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Cons: For very small microdoses, measuring accurately can be tricky

For example: Fatigue, unexplained weight loss, or abdominal pain may indicate liver disease or cancer Easy bruising, night sweats, or feeling full quickly (early satiety) may suggest a myeloproliferative disorder Swelling in the legs, reduced urine output, or persistent nausea may point to kidney disease In cases of very high B12 from injections (not oral supplements), some people have reported headache, nausea, diarrhea, facial flushing, or skin rash

If signs of B12 deficiency are present but total B12 levels are within normal range, it can be useful to seek functional assessment

NAD+ and Heart Helps produce ATP, which is fuel for the heart to beat