Here are the resources that I used for all my research for the site.
1) I use scientific journals, peer reviews from the university medical library.
2) Harry’s Cosmeticology 8th Edition A cosmetic technical textbooks.
3)Handbook of Cosmetic Science and Technology, Third Edition My favorite book regarding cosmetic science!
7)The Western Herbal Tradition: 2000 years of medicinal plant knowledge, 1e This is one of the best books about herbal plants. I highly recommend it you want to learn about the use of herbal during different time period.