Vitamin K, a fat-soluble vitamin, is found in green vegetables and salads, among other foods. It plays an important role in blood clotting and bone metabolism.
Vitamin C, a water-soluble vitamin, is an important antioxidant. It is found in fruits and vegetables and fulfills a variety of functions in the immune system.
Biotin is a water-soluble vitamin from the B complex and is widespread in nature. Biotin produced in the large intestine is partly available to the body.
The metalloid selenium (Se, selenium), like iodine (iodine), can be deficient in some regions. However, it plays an important role in the body and is essential.