Supplements with too much Vitamin A can be toxic to the liver since Vitamin A is a fat soluble vitamin (meaning more gets stored than excreted.) Sweet potatoes and other foods rich in Vitamin A, however, do not cause liver toxicity and can not be stored for long-term use like supplements can.
The wound healing stages are made up of three basic phases: inflammation, proliferation and maturation. There are many types of wounds that require different wound care products for proper recovery from an ulcer or laceration, but most go through similar healing stages.
A skin wound heals from the bottom up and from the edges inward. In the first stages of healing, the basic connective tissue of the skin collagen expands into the wound area. This builds the framework to support the rebuilding of the skin.