Native Americans were chewing on the bark of the white willow for pain relief and fever reduction long before the barks salicin led to the invention (and, later, FDA approval) of aspirin
While oral B12 is widely available, its not always the most effective, especially for individuals with absorption issues (like those with digestive disorders or older adults)
In the UK, buying and injecting B12 yourself is strongly advised against
A practical first step for many is a telehealth assessment that can triage the need for urgent care, recommend initial tests, and arrange prompt follow-up
doi:10.1093/ajcn/86.5.1302
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