What the evidence says. Several controlled trials; effects real but modest or context-dependent.
Nutrition per serving 1 medium (58 g)
Water51.6 g89%
Sugars1.5 g3%
Fibre1.6 g3%
Other carbs2.3 g4%
Protein0.6 g1%
Fat0.2 g0%
What's in one serving, by weight — average composition (USDA).One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
Lemon (Citrus limon) is a fruit used for raises urinary citrate and ph, reducing calcium kidney-stone risk. NutriDex grades the human evidence as Moderate. The strongest human evidence for lemon concerns kidney-stone prevention: small clinical studies show lemon/lemonade reliably raises urinary citrate (an endogenous stone inhibitor) and urine pH, with one prospective randomized study finding lemon juice comparable to potassium citrate and better tolerated. Most of these trials are small, short, and often without hard stone-recurrence endpoints, so lemon is best viewed as adjunctive rather than first-line therapy. Lemon's vitamin C and citric acid also enhance non-heme iron absorption, a well-established mechanism. Cardiovascular benefits derive largely from citrus flavanones such as hesperidin, where RCTs (mostly in orange juice) and meta-analyses show modest reductions in blood pressure and improved lipid/endothelial markers; lemon-specific cardiovascular trials are sparse and small. A standardized lemon-flavonoid nutraceutical (eriocitrin) improved glucose and GLP-1 in prediabetes, but this used concentrated extracts, not whole fruit. Overall the evidence is moderate and mechanistically coherent for citrate/iron effects but thinner and largely extrapolated from citrus generally for cardiometabolic claims.
Purported Benefits
✓Raises urinary citrate and pH, reducing calcium kidney-stone risk
✓Vitamin C supports immune function and collagen synthesis
✓Citrus flavanones (hesperidin) modestly improve blood pressure and endothelial function
✓Enhances non-heme iron absorption when consumed with meals
✓Lemon flavonoids may improve glycemic markers and GLP-1 in prediabetes
High acidity can erode dental enamel and aggravate GERD or mouth ulcers; rinse with water after consuming. Citric/ascorbic acid may worsen reflux in sensitive individuals. Peel oils (limonene, psoralens/furanocoumarins) can cause phytophotodermatitis on sun-exposed skin. Grapefruit-style CYP3A4 drug interactions are minimal with lemon, but caution with furanocoumarin-containing peel. Generally very safe as food; concentrated flavonoid supplements lack long-term safety data. Educational only — always check with your doctor or pharmacist before combining Lemon with any medicine.
Lemon is most often taken for Raises urinary citrate and pH, reducing calcium kidney-stone risk, Vitamin C supports immune function and collagen synthesis, Citrus flavanones (hesperidin) modestly improve blood pressure and endothelial function, Enhances non-heme iron absorption when consumed with meals. Citrate-rich citrus for stone prevention
Does Lemon work — what does the evidence say?
Moderate evidence. Several controlled trials; effects real but modest or context-dependent. The strongest human evidence for lemon concerns kidney-stone prevention: small clinical studies show lemon/lemonade reliably raises urinary citrate (an endogenous stone inhibitor) and urine pH, with one prospective randomized study finding lemon juice comparable to potassium citrate and better tolerated. Most of these trials are small, short, and often without hard stone-recurrence endpoints, so lemon is best viewed as adjunctive rather than first-line therapy. Lemon's vitamin C and citric acid also enhance non-heme iron absorption, a well-established mechanism. Cardiovascular benefits derive largely from citrus flavanones such as hesperidin, where RCTs (mostly in orange juice) and meta-analyses show modest reductions in blood pressure and improved lipid/endothelial markers; lemon-specific cardiovascular trials are sparse and small. A standardized lemon-flavonoid nutraceutical (eriocitrin) improved glucose and GLP-1 in prediabetes, but this used concentrated extracts, not whole fruit. Overall the evidence is moderate and mechanistically coherent for citrate/iron effects but thinner and largely extrapolated from citrus generally for cardiometabolic claims.
What is the typical dose of Lemon?
1 medium lemon (~58 g) or 2-4 oz juice daily; lemonade therapy uses ~4 oz reconstituted juice in 2 L water/day
Is Lemon safe? Any cautions or side effects?
High acidity can erode dental enamel and aggravate GERD or mouth ulcers; rinse with water after consuming. Citric/ascorbic acid may worsen reflux in sensitive individuals. Peel oils (limonene, psoralens/furanocoumarins) can cause phytophotodermatitis on sun-exposed skin. Grapefruit-style CYP3A4 drug interactions are minimal with lemon, but caution with furanocoumarin-containing peel. Generally very safe as food; concentrated flavonoid supplements lack long-term safety data.
How many studies support Lemon?
NutriDex cites 11 sources for Lemon, graded "Moderate".
Cite this page
APA
Peh, D. (2026). Lemon (Citrus limon): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 16 Sept 2026, from https://nutridex.info/s/lemon
BibTeX
@misc{nutridex_lemon,
author = {Peh, Daryl},
title = {Lemon (Citrus limon): Benefits, Dosage, Side Effects \& Evidence},
year = {2026},
howpublished = {NutriDex --- The Supplement Research Compendium},
url = {https://nutridex.info/s/lemon},
note = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-09-16}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.