What nutrient deficiency is associated with hair loss?

Zinc is an essential trace mineral that plays a crucial role in various bodily functions, including hair growth and repair. A deficiency in zinc can disrupt the hair follicle cycle, potentially leading to hair loss or thinning. This mineral contributes to protein synthesis and is vital for the maintenance of healthy hair, making it a key nutrient for preventing hair loss.

While iodine and vitamin D also play important roles in overall health, particularly in thyroid function and bone health respectively, they are not directly linked to hair loss in the same manner as zinc. Specifically, iodine deficiency is more commonly associated with thyroid disorders, which can have a secondary effect on hair health, but this link is not as direct as that of zinc. Vitamin D has been known to play a role in the hair growth cycle, but its deficiency is less commonly highlighted as a direct cause of hair loss compared to zinc.

By focusing on zinc, it's clear that its deficiency is specifically acknowledged in the context of alopecia and other forms of hair loss, making it the most direct answer to the question regarding nutrient deficiency and hair loss.