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Once you have chosen a site, use the alcohol pad to clean it
Cyanocobalamin is available in liquid, tablet, nasal spray, and capsule form
It will be painless, contain no additives, and it wont cost much
If you have symptoms that fit deficiency, asking your doctor about methylmalonic acid is reasonable even when the B12 looks fine
UK guidelines recommend monitoring clinical response and full blood count (typically at around 2 months) to ensure treatment adequacy, rather than routinely rechecking B12 levels after replacement has started
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