Cystine tablets can be used to treat hair loss, but they need to be taken for a long period of time to be effective, usually about 3-6 months of continuous use before the effect of hair regrowth can be observed. There are more types of hair loss, divided into baldness, seborrheic alopecia, and resting hair loss. Cystine is one of the amino acid types required by the human body. Hair follicle regeneration and hair growth after hair loss require a large amount of amino acid supplement, and cystine tablets can provide the required nutrients for hair growth. However, since hair growth has a growth cycle, cystine needs to be used continuously for about 3-6 months to be effective in the treatment of hair loss. However, it is important to note that patients should avoid interruptions or random discontinuation of the medication during the period of use, as this may affect the effectiveness of the treatment. In addition, during the treatment period with cystine tablets, patients should eat a light, low-oil diet, minimize greasy and fried foods, as well as stimulating foods, and keep a happy mood and relieve stress.