New research suggests that a simple, affordable nutrient may help rewind the biological clock by protecting your DNA.

Rachael Link is a registered dietitian and health writer based in San Francisco. She completed her undergraduate degree at the University of Central Missouri and holds a master’s degree from New York ...

Vitamin D2 and D3 are the two main forms of vitamin D. Vitamin D2 is present in plants and yeast, while D3 comes from animal sources. Vitamin D is essential for a range of bodily functions, such as ...

Vitamin D2 is plant-based; vitamin D3 comes from sunlight and animal products. Vitamin D3 may be more effective than D2 at ...