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Vasan RS, Sullivan LM, DAgostino RB et al (2003b) Serum insulin-like growth factor I and risk for heart failure in elderly individuals without a previous myocardial infarction: the Framingham Heart Study

Individual response varies based on age, training status, nutrition, sleep, and tissue type

More Health News Medically Reviewed on 6/23/2026 Mayo Clinic: "Vitamin B-12." National Institutes of Health: "Vitamin B12." Oregon State University: "Vitamin B12." Top What Happens if You Take Too Much Vitamin B12 Related Articles 22 Healthy Foods High in B VitaminsAny deficiency of B vitamins can lead to various health conditions

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