Tannins make up the largest component within witch hazel. This is the main source of healing for skin bruises and wounds. The leaves and twigs of the tree are used to make what is commonly known as witch hazel. The bark can also be used either fresh or dried for different ointments and healing balms. Witch hazel can be used in a tincture, an ointment, an infusion, and can even be distilled. Distilled witch hazel can be applied to skin that has not been broken but is hurt or inflamed. When applied to the hurt area, the skin will become less inflamed and the broken vessels underneath the skin will begin to heal. When used in a lotion on the skin and is an effective astringent and can help stop bleeding. It has also been known to help with healing veins and helping out with painful varicose veins. Witch hazel should only be used externally. You should only take witch hazel internally if you are under the supervision of a trusted medical professional.