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The NRV of vitamin B12 for adults is set at 2.5g/day in the UK. 10% to 30% of adults older than 50 years often have B12 malabsorption syndromes, driving absorption rates as low as 1% of the ingested B12. Thus, those adults would need to ingest 240 g of B12 to absorb at least 2.4 g

Always move to a different spot within your chosen area, maintaining at least 1 to 2 inches of separation from your previous injection site

B12 shots use intramuscular injection, depositing vitamin B12 directly into muscle tissue, typically in the upper arm or thigh

doi: 10.1172/JCI9842

Oral routes raise blood NAD+ more gradually than injection or IV