Though hair growth is contingent on many uncontrollable factors like age, genetics, and health, it’s also connected to nutritional intake, diet, and overall well-being. In fact, a lack of certain nutrients, like iron, can trigger hair loss. Researchers have isolated the nutrients necessary for healthy hair growth. By eating properly and taking vitamin-rich supplements formulated for growth and thickness over time, we can ward off age-related hair loss. Which supplements are best for hair growth? Keep reading to find out.