b12 self injection pen Compounded Cyanocobalamin (Vitamin B12) (The National Institutes of Health) Aging can make it more difficult for the body to break down and absorb B12 Order B12 Self Injection Kits
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10.1016/j.scispo.2018.02.006 172 ZhouQ.ZhuX.-J.LiJ.-H

Individuals with B12 deficiency are at a higher risk of bone density loss, highlighting the importance of maintaining sufficient levels through injections

There are several B12 supplements available, and some (like B12 tablets) have high dosages far above the daily recommended value

[3] This is a known effect and not cause for concern
