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For observational studies reporting serum vitamin B12 levels, the certainty of evidence was upgraded from low to moderate due to the large and consistent magnitude of effect across studies, despite heterogeneity
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Vitamin B12, found in foods such as meat, fish, and dairy, is involved in several critical processes in the body, including nerve cell health and function
doi:10.1038/nrgastro.2009.125
Growth hormones promote protein synthesis that helps build and repair muscle tissue
Wiener medizinische Wochenschrift (1946)
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