Tetrapeptide-30 inhibits the gene expression of tyrosinase and reduces the amount of tyrosinase; inhibits melanocyte activation and reduces melanin production by reducing melanin α-MSH and melanin precursor POMC. In human keratinocytes, it can significantly reduce UVB-induced mRNA expression of interleukins IL-6, IL-8 and TNF-α.

The skin is the organ with the largest surface area of the human body, and it bears various external pressures daily, such as environmental pollution, UV damage, oxidative stress,etc.As the metabolism rate decreases, all kinds of "cell garbage" accumulate unknowingly.At this time, autophagy comes in