Healthy hair growth is a complex process influenced by nutritional status, hormonal balance, and psychological health. These sources highlight that deficiencies in essential vitamins like B, C, D, and E, along with minerals such as iron and zinc, can trigger significant shedding or brittle strands. Beyond nutrition, hormonal fluctuations involving DHT, estrogen, and thyroid activity play a critical role in the hair follicle's life cycle. Chronic stress is another major contributor, as elevated cortisol levels can prematurely push follicles into a resting phase, leading to temporary hair loss. Emerging research also explores how the nervous system and mitochondrial function directly regulate stem cells within the scalp. To combat thinning, experts ...