Let's take a closer look at some of these key nutrients. Biotin, a B vitamin, is essential for keratin production, and a deficiency can result in brittle hair and hair loss. Iron is crucial for carrying oxygen to the hair follicles, and low levels can disrupt hair growth. 

Zinc plays a vital role in cell division and hair growth, and a deficiency can lead to hair shedding. Vitamin D helps regulate the hair growth cycle, and low levels have been linked to alopecia. In addition to these, other nutrients like vitamin C, vitamin E, and omega-3 fatty acids also contribute to overall hair health and can play a role in preventing hair loss.