Limu (Laimun)
Quick Facts
- What it is: Limu is the lemon, a sour citrus fruit used as a single drug in Persian and Unani practice.
- Main uses: Thirst and dry mouth, Queasy stomach and poor appetite, Vitamin C in the diet, Helping iron uptake from plant meals
- Best for: Dry mouth and thirst, Adding vitamin C to meals
- Active ingredients: Citric acid, Vitamin C (ascorbic acid), Limonene in the peel oil, Furocoumarins in the peel
- Forms: Fresh juice, Grated or dried peel, Whole fruit in cooking, Syrup or sharbat, Essential oil (for scent only)
- Time to effect: Taste and mouth-watering effects are instant; any body-level change takes weeks.
- Side effects: Mainly tooth wear and stomach burning from strong or frequent use; skin plus sun can burn.
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What is Limu (Laimun)?
Limu is the lemon, the sour yellow fruit of a small thorny tree. It is a single drug in Persian and Unani practice. Healers use the juice, the peel and sometimes the seeds.
It is used for thirst and dry mouth. It is also used for a queasy stomach, poor appetite and to add flavour to other medicines. Lemon juice in food helps your body take up iron from beans and greens.
Good human trials on lemon as a medicine are few and small. So the medical proof is thin, even though the food use is safe and the history is long. A long history of use is not proof that something works.
How does Limu (Laimun) work?
Lemon is sour because of citric acid. It also holds vitamin C. These two may explain some of its uses, but most of this is a fair guess rather than proven fact.
Citric acid turns into citrate in the urine. Citrate binds calcium and may make it harder for some stones to form. This is why some kidney doctors suggest lemon water.
Vitamin C helps iron from plant foods pass into the blood. The sharp taste also makes you salivate (make spit). That may be why a slice of lemon helps a dry mouth.
What forms does Limu (Laimun) come in?
Fresh juice, squeezed and mixed with water, is the most common form.
Other forms are the grated peel, dried peel, the whole fruit in cooking, and lemon syrup or sharbat. Unani shops also sell lemon in mixed formulas.
Lemon essential oil is a separate product. It is very strong and is meant for scent, not for swallowing.
Where it comes from:
Lemon likely began in north-east India and moved west through Persia and the Arab world. Arab and Persian growers spread it around the Mediterranean by about the 10th century.
Unani texts list Laimun as a cooling drug for heat, thirst and a weak stomach. It is also a staple in Ayurvedic and European home care, so its traditional standing is broad.
Who should avoid Limu (Laimun)?
- Never swallow lemon essential oil. It is far too strong for the mouth and gut.
- Do not use lemon if you are allergic to lemons, limes or other citrus fruit.
- Do not put lemon juice or lemon oil on your skin before going out in the sun. It can cause a painful burn and dark marks that last for months.
- Do not drink strong or undiluted lemon juice if you have a peptic ulcer (a sore in the stomach lining) or bad reflux (acid coming back up the food pipe).
- Do not drink neat lemon juice. Always mix it with water to protect your teeth.
- Do not give undiluted lemon juice to a baby or young child.
- Do not put lemon juice in your eyes, nose or ears.
- Do not take large amounts of lemon with iron-rich meals if you have haemochromatosis (a condition where the body stores too much iron), unless your doctor agrees.
- Do not use lemon in place of a medicine your doctor has prescribed.
When should you see a doctor?
See a doctor if you have pain in your side or back, blood in your urine, or trouble passing urine. These can be signs of a kidney stone and need proper care.
See a doctor if heartburn or stomach pain keeps coming back, or if swallowing hurts. Also go if your teeth become sensitive or look worn.
Get urgent help if your lips, tongue or throat swell, or if you struggle to breathe after eating citrus. Also see a doctor for a lemon-and-sun skin burn that blisters over a wide area.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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