Lemons are just one example of the simple bounties Allah has provided us with. Although they may just be a "customary fruit,"
They contain flavanoids, which are often referred to as 'nature’s biological modifiers,' because of their ability to modify the body's reactions to other compounds such as: allergens, viruses and carcinogens.
Lemons are usually known for their high content of Vitamin C – four times higher than that of oranges.
A Hungarian scientist, uncovered a synergy between pure vitamin C and a then unidentified co-factor in the peels of lemons and called the resulting compound Vitamin P. Still known as such, Vitamin P particularly benefits the capillaries by reducing pain and improving blood circulation. It also heals cataracts, decreases bile production, alleviates herpes and lowers blood cholesterol levels
Other important properties of lemons are their mineral contents. They contain 48.3% potassium, which nourishes the brain and nerve cells; 29.9% calcium, which builds strong bones and teeth; and 4.4% magnesium, which in conjunction with calcium, plays an important part in the formation of albumen in the blood. In addition to their nutritional benefits, the smell and the taste of lemons can help fuel a general release of stress.
In aromatherapy, lemon oil is used as a muscle relaxant and a skin and circulation stimulant. Rubbed on the face, lemons open up the pores releasing heat and refreshing the skin. Lemons have other therapeutic effects on the body as well. Drinking lemon juice helps cleanse the lymphatic system, invigorate skin tissue and increase the blood flow this might be one reason for the popularity of lemonade on a hot, sticky day.
Eaten during pregnancy, lemons help build the developing baby's bones. Lemons also aid in the digestion of heavy meals by producing the necessary enzymes and in the assimilation of protein, calcium, zinc and vitamins. Lemons also have cholesterol – lowering properties, thus preventing hair loss and even causing hair regeneration. They counteract cases of anxiety and depression; stimulate the liver and the gall bladder, causing a release in congestion; stimulate the formation of valuable leukocytes in the fight against viral and infectious diseases; drain excess water in cases of water retention; reduce uric acid; and stimulate the lymphatic system in cases of cellulite and obesity

Health Tips
*To relieve a cold and sore throat, mix a teaspoon of honey and the juice of one lemon, in a glass of water and drink every two hours. Another family remedy, which I use frequently, is a clove of crushed garlic, mixed with half a lemon and sweetened with honey. This usually clears up anything I may be "coming down with" by the time Fajr prayer arrives.

*For cystitis, to acidify the urine and to stop bladder infections, drink a glass of cherry juice, lemon juice and water on an hourly basis at the first sign of infection

*For fevers, hot water and lemon juice will support and speed up the fevering process, helping the body fight-off infections or toxins. Without the fever, the immune system has fewer ways to combat the disease. However, if there are bowel problems this should be avoided

*For children, rub the body with two halves of a lemon to open the pores of the skin and release the body heat.

*To help proper assimilation of calcium and other minerals, or for leg cramps, sip a warm glass of water with a teaspoon of lemon juice p.

*As a mouthwash, lemons are more natural then fluoride and effective in removing plaque. They also whiten and strengthen tooth enamel

*For diphtheria, use pure lemon juice every hour as a gargle and swallow some until it cuts loose the false membrane in the throat.

*One tablespoon of pure lemon juice before each meal relieves asthma,

*In cases of excessive menstruation, the juice of 3-4 lemons a day will help.

Cooking Tips
With an increase in low-fat cooking, lemons have become more popular in the West, because of their ability to add sparkle and freshness to dishes. Lemons add a clean, yet complex flavour to dishes that were previously laden with salt or fat. Lemons, which cleanse the system, can replace vinegar, which opposes the action of gastric juices.
Remember that Allah (swt) gave us everything we may need. We merely adapt that bounty to the times by making new discoveries or rediscovering old applications.