B12 is a water-soluble vitamin that helps form new hormones, blood cells, and protein, which all play a significant role in keeping you healthy
Initial loading protocols often use daily or every-other-day dosing for the first one to two weeks, followed by weekly, then monthly maintenance
Your healthcare provider may decide to do additional blood tests on you
Check with your health care professional about dosing for your individual situation
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
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