头发白了，还能变黑吗？医生的答案出乎意料！

Core Viewpoint - The article discusses the causes of premature graying of hair and emphasizes the importance of scalp health in maintaining hair color and quality. It introduces a new shampoo product that claims to address these issues effectively. Group 1: Causes of Hair Graying - Hair turns gray due to the loss of melanocytes in hair follicles, which produce melanin [7] - Two main categories of causes for the loss of melanocytes are identified: pathological (e.g., follicle atrophy, chronic scalp inflammation) and physiological (e.g., genetic factors, aging) [8][11] - A study involving 467 individuals with premature graying found no significant correlation between graying and factors like obesity, alcohol consumption, or stress [11][13] Group 2: Scalp Health and Hair Care - The article highlights that scalp health is crucial for hair health, as the scalp serves as the foundation for hair follicles [19][21] - Many commercial shampoos only clean hair without effectively caring for the scalp, which is essential for nourishing hair follicles [24][25] - A new shampoo, 臻玉露Rebuild生姜氨基酸润养洗发露, developed by a team from Peking University, focuses on deep cleaning the scalp and nourishing hair follicles [29][31] Group 3: Product Features and Benefits - The shampoo contains a patented HAP-Rebuild repair factor and a high concentration (30%) of natural ginger juice, along with other herbal extracts [31][117] - Third-party testing shows the product has significant efficacy in controlling oil (87.88%), reducing dandruff (81.82%), and soothing itchiness (81.82%) [32] - The product is marketed at a special price of 98 yuan per bottle, with a trial offer that includes a free 100ml sample [55][56]