Vitamin D Many biological systems depend on vitamin D. Kenney says its insufficiency is connected to poor metabolic health
vitamin D the "sunshine vitamin" since humans get it from sunlight.
B vitamin "plays an important role in the metabolism of your fat through your liver," adds Keanevey.
Zinc The body uses this vitamin for several functions.
Magnesium helps relax and sleep, "two things which are necessary for healthy weight loss," adds Kenney, making it increasingly popular.
Iodine This little addressed vitamin is crucial for thyroid function.