Butylene Glycol is a chemical compound that has no efficacy or effect. It is most commonly used in skin care products for its moisturizing properties and safety. Butylene Glycol has good moisturizing properties. It is non-toxic, non-irritating, and has a fresh feel, so it does not feel sticky when applied to the skin. Because of its moisturizing and safety properties, butylene glycol is often used as a raw material in skin care cosmetics. Butylene Glycol has a large molecular size, which does not easily evaporate water, but rather absorbs more water, so it has a moisturizing effect on the skin without irritation, and it is very refreshing to be added to skin care products. Butylene Glycol, as a polyol substance, can maintain the moisture in the stratum corneum of human skin, and also prevent the formation of oxidized bone glue, which is effective in relieving skin hardening. If you experience discomfort after using butylene glycol-containing products, it is recommended that you seek prompt medical attention to identify the cause of the problem and to treat it.