Caprylhydroxamic acid, an ideal organic acid, has excellent anti-bacterial activity at neutral pH, and can be used in a formula system free of chemical preservative. Caprylhydroxamic acid is an organic acid that keeps the non-ionizing state in the whole process from acid to neutral, an optimal anti-bacterial organic acid. With the high chelation effect, it can inhibit the active elements required for molds and limit the environment required for microbial growth. Caprylhydroxamic acid is compatible with the majority of raw materials, not affected by surfactant, protein or other raw materials in the system, able to compound with alcohol, glycol and other preservatives. It can be added at normal temperature under high temperature condition, widely used in gel, essence, emulsion, cream, shampoo, shower and other skin care and hair care products.