Skin pigmentation plays a critical role in the color and appearance of skin and is determined by the amount of melanin generated and distributed within the body. Melanin is a group of related polymers of which two classes determine the pigmentation of skin: eumelanin and pheomelanin. Both are produced through a complex process called melanogenesis, where eumelanin and pheomelanin are produced in melanosomes by melanocytes in the basal layer of the epidermis. Eumelanin is a brown-black pigment while pheomelanin is a yellow-orange pigment. The ratio between these two pigments is what leads to the color of the hair, skin, and eyes of an individual, and it is often genetically determined with additional influence from internal and external factors.

Christine Tian is a research and innovation chemist at Rejuvi Laboratory. With an unwavering passion for cosmetic chemistry and product education, she is committed to advancing the boundaries of science and technology to develop cutting-edge skin care solutions. Through her work, she has published papers and formulations that address the intricacies of skin health and created products that deliver tangible results. Tian has graduate degrees in cosmetic chemistry and human health, and she is dedicated to product education and delivering products that empower professionals to succeed in the treatment room.