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Retrieved June 10, 2025, from Office of Dietary Supplements

The search plan was made in Medline for Pubmed with the following mesh terms: IGF-1 and metabolism, carbohydrate, lipids, proteins, amino acids, metabolic syndrome, cardiovascular disease, diabetes between the years 19632015

A: People with diagnosed B12 deficiency, poor nutrient absorption, restrictive diets like veganism, or age-related absorption decline benefit the most from B12 injections

Some people may show results in a matter of days, while others may need several weeks or even months

Experts may recommend oral supplements or vitamin injections if a person has low vitamin B12 levels because of health conditions

Some publish lengthy local coverage determinations (LCDs) specifying how many injectable services they will cover