4. To even out skin tone and brighten a dull texture, look for products with Vitamin C, the holy grail for fading brown spots.
5. To rehydrate the skin and replenish those spaces between the cells, use a combination of lipids. Nourishing your skin via dietary sources such as salmon and other fatty fish is important, but you really need products with potent humectants like hyaluronic acid, which can hold 1,000 times its weight in water (tip by dermatologist Elizabeth Hale**)
6. "[In your 50s] Follow your instinct to upgrade to richer product and consider layering multiple hydrators from lightest to heaviest (tip by dermatologist Joshua Zeichner**)
7. To tighten slack neck skin, "look for products containing Peptides, which can stimulate collagen and elastin synthesis. Another ingredient you want: hyaluronic acid, which boosts moisture and plumps lines (tip by dermatologist Rachel Nazarian**)