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Wellness 20 July 2025 7 min read Needle Size for a B12 Injection: A Simple Guide By Alaiyka Parvez Owner, CoLaz Aesthetics Clinic The short version For an intramuscular B12 injection, the usual choice is a 22 to 25 gauge needle, 1 to 1.5 inches long, given at 90 degrees into the deltoid
Side effects can include pain or redness at the injection site, mild diarrhea, itching, or a feeling of swelling all over the body
Its generally advised to alternate retinol and copper peptides to avoid reduced efficacy or irritation
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Please note that all the risks mentioned are only associated with extremely high doses of vitamin B12
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