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Worldwide trends in body-mass index, underweight, overweight, and obesity from 1975 to 2016: A pooled analysis of 2416 population-based measurement studies in 1289 million children, adolescents, and adults (in Eng)
Factors that influence this include: Baseline B12 levels Symptoms and severity Absorption issues or medical conditions Diet and lifestyle factors Some people maintain healthy levels with occasional injections, while others require more consistent support
When taking vitamin B12, you should avoid taking vitamin C
10.1038/nature13445
Approved injection sites: Abdomen (except 2 inches around navel), thigh (front and outer), back of upper arm