Azelaic acid has antibacterial property and can be used as food preservative. It is beneficial to the prevention and treatment of dental caries when used in gargle, and can avoid the surface cracking of soap when used in soap. It has good permeability to the skin, and can be used in cream cosmetics to increase the absorption function of the skin. It has a variety of effects and can be used in skin ointment. It has the functions of skin lightening and whitening. Rhododendron acid or its zinc salt combined with vitamin B6 is used in hair care products, which is suitable for the treatment of male hormonal alopecia with strong endocrine, and stimulates hair growth at the same time.