According to Dr. Christian Rimpler from Dr. Rimpler Skincare, you should avoid the following ingredients in skincare products: “Mineral oils, silicon oils and glycerin are synthetic substances. Glycerin makes your skin feel smooth and plump instantly, but in the long run it actually draws moisture out of your skin. Manmade emulsifiers usually end with the suffix ‘-ate’ (like glyceryl stearate). Polyethylene glycol (PEG) is also a no-no.”