How We Do It We assign products a rating of one to five stars. Five stars: Superior. These are top recommended, world-class products. Four stars: Excellent. These are some of the best products around. Three stars: Good—not perfect, but still worth your consideration. Two stars: Fair. These are better than having nothing at all (but not by much). One star: Poor. Our skincare review ratings are based on published medical and scientific research—not our personal opinions (whereas makeup is, by its nature, more subjective). While each type of product has its own unique criteria that determine its final rating, here are the general questions we try to answer for each review. Who is this best for, and how easy is it to use? Given its ingredient list & formula, can the product live up to all of its claims? If it makes skin-improving claims, does it actually contain ingredients that can help skin (and at effective levels)? Does the product contain any potentially irritating ingredients? How much? How does the product differ from similar types of products, including price? Is the product tested on animals? See animal testing report card.