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An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
There are more bacteria in your mouth than there are people in the world.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.