Capers
Overview
Capers are among the highest sources of quercetin, a flavonoid polyphenol that supports antioxidant networks and may have neuroprotective effects. The estimated flavonoid intake ranges from 50 to 800 mg/day (About 75% of dietary polyphenol count is quercetin). It is abundant in capers, apples, onions, berries, kale and soybeans.
Food Context
Synergies
- Part of diverse polyphenol intake strategy
- Pair with other quercetin sources
Preparation
- Can be used as seasoning or condiment
- Rinse if high-sodium pickled variety
Recipes
Nutrient Tables (per 100 g)
Core nutrients
| Nutrient | Amount per 100 g | % RDA per 100 g |
|---|---|---|
| Energy | 27 kcal | — |
| Protein | 0 g | — |
| Total fat | 0 g | — |
| Saturated fat | 0 g | — |
| Carbohydrates | 6.7 g | — |
| Fibre | 6.7 g | — |
Key micronutrients
| Nutrient | Amount per 100 g | % RDA per 100 g |
|---|---|---|
| Iron | 1.2 mg | 6.7% |
| Calcium | 0 mg | 0% |
Reference intakes: US Dietary Reference Intakes for adults (19–50 years; using the higher of male/female values where they differ).
Data provenance (core / micronutrient panel): USDA FoodData Central, CAPERS, FDC ID 2412103, API, per 100 g edible portion, last checked 2026-03-14
Substances
Substances in this food: editorial (Overview / literature) plus analytical (nutrition table).
3 substances in this food
Quercetin (and Isoquercetin)
Polyphenol; antioxidant; mitochondrial support; bioavailability improved with vitamin C
Sodium
Electrolyte for fluid balance and nerve function
Iron
Oxygen transport; dopamine synthesis (tyrosine hydroxylase cofactor)
References
- The estimated flavonoid intake ranges from 50 to 800 mg/day (About 75% of dietary polyphenol count is quercetin). It is abundant in capers (Neveu V et al database 2010), apples, onions, berries, kale and soybeans