Just because it’s pricey and comes in a pretty jar, it doesn’t necessarily mean a product has more effective skin care ingredients, according to Arthur W. Perry, M.D., author of “Straight Talk About Cosmetic Surgery.” Often, “lower-priced products may work better than their more expensive counterparts,” said Dr. Perry. Whether a product costs $9 or $99, according to the doctor, there are three key ingredients to consider: vitamin C (also known as L-ascorbic acid), alpha-hydroxy acids (also known...