NutriDex

The Supplement Research Compendium
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carrot

The beta-carotene benchmark — a sweet, crunchy provitamin-A powerhouse linked to lower cancer risk.

Moderate evidence 🥦Vegetables

✚ Updated · How we grade evidence

Evidence tier
Moderate
Research weight
Citations
10 verified / 10
Classification
Vegetables
❝
What the evidence says. Several controlled trials; effects real but modest or context-dependent.

Nutrition per serving 1 cup chopped, raw (128 g)

128gSERVING
  • Sugars 6.1 g5%
  • Fibre 3.6 g3%
  • Other carbs 2.6 g2%
  • Protein 1.2 g1%
  • Other 114.5 g89%
What's in one serving, by weight — average composition (USDA).
Vitamin C8%Fiber13%Potassium9%Folate6%Vitamin A100%+Vitamin K14%Vitamin B611%Manganese8%
One serving as % of the adult daily requirement (FDA Daily Values). The bold outer ring = 100% of a day's needs.
52 kcal1.2 g protein3.6 g fiber6.1 g sugar
NutrientPer serving% daily value
Vitamin C7.6 mg8%
Fiber3.6 g13%
Potassium410 mg9%
Folate24 µg6%
Vitamin A1069 µg119%
Vitamin K17 µg14%
Vitamin B60.18 mg11%
Manganese0.18 mg8%
Copper0.06 mg7%
Vitamin E0.85 mg6%
Magnesium15 mg4%
Calcium42 mg3%

Composition data: USDA FoodData Central ↗

What is carrot?

carrot is a vegetable used for exceptional provitamin-a (alpha-/beta-carotene) for vision and immune support. NutriDex grades the human evidence as Moderate. A single cup of raw carrots delivers over a full day's vitamin A as provitamin-A carotenoids (alpha- and beta-carotene), with fiber and potassium for modest extra benefit. Prospective-cohort meta-analyses consistently link higher carrot intake and higher circulating alpha-/beta-carotene to lower overall cancer incidence and lower all-cause mortality, with dose-response gradients. Importantly, whole-food carrots differ from high-dose beta-carotene supplements, which raised lung-cancer risk in smokers in landmark RCTs (CARET, ATBC) — a key distinction for clinical counseling.

Purported Benefits

✓Exceptional provitamin-A (alpha-/beta-carotene) for vision and immune support
✓Higher intake linked to lower overall cancer incidence (dose-responsive)
✓Circulating carotenoids tied to lower all-cause mortality
✓Carotenoid intake associated with lower type-2-diabetes risk
✓Lutein/zeaxanthin support macular and eye health

Dosing & Compounds

Typical Dose
Standard serving: 1 cup chopped, raw (128 g). Eat whole (with skin where edible); favour whole fruit over juice.
Active Compounds
beta-carotenealpha-caroteneluteinzeaxanthinfalcarinol (polyacetylene)falcarindiol

Safety & Cautions

Whole carrots are very safe. High intake can cause harmless skin yellowing (carotenemia). Crucially, high-dose beta-carotene SUPPLEMENTS (not food) increased lung cancer risk in smokers/asbestos-exposed individuals (CARET, ATBC) — favor dietary carotenoids over supplements, especially in smokers. Educational only — always check with your doctor or pharmacist before combining carrot with any medicine.

Key Studies ★ 10 studies

Meta-analysis Ojobor 2024 ✓ PubMed
Meta-analysis of prospective cohorts (~52,000 cancer cases) found higher carrot intake associated with lower overall cancer incidence (RR 0.90, 95% CI 0.87-0.94), with a dose-response (~5 servings/week ~20% lower risk).
Systematic review Yi 2023 (umbrella review) ✓ PubMed
Umbrella review of 30 meta-analyses (26 outcomes) found carrot intake associated with lower risk of breast, lung, pancreatic, gastric, urothelial, and prostate cancers, and serum carotene inversely associated with all-cause mortality.
Meta-analysis Bonaccio (Jiang) 2021 ✓ PubMed
Dose-response meta-analysis of prospective cohorts: dietary beta-carotene inversely associated with type 2 diabetes risk (RR 0.78, 95% CI 0.70-0.87, highest vs lowest).
Meta-analysis Zhao 2016 ✓ Full text
Meta-analysis of prospective studies: highest vs lowest dietary beta-carotene associated with lower all-cause mortality (RR 0.83); high circulating beta-carotene RR 0.69.
Meta-analysis of RCTs Druesne-Pecollo 2010 ✓ PubMed
Pooled RCTs of beta-carotene supplementation (≥20 mg/d) showed increased lung cancer incidence (RR 1.16, 95% CI 1.06-1.27) and gastric cancer in smokers/asbestos-exposed — landmark CARET/ATBC harm signal.
RCT (long-term follow-up) AREDS2 Report 28 (Chew) 2022 ✓ Source
10-year follow-on of the AREDS2 RCT: lutein/zeaxanthin vs no lutein/zeaxanthin lowered progression to late AMD (HR 0.91, 95% CI 0.84-0.99) and avoided beta-carotene's lung-cancer risk.
RCT AREDS2 Research Group (Chew) 2013 ✓ Source
RCT (n=4203) — adding lutein/zeaxanthin to the AREDS formula reduced progression to advanced AMD in participants with low dietary lutein/zeaxanthin (HR 0.74) and is the preferred substitute for beta-carotene.
Intervention trial Potter 2011 ✓ Full text
Controlled trial in healthy adults: 16 oz/day carrot juice for 3 months raised total plasma antioxidant capacity and reduced lipid peroxidation (malondialdehyde) without changing blood pressure or lipids.
Observational Deding 2023 (Danish cohort) ✓ Full text
Prospective cohort (~55,756 Danes, up to 25 y follow-up) found regular raw carrot intake associated with dose-dependent lower lung cancer incidence (HR 0.76, 95% CI 0.66-0.87); no effect for processed carrots.
Observational Deding 2020 (colorectal) ✓ Full text
Prospective cohort of 57,053 Danes (>18 y follow-up) found intake of >32 g/day raw carrots associated with 17% lower colorectal cancer risk versus no intake.
10 sources cited · 10 verified Search all studies on PubMed ↗

Common questions about carrot

What is carrot used for?

carrot is most often taken for Exceptional provitamin-A (alpha-/beta-carotene) for vision and immune support, Higher intake linked to lower overall cancer incidence (dose-responsive), Circulating carotenoids tied to lower all-cause mortality, Carotenoid intake associated with lower type-2-diabetes risk. The beta-carotene benchmark — a sweet, crunchy provitamin-A powerhouse linked to lower cancer risk.

Does carrot work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. A single cup of raw carrots delivers over a full day's vitamin A as provitamin-A carotenoids (alpha- and beta-carotene), with fiber and potassium for modest extra benefit. Prospective-cohort meta-analyses consistently link higher carrot intake and higher circulating alpha-/beta-carotene to lower overall cancer incidence and lower all-cause mortality, with dose-response gradients. Importantly, whole-food carrots differ from high-dose beta-carotene supplements, which raised lung-cancer risk in smokers in landmark RCTs (CARET, ATBC) — a key distinction for clinical counseling.

What is the typical dose of carrot?

Standard serving: 1 cup chopped, raw (128 g). Eat whole (with skin where edible); favour whole fruit over juice.

Is carrot safe? Any cautions or side effects?

Whole carrots are very safe. High intake can cause harmless skin yellowing (carotenemia). Crucially, high-dose beta-carotene SUPPLEMENTS (not food) increased lung cancer risk in smokers/asbestos-exposed individuals (CARET, ATBC) — favor dietary carotenoids over supplements, especially in smokers.

How many studies support carrot?

NutriDex cites 10 sources for carrot, graded "Moderate".

Cite this page
APA

Peh, D. (2026). carrot: Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/carrot

BibTeX
@misc{nutridex_carrot,
  author       = {Peh, Daryl},
  title        = {carrot: Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/carrot},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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