Vitamin B12 is a water-soluble vitamin that is essential for the body’s nervous system, red blood cells, and DNA synthesis. It is found in animal products, such as meat, poultry, fish, eggs, and dairy products. Vitamin B12 is not found in plant-based foods. A 3-ounce serving of cooked chicken contains about 2.4 micrograms of vitamin B12, which is about 100% of the recommended daily intake for adults. Oranges, green leafy vegetables, and kidney beans do not contain any vitamin B12.

The vitamin deficiency that causes bleeding of gums and delayed healing of wounds is vitamin C. Vitamin C is also known as ascorbic acid, and it is essential for the production of collagen, a protein that is found in connective tissue. Collagen is important for the strength and structure of the gums, bones, and skin. When there is a deficiency of vitamin C, the body cannot produce enough collagen, which can lead to bleeding gums, delayed wound healing, and other health problems.

Only oranges contain vitamin C. Vitamin C is an essential nutrient that is found in fruits and vegetables. It is important for a variety of bodily functions, including immune function, wound healing, and collagen production. Broccoli, rice, and eggs do not contain vitamin C.