Sunlight reaches the earth surface as wavelengths of electromagnetic radiation between 290 and 1800 nanometers. Radiation of wavelengths between 400 and 760 is called visible radiation, it is harmless to humans. 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.