b12 injection side effects reddit Vitamin and Safety B12 deficiency or just low?

Certain populations face higher deficiency risk: vegetarians and vegans (B12 is primarily found in animal products), adults over 50 (decreased stomach acid reduces B12 absorption), individuals with digestive disorders like Crohn's disease or celiac disease, and those taking medications like metformin or proton pump inhibitors

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[PMC free article: PMC7230874] [PubMed: 32244279] 51

Creams and serums are applied by pump, drop, or a consistent fingertip amount

Not approved by the FDA or TGA.

In the spinal cord, the myelin sheaths of the nerve cords are attacked, especially in the posterior column and pyramidal tracts