Buy a small yellow tube over 35 years old. Small green tube is a professional sports protection product imported from the Netherlands, which can repair muscle injury and warm up quickly. Small yellow tube is a skin care product that can inhibit the growth of melanin. A veritable "tiger balm" ingredient can not only whiten skin, but also prevent skin aging. Products over the age of 35 don't need muscle injury recovery and rapid warm-up, but need small green test tubes that can inhibit melanin growth and prevent skin aging, so buy small yellow test tubes at the age of 35.