Q: How do cellulite creams work? A: The best cellulite creams work by targeting the fat underneath the top layer of skin. However, different products use different methods to attack that fat layer. Some products use caffeine to improve metabolism and blood flow. Others use collagen to repair and replenish skin, filling in the bumps and dimples caused by cellulite. Still others aim to reduce water retention. No matter the method for targeting cellulite, the best creams also work on the surface of the skin to firm and tone it with moisturizers. Good creams generally lead to satisfied customers, but no matter how good the reviews, don’t expect miracles.