Vitamin B, particularly vitamin B9 and vitamin Bc are the vitamins clinically proven to increase appetite, according to Health Guidance. While other vitamins may be thought to increase appetite, these are the only vitamins that have had clinical study proving their efficacy.
In addition to the vitamin B supplements that can boost appetite in children and adults, adding a form of exercise can also increase appetite. Exercise is known to stimulate the appetite because of the work that it puts the body through so the body needs additional fuel; therefore, the body increases appetite.
Vitamin Bc is also known as folic acid or vitamin M. It is destroyed by sunlight, boiling, heat and sulfa drugs. It not only increases the appetite, but also promotes healthier skin, reduces pain and helps take care of intestinal parasites.
Vitamin B9 is also known as folacin. It is a water-soluble vitamin that helps the body break down proteins and build new proteins. It not only increases the appetite, but it also helps stimulate digestive acid building and helps to build red blood cells. Vitamin B9 can be found in many food sources naturally, such as citrus fruits, citrus juices, whole grain wheat bran, beans, legumes, dark green leafy vegetables, pork, shellfish, liver and poultry.