A single cup of blackberries delivers nearly 8 grams of fiber, about half the daily vitamin C requirement, and one of the highest antioxidant concentrations of any common fruit, all for roughly 62 calories. Few foods pack that much nutritional return into so little.
But blackberries come with a 2026 caveat that changes the buying equation. In 2025, blackberries were added to the Environmental Working Group’s Dirty Dozen, the list of produce with the highest pesticide residues. Testing found residues on 93% of conventional blackberry samples, with an average of four different pesticides per sample and cypermethrin, a possible human carcinogen, detected in over half. That makes organic blackberries worth seeking out in a way that was not true a few years ago.
This guide covers the full nutrition profile, the research-backed health benefits, the organic-versus-conventional question, and how to select, store, and use them.
Quick Answer Blackberries are among the most nutrient-dense fruits available, providing about 62 calories, 7.6 grams of fiber, 30 mg of vitamin C, and high levels of vitamin K, manganese, and brain-protective anthocyanins per cup. They support heart health, digestion, brain function, and blood sugar control. Because conventional blackberries now rank on the EWG Dirty Dozen, with residues on 93% of samples, choosing organic blackberries is strongly recommended.
What Are Blackberries?
Blackberries are the aggregate fruit of plants in the Rubus genus, part of the rose family. Each berry is actually a cluster of tiny individual fruits called drupelets, each containing its own seed, which is why blackberries have their characteristic bumpy texture and high fiber content.
They grow on thorny (and increasingly thornless cultivated) brambles across temperate regions worldwide. Unlike many fruits, blackberries do not continue to ripen after harvest, so they are picked fully ripe, which also means they are delicate and perishable.
Botanically they share close kinship with raspberries, but blackberries retain their white core when picked, while raspberries pull away hollow. This small structural difference reflects a nutritional one: blackberries are denser in fiber and certain antioxidants.
Blackberry Nutrition Facts
Per 1 cup (144g) of raw blackberries, based on USDA FoodData Central data:
| Nutrient | Amount per Cup | % Daily Value |
|---|---|---|
| Calories | 62 kcal | 3% |
| Carbohydrates | 13.8g | 5% |
| Dietary Fiber | 7.6g | 27% |
| Total Sugars | 7g | N/A |
| Protein | 2g | 4% |
| Total Fat | 0.7g | 1% |
| Vitamin C | 30 mg | 33% |
| Vitamin K | 28.5 mcg | 24% |
| Manganese | 0.9 mg | 39% |
| Folate | 36 mcg | 9% |
| Vitamin E | 1.7 mg | 11% |
| Copper | 0.2 mg | 22% |
| Potassium | 233 mg | 5% |
| Magnesium | 29 mg | 7% |
Source: USDA FoodData Central. Values for 1 cup (144g) raw blackberries.
Two numbers stand out. The fiber content of 7.6 grams per cup is among the highest of any fruit, covering more than a quarter of the daily requirement in a single serving. And the manganese content at 39% of the daily value makes blackberries one of the best fruit sources of this bone and metabolism mineral.
The Antioxidant Powerhouse: Anthocyanins
The deep purple-black color of blackberries is not just visual. It comes from anthocyanins, a class of flavonoid antioxidants with some of the most extensively studied health effects of any plant compound.
Blackberries rank among the highest-antioxidant fruits available, measured by ORAC (oxygen radical absorbance capacity). The anthocyanins responsible, primarily cyanidin-3-glucoside, neutralize free radicals that damage cells and contribute to aging and chronic disease.
What makes anthocyanins particularly valuable is their ability to cross the blood-brain barrier, where they exert direct neuroprotective effects. They also reduce systemic inflammation by inhibiting the same inflammatory signaling pathways targeted by anti-inflammatory medications, though through gentler dietary means.
Blackberries also contain ellagic acid and ellagitannins, polyphenols with documented anti-cancer activity in laboratory research, plus smaller amounts of quercetin and chlorogenic acid. For a broader look at how antioxidant-rich foods support overall health, our top superfoods guide covers the highest-antioxidant foods and how they work.
Health Benefits Backed by Research
Brain Health and Cognitive Function
The anthocyanins in blackberries are strongly linked to cognitive protection. Research has associated regular berry consumption with slower cognitive decline and better memory performance in older adults. The mechanism involves anthocyanins crossing into brain tissue, reducing neuroinflammation, and improving blood flow to the brain.
A growing body of evidence connects higher dietary flavonoid intake to lower rates of age-related cognitive decline and dementia. Blackberries, as one of the richest flavonoid sources, are a natural fit for a brain-protective diet. For the complete picture of brain-supporting foods, our organic blueberries guide covers the closely related berry with similar cognitive benefits.
Heart Health
Blackberries support cardiovascular health through multiple pathways. Their fiber helps lower LDL cholesterol, their potassium supports healthy blood pressure, and their anthocyanins improve endothelial function and reduce arterial inflammation. Population studies consistently link higher anthocyanin intake with reduced risk of heart disease and heart attack.
Our organic food and heart health guide covers how berries and other polyphenol-rich foods fit into a cardiovascular-protective eating pattern.
Digestive Health
With 7.6 grams of fiber per cup, blackberries are a digestive powerhouse. The fiber is a mix of soluble and insoluble types: insoluble fiber adds bulk and promotes regularity, while soluble fiber feeds beneficial gut bacteria and supports a healthy microbiome. This fiber content also contributes to satiety, making blackberries filling despite their low calorie count.
Blood Sugar Regulation
Despite their sweetness, blackberries have a low glycemic index. Their high fiber content slows sugar absorption, producing a gentle rather than sharp blood sugar response. The anthocyanins also appear to improve insulin sensitivity in research. This combination makes blackberries one of the better fruit choices for people managing blood sugar, when eaten in reasonable portions.
Immune Support
At 33% of the daily vitamin C requirement per cup, blackberries contribute meaningfully to immune function. Vitamin C supports the production and function of white blood cells and acts as an antioxidant protecting immune cells from damage. Combined with the anti-inflammatory anthocyanins, blackberries support a well-regulated immune response. Our organic diet and immunity guide covers the full immune-nutrition picture.
Bone Health
Blackberries are an excellent source of vitamin K (24% DV) and manganese (39% DV), two nutrients essential for bone health. Vitamin K directs calcium into bone tissue, while manganese is required for the formation of bone matrix. For how vitamin K works with other nutrients to build bone, our vitamin K2 food sources guide covers the calcium-direction system in detail.
Organic vs. Conventional Blackberries
This is where blackberries require more attention than they did a few years ago.
In 2025, the EWG added blackberries to the Dirty Dozen for the first time, and they remain on the 2026 list. The testing data is the reason:
| Factor | Conventional Blackberries | Organic Blackberries |
|---|---|---|
| Samples with pesticide residue | 93% | Minimal to none |
| Average pesticides per sample | 4 or more | None synthetic |
| Cypermethrin (possible carcinogen) | Detected in over half of samples | Prohibited |
| EWG Dirty Dozen status | Listed (2025 and 2026) | N/A |
| Thin skin / systemic absorption | High vulnerability | Same structure, no synthetic residue |
Blackberries are especially vulnerable to pesticide residues for the same reason they are delicate: they have no protective peel, a bumpy surface of drupelets that traps residues, and high pest pressure that leads conventional growers to spray frequently. Washing cannot remove systemic pesticides absorbed into the fruit.
The presence of cypermethrin is the most notable concern. The EPA classifies it as a possible human carcinogen, and it was found in over half of conventional blackberry samples. For a fruit many people eat daily in smoothies and snacks, that cumulative exposure adds up.
The takeaway is clear: blackberries are now a fruit where buying organic is genuinely worth it. For the full context on which produce to prioritize organic, our dirty dozen and clean fifteen guide covers the complete 2026 rankings and the new PFAS findings.
Frozen organic blackberries are an excellent budget option. They are picked and frozen at peak ripeness, retain their full nutritional value, and cost less than fresh organic. Our organic frozen foods guide covers why frozen organic berries are nutritionally equal to fresh.
How to Select, Store, and Use Blackberries
Selecting: Choose berries that are deep black, plump, and firm. Avoid any with a reddish tint, which indicates underripeness, since blackberries do not ripen after picking. Check the bottom of the container for staining or mold, signs the berries underneath are crushed or spoiling.
Storing: Blackberries are highly perishable. Store them unwashed in the refrigerator and use within two to three days. Washing before storage accelerates spoilage, so wash only right before eating. For longer storage, freeze them in a single layer on a tray, then transfer to a container; frozen blackberries keep for several months.
Using: Blackberries are versatile. Eat them fresh as a snack, blend into smoothies, stir into organic yogurt or oatmeal, or add to salads. They work in both sweet and savory dishes, pairing well with everything from organic dark chocolate to roasted meats. For smoothie and drink ideas, our organic drinks and mocktails recipes guide has practical combinations, and our organic yogurt and kefir guide covers pairing berries with probiotic foods for a gut-and-antioxidant boost.
One practical tip: a light rinse in a vinegar-water solution (one part vinegar to three parts water) followed by a plain water rinse can extend the fridge life of fresh blackberries by killing surface mold spores, though it does not address systemic pesticides in conventional fruit.
The Bottom Line
Blackberries are one of the most nutrient-dense fruits you can eat, delivering exceptional fiber, vitamin C, vitamin K, manganese, and a remarkable load of brain- and heart-protective anthocyanins, all at just 62 calories per cup. The research supports their role in cognitive health, cardiovascular protection, digestion, blood sugar control, and immune function.
The one meaningful change in recent years is the pesticide picture. With blackberries now on the EWG Dirty Dozen and residues found on 93% of conventional samples, this is a fruit where choosing organic delivers real value. Fresh organic when in season, frozen organic year-round, both preserve the full nutritional benefit while eliminating the synthetic pesticide concern.
For building berries into a complete organic eating pattern, our guides on health benefits of eating organic and organic strawberries cover the broader berry and antioxidant picture.
