Depression is a mental disorder, but at some times is not treated as one. Depression is never to be taken lightly, and should always be taken very seriously.    Some symptoms of depression are:   - Lack of interest in normally enjoyable activities.
IU (international unit): An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat-soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes, and biologicals (such as vaccines).The definition of an international unit (IU) is generally arbitrary, technical, and eminently forgettable.For example, an IU of vitamin E is the specific biological activity of 0.671 milligrams of d-alpha-tocopherol. Nonetheless, most IUs are quite handy and helpful in use as a means of standardizing measures.he definition of an international unit (IU) is generally arbitrary, technical, and eminently forgettable. For example, an IU of vitamin E is the specific biological activity of 0.671 milligrams of d-alpha-tocopherol.
Adult men and women, including pregnant or nursing women, should consume 15 micrograms of vitamin D daily, according to the Institute of Medicine's Food and Nutrition Board. Vitamin D intake can also be measured in International Units; by this measure, adults require 600 International Units daily.Seniors over 70 years of age have a higher RDA -- 800 International Units, or 20 micrograms, of vitamin D each day.dult men and women, including pregnant or nursing women, should consume 15 micrograms of vitamin D daily, according to the Institute of Medicine's Food and Nutrition Board. Vitamin D intake can also be measured in International Units; by this measure, adults require 600 International Units daily.