Radiation above 760 nanometers is called infrared radiation, it is responsible for the feeling of warmth experienced when exposed to the sun. Sun Protection Factor refers to the ability of a sunscreen to protect skin from solar radiation. Sylimarin has been shown to protect cells, especially the cells of the liver from being damaged by toxic substances. Vitamin E is a very powerful antioxidant. Immunological tolerance refers to an acquired specific failure of the immunological system to respond to an antigen.
Oral tolerance refers to immunological tolerance induced by administration of the antigen by mouth.
Glycerol esterified at each of the three hydroxyl groups by a fatty acid. Fat is made up in large part of triglycerides. UV-A radiation includes the wavelengths between 320 and 400 nm. UV-A does not produce sunburn, but produces a slow tan. UV-C is absorbed by the atmosphere ozone layer and is of no consequence for skin.