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Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.