1. Effectiveness: Choose raw materials with obvious whitening effect, such as Vitamin C, arbutin, Ferulic Acid, etc.
2. Safety: Choose raw materials that are non-irritating and non-toxic to the skin to avoid over-stimulating the skin and causing allergies and other problems.
3. Stability: Choose raw materials with stability to avoid losing the whitening effect during the production process.
4. permeability: choose raw materials with good permeability, which can penetrate deep into the skin layer and play the whitening effect.
According to different skin types, needs and other factors, consider the choice of raw materials to achieve the best whitening effect.