α-Bergamotene, α-Pinene, α-Terpinene, α-Thujene, β-Bergamotene, β-Bisolobene, β-Phellandrene, Caffeic acid, Calcium, Carbohydrates, Choline, Citral, Citric acid, Fat, Vitamin B₉, Hesperidoside, Iron, Isopulegol, Limocitrin, Limonene, Sabinene, Magnesium, Manganese, Vitamin B₃, Vitamin B₅, Phosphorus, Polyphenols, Potassium, Vitamin B₂, Tannins, Terpenes, Vitamin B₁, Vitamin B₆, Vitamin C, Water, Zinc

Lemon is used to treat scurvy, a condition caused by not having enough vitamin C. Lemon is also used for the common cold and flu, H1N1 (swine) flu, ringing in the ears (tinnitus), Meniere's disease, and kidney stones. It is also used to aid digestion, reduce pain and swelling (inflammation), improve the function of blood vessels, and increase urination to reduce fluid retention. In foods, lemon is used as a food and flavoring ingredient.
Lemon is used for Halitosis, Gingivitis and Caries, Skin diseases, Anti- wrinkles, Nail diseases, Eyes disorders, Tonsillitis and Otitis, Rheumatism, Chilblains, Nosebleed, Digestive tract, Pinworms, Antiescorbutic, Antimigraine, Depurative, Sedative, Respiratory tract diseases, Circulatory system diseases, Diuretic, and Anticancerigenous.