The Endocrine Society Nov 12 2024 Vitamin D supplements may lower blood pressure in older people with obesity and taking more than the Institutes of Medicine's (IOM) recommended daily dose does not provide additional health benefits, according to new research published in the Journal of the Endocrine Society. The IOM recommends 600 International Units (IU) per day. Vitamin D deficiency is common worldwide and has been associated with heart disease, immunological diseases, infections and cancer.