is b12 injection intramuscular Vitamin C and Techniques Best Vitamin B12 Injection Sites:

Applications: Osteoarthritis, sports injuries, and chronic joint pain

Those who have had a gastric bypass or other bariatric surgery [*]

Well...with evidence (use the BSH Cobalamin guidelines and other evidence I've included in a previous reply...and here's a B12 treatment review paper written by a haematologist and published in the Blood Joirnal on 13.5.2017 - fully under pinned by appropriate research papers: bloodjournal.org/content/bl

Vitamin B12 is essential for overall health, and for many people, supplements are a simple way to maintain healthy levels, especially if diet or medical conditions make deficiency more likely