There is no such thing as the fastest and most effective medication for gray hair. Gray hair should be treated by prescription after identification under the guidance of a doctor. Causes of gray hair include blood deficiency, insufficiency of the liver and kidneys (weakness of the liver and kidneys), etc. If gray hair is caused by heredity, medication is not effective. Wu Fa Pill can nourish Yin, strengthen the brain, cool blood and darken hair, and is used to treat gray hair in adolescents. Ba Zhen Wan can benefit qi and replenish blood (replenish qi and blood in the body), and is used for treating deficiency of qi and blood, yellowish complexion (yellowish color without luster), and weakness of limbs. Yi Kidney and Hair Oral Liquid has the effect of tonifying the liver and kidney and making hair gray, and is used for treating hair loss and premature graying caused by deficiency of the liver and kidney. Finding the cause of the disease and then choosing the appropriate drugs or dietary therapy and other methods of treatment, the effect is the fastest and best.