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.
The next set of events in wound healing is the regrowth or proliferative phase. In this phase, new cells grow into the wound and begin to lay down the collagen and other extracellular fibers that will give strength to the scar. At the same time, new blood vessels are growing into the wound.