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The average diet supplies about 5 to 15 mcg/day of vitamin B12 in a protein-bound form that is available for absorption after normal digestion
Insulin, which moves sugar from the bloodstream into cells, is a peptide
A review in Springer Sports Medicine emphasized that while peptides show exceptional promise, sourcing and quality control are critical
For example, athletes with high metabolic demands, vegans who consume no dietary B12, or individuals with chronic malabsorption issues like Crohns disease may find they feel their best with a bi-weekly (every two weeks) injection
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