People love self care and tend to want to create their own potions. However, making beauty products are different from cooking. It requires 3 months of stability testing, 6 weeks of microchallenge testing and package compatibility testing as well as scale up. There are also regulations on what can be blended together.
While you don't need a degree to do self-care yourself, you do need trainings or getting products made by cosmetic chemists. This is like you do not go to doctors without credentials.