What two vitamins can your body make?

Vitamins are organic substances that can't be made by the body, so they have to be eaten. Exceptions to this are vitamin D, vitamin K, biotin, and folic acid. These vitamins are present in certain foods, but our bodies have other ways of obtaining them. skin and kidneys are involved in making vitamin D, and that good-guy bacteria in the intestines make vitamin K. Bacteria in the intestine also manufacture biotin and folic acid.