Metabolic syndrome is a cluster of symptoms including high blood pressure, abdominal fat, and imbalanced cholesterol. Studies suggest potential benefits of vitamin D, whey protein, inositol, selenium, and whole grains. For instance, vitamin D improves insulin sensitivity and weight, whey protein lowers blood sugar, and selenium with inositol improves thyroid function in Hashimoto’s hypothyroidism. Whole grains are linked to healthy weight and cholesterol levels.