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If needles aren't your thing, B12 supplements are also available in capsule, tablet, and liquid forms, which can often be purchased over-the-counter (via Medical News Today)

[9] [14] Neurological symptoms associated with B12 deficiencysuch as paraesthesia, ataxia, or cognitive impairmentrequire urgent treatment with more frequent injections (1mg on alternate days initially) to prevent irreversible nerve damage

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Both are copper peptides

Oz on Vitamin B12)