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Although there is a relationship between low vitamin B 12 levels and cognitive decline, clinical studies - including those involving people with Alzheimer's disease - have not shown improvement in cognitive function, even doses of vitamin B 12 as high as 1000 micrograms per day
Clinicians should maintain awareness that correlation does not imply causation
doi:10.1016/j.yrtph.2021.105004
Additionally, 15% of flagged ads offer the medication entirely without prescription requirements, raising concerns about the authenticity and safety of those drugs
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