Salicylic acid is a fat soluble organic acid, chemical formula C7H6O3. It is white crystalline powder, melting point is 158~161℃. It exists in willow bark, white pearl leaves and sweet birch in nature, and is an important fine chemical raw material, which can be used in the preparation of aspirin and other drugs.

Action Principle of salicylic acid
Salicylic acid can dissolve the materials formed between cutins, make cuticle falls off thereby, can purify too thick cuticle accumulated, promote the metabolism of skin. In addition, salicylic acid and some small molecules of fruit acid can enter pores, so as to dissolve oil, loose pores, blackheads.
The molecular weight of salicylic acid is small on the whole, it is easier to penetrate into pores to dissolve oil, and has bactericidal effect. It is more effective for acne skin and blackhead problem, but at the same time, it may bring dry skin and other phenomena. Slant oily especially acneous sex skin, the product effect of salicylic acid kind is better.

Salicylic acid for skin care:

1. Salicylic acid is the best choice for sensitive, steatorrhea skin cutin, salicylic acid with BHA has fat soluble properties, molecular weight also is bigger, can lock in the shallow layer cutin, does not affect the activity of skin cells, in terms of stability, degree of stimulation are relatively superior, the opportunity to create the cumulative stimuli and the degree of inflammation are fewer than the average acidity.
2. Salicylic acid is clear acne, narrow pore sharp tool: salicylic acid lipid solubility characteristics can be through the way of fusion with lipid, penetration into the cuticle and pore depth, but not to the dermal tissue caused stimulation. It can be secreted along the sebaceous glands into the deep pores, is conducive to the dissolution of old pores piled up cuticle, improve the situation of clogged pores, so can block the formation of acne and narrow the pores and remove pores in the blackhead acne. It takes 1-2 months for the effect to come into play.