Nature Made®, the leading national vitamin and supplement broadline brand with over 50 years of delivering high-quality products with ingredients backed by s ...

About Nature Made Vitamins Nature Made® is the leading national vitamin and supplement broadline brand, with over 50 years of delivering high quality products that are backed by science.

Nearly a quarter of Americans are estimated to have a vitamin D deficiency. Why is that?

Vitamin D deficiency can result for a number of reasons, from not spending enough time outside to having certain health conditions to having a darker skin pigment, according to Yale Medicine.

You shouldn't take more than 100 mcg (4,000 IU) of vitamin D in a day unless a doctor recommends you do so to combat a deficiency, Thomason says.

From protein shakes to creatine and iron, supplements are up to 72% during Amazon's Prime Day sale.