhance skin hydration or appearance

Ask your Veterinarian to submit your prescription by one of the following methods
So, can I just use supplements
They enhance metabolism, making it easier for your body to convert stored fat into energy