Apple is the fruit from the apple tree (Malus domestica). Apples are very commonly eaten as food. They also contain chemicals which are used as medicine.

Apples contain pectin, which helps bulk up the stool to treat diarrhea and constipation. Apples also contain chemicals with anti-inflammatory and antibacterial effects. Apple peel contains a chemical called ursolic acid, which may play a role in building muscle and metabolism.

People use apples for Alzheimer disease, cancer, diabetes, diarrhea, obesity, and many other conditions, but there is no good scientific evidence to support these uses.