Blackcurrant is a small, dark purple berry that grows on shrubs native to northern Europe and parts of Asia. Tart, intensely flavored, and packed with nearly four times the vitamin C of an orange per 100 grams, it’s one of the most nutrient-dense fruits available. Blackcurrants are a staple in European cooking and drinks but remain relatively obscure in the United States, where the plant was banned for most of the 20th century.
The Plant and Its Berries
The blackcurrant plant (Ribes nigrum) belongs to the Grossulariaceae family and grows as a woody shrub, typically reaching about five feet tall. It thrives in cool, temperate climates and is widely cultivated across Scotland, Scandinavia, Poland, and the Baltic states. The berries grow in clusters called “strigs,” ripening in midsummer to a deep, almost black purple. Some newer cultivars produce green-fruited varieties, though the dark berries are by far the most common and nutritionally rich.
Fresh blackcurrants have a strong, sharp taste that’s simultaneously sweet and sour, with an earthy depth that distinguishes them from blueberries or raspberries. The flavor is assertive enough that most people prefer them cooked or processed rather than eaten straight off the bush.
Nutritional Profile
Blackcurrants punch well above their weight nutritionally. The World Cancer Research Fund notes they contain almost four times the vitamin C found in oranges when compared gram for gram. They’re also rich in dietary fiber, with about 5.8 grams per 100-gram serving.
What makes blackcurrants particularly interesting is their anthocyanin content, the pigments responsible for that deep purple color. Over 97% of the anthocyanins in blackcurrants come from two families of compounds: delphinidin and cyanidin glycosides. These are the same types of pigments found in other dark berries, but blackcurrants contain them in unusually high concentrations. Anthocyanins act as antioxidants in the body and are linked to several of the berry’s health effects.
Despite having more total sugar per 100 grams than blueberries (roughly 24 grams versus 10 grams), blackcurrants have a remarkably low glycemic index of just 15, compared to 25 for blueberries. That high fiber content and the particular mix of acids in the fruit slow sugar absorption considerably.
The Seed Oil
Blackcurrant seeds yield an oil that’s valued for its unusual fatty acid profile. About 16% of the oil is gamma-linolenic acid (GLA), an omega-6 fat that’s rare in the plant kingdom. GLA plays a role in managing inflammation and is otherwise found mainly in borage oil and evening primrose oil. The seeds also contain roughly 13% alpha-linolenic acid, an omega-3 fat. This combination of both omega-3 and omega-6 fatty acids in a single seed oil is uncommon and makes blackcurrant seed oil a popular supplement, particularly for skin and joint health.
Health Effects
Most research on blackcurrant health benefits centers on the anthocyanins. In one clinical trial, participants who took 50 mg of blackcurrant anthocyanins showed significantly improved dark adaptation, the ability of eyes to adjust to low light. The same study found that people who took the extract before prolonged screen work reported less eye fatigue and fewer lower back symptoms compared to a placebo group.
Animal research has explored cardiovascular effects. In diabetic mice, blackcurrant reduced markers of inflammation in heart tissue and decreased the stiffening and thickening of blood vessel walls. The berry appeared to work by lowering levels of several inflammatory signaling molecules that drive cardiovascular damage in diabetes. Blackcurrant extract has also been shown to support blood flow during prolonged periods of sitting, suggesting benefits for circulation even in healthy people.
Why Blackcurrants Disappeared in America
If you’re in the United States, you may have never seen a fresh blackcurrant, and there’s a specific historical reason. In the early 1900s, the federal government banned cultivation of Ribes species, including blackcurrants, because the plants can host white pine blister rust. This fungal disease devastated timber-producing white pine forests, and eradicating blackcurrant bushes was considered essential to protecting the lumber industry.
The federal ban was eventually lifted, but regulation shifted to individual states. Most states now allow blackcurrant cultivation, though some restrictions remain. Michigan, for instance, still prohibits planting Ribes species. New York lifted its ban in 2003 and has since become the center of a small but growing American blackcurrant industry. Still, the decades-long absence means blackcurrants never became part of American food culture the way they did in Europe, where they flavor everything from throat lozenges to soft drinks.
How Blackcurrants Are Used
Because of their intense tartness, blackcurrants are rarely sold as a fresh snacking fruit. Instead, they’re processed into jams, jellies, juices, liqueurs, and dried fruit. Their high pectin content makes them naturally suited to jam-making, since pectin is what causes fruit spreads to set. In France, crème de cassis (blackcurrant liqueur) is mixed with white wine to make kir, a classic aperitif. In the UK, the blackcurrant-flavored drink Ribena has been a household staple for decades.
Fresh blackcurrant juice retains the highest levels of anthocyanins and other beneficial compounds. Industrial processing, however, dramatically reduces those levels. Heating, pasteurization, clarification, filtration, and enzyme treatments all break down anthocyanins, and storage causes further losses over time. Commercially produced blackcurrant juice concentrate also tends to have significant added sugar to offset the berry’s naturally sharp, sour flavor.
For people looking to get the most nutritional benefit, frozen whole berries or minimally processed powders and extracts retain more of the original compounds than shelf-stable juices or concentrates. Blackcurrant extract supplements, standardized to anthocyanin content, are another option and are widely available in capsule form.