Nutritional deficiencies can impair the hair growth cycle, resulting in heightened shedding, thinning, and delayed regrowth. Insufficient levels of iron, Vitamin D, zinc, protein, and amino acids frequently impact the strength and integrity of hair follicles. Typical indicators include brittle hair, diminished volume, and persistent shedding. Recognizing the nutrients that promote healthy hair is essential for addressing deficiencies through dietary adjustments and supplementation.