Drink plenty of water (but not cold) and steaming bowls of green tea because of the large number of antioxidants. Try also white tea, which is a real beauty maker; it is rich in a substance that inhibits the breakdown of collagen and elastin that keeps your skin smooth and prevents wrinkles.
Also, homemade (bone-) broths work wonders. These nutritional powerhouses are packed with collagen, minerals, hyaluronic acid and glycosaminoglycans that deeply nourish your skin cells! Nice side effect is that bone broths are anti-inflammatory and contain healthy fats that are essential to your heart and brain health. It provides amino acids, which strengthens your immune system; gelatin for digestion and gut health and the collagen supports your joints and will give a boost to your skin, hair and nails.