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Without treatment, vitamin B12 deficiency can cause physical, neurological and psychological problems
Possible side effects are not well defined because no controlled human safety trial exists
If AHK-Cu is used at all, the better-evidenced route for its hydrophilic chemistry is topical [5] , and even then it is at most a speculative cosmetic adjunct to an evidence-based plan not a stand-alone solution, and certainly not something the data support injecting
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