Sweet lemon is a citrus fruit packed with vitamins. Some of the other common names used for sweet lemon include Mediterranean sweet lemon, sweet limetta and Limu Shirin in Iranian. In Iran, sweet lemon is a common treatment for the cold and flu because of its healing vitamin content. The peel of sweet lemon contains more vitamins than the fruit itself. You can get more vitamins from the sweet lemon by juicing the fruit and also using the peel.
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Sweet lemon contains 20 international units, or IU, of vitamin A per 100 g of edible portion, according to the Horticulture and Landscape Architecture at Purdue University. Sweet lemon contains the same amount of vitamin A whether you eat the citrus fruit fresh, peeled, frozen or concentrated. The peel of sweet lemon has 50 IU of vitamin A, but most people do not eat the peel. The Office of Dietary Supplements recommends 3000 IU of vitamin A for males and 2310 IU for females. Use the juice of a sweet lemon, along with the peel, and get up to 10 percent of your daily requirement of vitamin A for adult females.
Fresh sweet lemon contains 53 mg of ascorbic acid, also called vitamin C. If you are drinking fresh sweet lemon juice, you are getting 46 mg of vitamin C. Concentrated sweet lemon juice contains 30 mg of vitamin C. If you can eat the peel, you are getting 129 mg of fortified vitamin C. The Linus Pauling Institute of Oregon State University recommends anywhere from 40 mg of vitamin C daily for infants to 120 mg daily for adult smokers -- who need more vitamin C intake than nonsmokers do. This indicates that one serving of sweet lemon provides more than 100 percent of daily vitamin C requirements, regardless of your age.
Sweet lemon contains niacin, otherwise known as vitamin B-3. Whether eating it fresh or juiced, 0.1 mg of vitamin B-3 is in a sweet lemon. The raw peel contains 0.4 mg of vitamin B-3. If you want to juice the sweet lemon using the peel and the fruit juice, you are getting 0.5 mg of vitamin B-3, which is roughly less than 3 percent of the daily recommendation of vitamin B-3 for adult males and females.
One serving size of sweet lemon contains 0.04 mg of thiamine, better known as vitamin B-1, which provides 100 percent of the daily recommendation of this vitamin for children aged 1 to 3. Sweet lemon juice contains 0.03 mg of vitamin B-1, but the peel contains 0.06 mg of the vitamin. If you use the lemon peel and juice of a sweet lemon, you can get 100 percent of your daily requirement of vitamin B-1 if you're an adult female and roughly 83 percent if you're an adult male.