Retinoids on the other hand works by removing the top layer of skin cells, especially dead cells, and at the same time, promote the regeneration of collagen in the skin and works by preventing the rapid breakdown of the skin s structural fiber causing fine lines and large pores as we grow older. Last is chemical peel, which is a process supervised and administered by a dermatologist or licensed skin therapist, which provides better results compared to over the- counter chemical peel treatment kits. Here are the major external factors that cause aging and skin aging, it is up to you how to avoid these in order to maintain a young looking and vibrant skin. 1. The sun. This is the major external factor that caused aging. Experts say that aging caused by overexposure to the sun's ultra violet rays is called "photo-aging. Moisturizers are also necessary in making dry skin supple. Those with vitamin E and are oil-based are good moisturizers for dry skin. Use of cosmetics with moisturizing properties is also recommended. Oily Oily skin has big and visible pores, has coarse texture, and ends up always shiny. It is also more prone to clogged pores, leading to breakouts and acne. There are actually four main types, the oily skin, the dry skin, the normal skin and of course the combination type. This is basically determined by the degree of oiliness and dryness of your skin. As you will notice, some people are more prone to oiliness than others. Pore sizes also come into the picture. Consider choosing products that contain the antioxidants for the skin such as Ascorbyl Acid or Vitamin C, Vitamin E, Vitamin A or beta carotene and Flavonoids because these can help you to achieve a firm and younger looking skin while nourishing, strengthening and moisturizing your aging skin or your problematic skin. Vitamin C, on the other hand, has potent antioxidant properties and helps in collagen formation. Sufficient amount of vitamin C in the body keeps the skin young-looking and fresh. Sweet potatoes Also an excellent source of vitamin C and beta-carotene, sweet potatoes are rich in vitamin E, another good antioxidant and anti-aging.