Vitamin C can be made by most animals, but not humans. However, researchers are learning that a lack of the nutrient leads to decreased muscle and bone fractures. Also, it is believed that the higher the vitamin C levels in the blood of the brain, the less likely dementia is to develop, and this year, a Japanese researcher identified a protein that transports vitamin C to the brain. Another experiment has confirmed that a lack of vitamin C leads to inflammation in the liver and other organs.