1. Lemon contains more citric acid. This acid can not only promote the secretion of gastric juice, help digestion, but also can neutralize alkaline and prevent the pigmentation.
2. Lemon juice can make the skin smooth. Because the lemon juice contains lots of provitamin A which can keep the skin moist and white.
3. Lemon juice also can promote the growth of the hair and hair care.
4. In addition to, Lemon extracts has many functions, such as, anticancer activity, inhibiting HIV, antiviral and antibacterial properties, analgesic anti-inflammatory effects; Insect-resistant insecticidal activity.
5. Limonin analogues besides above biological effect, but also has significant diuretic effect on antioxidant activity, lowering cholesterol, , improving cardiovascular circulation, improving sleep, etc. 

6. Pharmaceutical(for curing diabetes mellitus.

7. Health food and food additive(Such as Brewing beer and whiskey)