Found in: Fish, mushrooms, cheese, egg yolks etc.Form: Cholecalciferol (vegetarian source lichen)Amount: 600 IU Our paediatricians say: Vitamin D3 is a very underrated mineral for growing children. Your kids may grow out of their clothes, but they’ll never grow out of good old natural minerals. For parents with picky children - slip our supplements into their chocolate milk, they’ll never know!