Blackcurrant

Food · Fruit · Food, Typed Supps

Blackcurrants are small, tart berries loaded with vitamin C and deep purple plant compounds called anthocyanins that are good for your heart, eyes, and blood vessels.

Stage by stage

Chewing & Release (Mouth): Chewing ruptures the berries' skin and cell walls, releasing vitamin C and anthocyanin pigments for digestion.
Gastric Breakdown (Stomach): Stomach acid continues breaking down the fruit matrix, freeing additional vitamin C and anthocyanins into solution.
Intestinal Absorption (Small intestine): The small intestine actively absorbs vitamin C via dedicated transporters, while anthocyanins are absorbed more slowly and in much smaller amounts, typically under a few percent.
Bloodstream & Tissues (Bloodstream): In the bloodstream, vitamin C supports collagen formation and antioxidant defenses, while anthocyanins and their metabolites travel to tissues such as blood vessels and the eyes.

Timing

Blackcurrants are highly acidic and tart; eating them with a meal rather than on an empty stomach can ease stomach discomfort, though it doesn't meaningfully change how much vitamin C or anthocyanin your body absorbs.

Time to effect

Hours to Weeks: Blood vitamin C levels rise within hours of eating blackcurrants, while anthocyanin-linked effects on blood vessel function, lipids, and inflammation markers have generally been observed in trials after several weeks of regular intake.

Allergens

None of the fourteen major allergens. Derived from what this food is, not from a product label.

Eating patterns

Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Gluten-free. Depends on the product: Low-FODMAP.

In season

June to August in the northern hemisphere, December to February in the southern.

Satiety

205 on the satiety index, where white bread is 100 — very high. Modelled from the Holt et al. (1995) measurements.

Environmental footprint

1.1 kg CO2e and 199 litres of freshwater per kg, matched to "Other fruit" in Poore & Nemecek (2018), Science 360.

Cost band

Cheap — roughly £3 per kg, as a band midpoint rather than a price.

Key nutrients

Nutrition per 100g

Calories: 63
Protein: 1.4g
Carbohydrate: 15.4g
of which sugars: 8.1g
Fat: 0.4g
of which saturated: 0g
Fibre: 4.3g
Sodium: 2mg

Food vs. supplement

Whole blackcurrants deliver vitamin C alongside a full spectrum of anthocyanins, fiber, and potassium that isolated vitamin C pills don't replicate, though standardized blackcurrant extracts used in research provide more consistent, measurable anthocyanin doses than eating the fruit alone; blackcurrant seed oil supplements (a GLA source) also carry a theoretical bleeding risk with blood-thinning medications, so anyone on anticoagulants should check with a clinician first.

Kitchen tip

Freeze fresh blackcurrants in a single layer soon after buying, since freezing preserves both vitamin C and anthocyanins better than prolonged cooking or heavily processed juicing.

Common myth

"Blackcurrants are basically a vitamin C supplement in fruit form." In reality: Blackcurrants are genuinely vitamin-C dense (about 181 mg per 100 g, roughly double an orange), but most of their researched health effects on blood vessels, eyes, and inflammation are attributed to their anthocyanin pigments rather than vitamin C alone, and cooking degrades much of the heat-sensitive vitamin C while anthocyanins remain comparatively more stable.