Does aronia berry lower blood pressure and cholesterol?

Aronia's exceptional antioxidant capacity traces back to an unusually dense and varied polyphenol composition⁶:

• Anthocyanins: 400–1480 mg per 100g fresh weight, primarily cyanidin-3-O-galactoside, cyanidin-3-O-arabinoside, and cyanidin-3-O-glucoside. These dark-blue pigments drive most of the cardiovascular and anti-inflammatory activity.
• Proanthocyanidins: Condensed tannins responsible for aronia's extreme astringency, present at concentrations rarely seen in other fruits. These bind to and inactivate pro-inflammatory enzymes.
• Hydroxycinnamic acids: Particularly chlorogenic acid, which slows glucose absorption and improves insulin sensitivity.
• Quercetin and other flavonols: Present in smaller amounts but contributing additional anti-inflammatory and endothelial effects.

This combination of polyphenol classes gives aronia several plausible routes of action rather than a single pathway, which is why researchers expected broad benefits; whether they show up in people is less clear, as the sections below explain.

Blood Pressure: Mixed Results

Blood pressure is the most studied outcome, and the human results conflict. Studies without a placebo group in people with metabolic syndrome reported falls^2,3, but the one randomized, placebo-controlled trial among these references, in 102 middle-aged adults with high-normal blood pressure, found no change in blood pressure after 12 weeks⁴. Two mechanisms have been proposed:

Endothelial nitric oxide upregulation: Polyphenols, especially anthocyanins, stimulate endothelial nitric oxide synthase (eNOS), increasing nitric oxide (NO) production in blood vessel walls. NO is the primary vasodilator — it relaxes smooth muscle and widens arteries. Aronia also reduces levels of endothelin-1, a potent vasoconstrictor, restoring the NO/endothelin balance toward vasodilation².

Oxidized LDL reduction: Much of cardiovascular disease risk stems not from total LDL but from oxidized LDL, which triggers arterial inflammation and foam cell formation. Aronia's anthocyanins and proanthocyanidins protect LDL particles from oxidation, reducing their atherogenic potential.

The meta-analyses disagree. A 2021 meta-analysis of controlled trials found that 6 to 8 weeks of aronia extract lowered systolic blood pressure, most in adults over 50¹. A 2019 meta-analysis of seven randomized trials found no effect on systolic pressure and a small rise in diastolic pressure⁵. A 2022 systematic review found no effect on blood pressure⁸, and the largest analysis so far, 10 randomized trials with 666 participants, found no significant effect on blood pressure or any other cardiometabolic marker and rated the certainty of the evidence very low⁷.

Cholesterol, Blood Sugar and Inflammation

The results for cholesterol and blood sugar are just as mixed.

Cholesterol: Hawkins and colleagues found total cholesterol fell¹. Rahmani and colleagues found HDL rose slightly and total and LDL cholesterol fell, most clearly in trials shorter than 10 weeks⁵. A 2022 review found no effect on total or HDL cholesterol⁸, and the 2025 analysis found no overall effect, with a possible fall only in people whose total cholesterol started below 200 mg/dL⁷. The proposed mechanisms are chlorogenic acid inhibiting intestinal cholesterol absorption and anthocyanins reducing hepatic cholesterol synthesis.

Blood glucose and insulin: Hydroxycinnamic acids — especially chlorogenic acid — slow post-meal glucose absorption by inhibiting alpha-glucosidase, the enzyme that breaks down dietary starch. In a 4-week open-label study of people with metabolic syndrome, higher aronia extract consumption was correlated with a positive effect on glycemia³. A 2022 review that pooled four studies found blood glucose 0.44 mmol/L lower⁸, but the 2025 analysis found no overall effect, and fasting glucose rose in people aged 50 or younger⁷.

Inflammation: The 2019 meta-analysis found no significant effect on C-reactive protein, tumor necrosis factor or interleukin-1⁵.

Gut Microbiome Effects

A 2022 randomized controlled trial gave 102 middle-aged adults with high-normal blood pressure an aronia polyphenol extract or a placebo for 12 weeks⁴. Arterial stiffness improved with aronia, while blood pressure, endothelial function and blood lipids did not change. Gut microbiome gene richness rose, as did butyrate-producing species. The authors suggest that polyphenols reaching the colon, and the bacteria that break them down, may help explain the effect on the arteries.

See our Berries page for an overview of anthocyanin-rich foods, and our Black Currant page for another high-anthocyanin berry with complementary research.

Practical Use

Form	Typical amount	Notes
Fresh or frozen berries	100–200g	Very tart; works well in smoothies with sweeter fruits
Unsweetened juice	100–300 mL/day	Choose 100% juice
Standardized extract capsules	300–500 mg/day	Most convenient; standardized to anthocyanin content
Dried powder	1–3 tsp	Can be added to smoothies, yogurt, oatmeal

Studies have generally run 4 to 12 weeks^3,4; Broncel's study used 100 mg of extract three times a day². No dose has been shown to lower blood pressure or cholesterol reliably⁷. Aronia has no documented serious drug interactions and is well tolerated, though high amounts may cause mild digestive discomfort due to the high tannin content.

Polyphenol Chemistry and Bioactivity

Ren et al. (2022) in Molecules published a comprehensive review of the bioactive constituents of Aronia melanocarpa and their pharmacological activities⁶. Aronia berries contain total polyphenol concentrations of 1500–8000 mg gallic acid equivalents per 100g fresh weight — among the highest documented for any commercially available fruit. Anthocyanin content ranges from 400 mg to over 1400 mg per 100g depending on cultivar and ripeness, with cyanidin glycosides dominating. Proanthocyanidin concentrations (500–1000 mg per 100g) are also exceptionally high. In vitro and animal model studies summarized in the review demonstrate antidiabetic, antineoplastic, antimicrobial, hepatoprotective, and neuroprotective activities through mechanisms including NF-κB pathway inhibition, Nrf2/ARE upregulation, AMPK activation, and direct free radical scavenging. Human bioavailability data show peak plasma anthocyanin concentrations 1–2 hours after aronia juice consumption, with gut microbiota converting unabsorbed polyphenols into smaller phenolic acids (protocatechuic acid, phloroglucinol derivatives) that circulate for hours longer and contribute to systemic effects.

Meta-Analysis: Lower Systolic Pressure and Cholesterol (Hawkins et al.)

Hawkins et al. (2021) in the Journal of Dietary Supplements pooled controlled trials of daily aronia extract taken for an average of 6 to 8 weeks, with three separate analyses (systolic blood pressure, diastolic blood pressure and total cholesterol) and age as a moderator¹. They concluded that aronia significantly lowered systolic blood pressure and total cholesterol, with larger effects in adults over 50, and called it safe. The abstract reports significant falls only for systolic pressure and total cholesterol; LDL and HDL cholesterol were not among the outcomes analysed.

Before-and-After Study: Metabolic Syndrome (Broncel et al.)

Broncel et al. (2010) in Medical Science Monitor gave 25 patients with metabolic syndrome aronia extract (100 mg three times a day) for two months and compared their readings with their own baseline; 22 healthy volunteers were measured for comparison but not treated². Systolic pressure fell from 143.4 to 131.8 mmHg and diastolic pressure from 87.2 to 82.1 mmHg, and endothelin-1 (a vasoconstrictor), total cholesterol, LDL cholesterol, triglycerides and a marker of lipid peroxidation (TBARS) fell, while the antioxidant enzymes superoxide dismutase and glutathione peroxidase rose. There was no placebo group, so these before-and-after changes cannot be separated from regression to the mean, other treatment or the effect of being studied.

Open-Label Study: Metabolic Syndrome (Tasic et al.)

Tasic et al. (2021) in Molecular and Cellular Biochemistry examined 4 weeks of a standardized aronia extract in 143 male and female patients with metabolic syndrome in a prospective open-label study³. Over 28 days of follow-up, supplementation significantly altered blood pressure and heart rate values. After 2 weeks, cholesterol had fallen significantly in one subgroup and LDL cholesterol in another, compared with each group's baseline, and triglycerides fell significantly after 4 weeks only in the diabetic groups, not in the non-diabetic groups. Higher polyphenol or extract consumption was correlated with positive effects on body weight, total cholesterol, low- and high-density lipoproteins, blood pressure, and glycemia, and the authors concluded that increasing consumption of polyphenol-rich foods could be a promising strategy to reduce cardiovascular risk. Like Broncel's study, it had no placebo group.

Randomized Controlled Trial: Arterial Function and Gut Microbiome

Le Sayec et al. (2022) in Clinical Nutrition ran a 12-week double-blind, placebo-controlled parallel trial in 102 prehypertensive middle-aged adults: 51 took an encapsulated aronia polyphenol extract and 51 a maltodextrin placebo⁴. Arterial stiffness improved with aronia compared with placebo: awake pulse wave velocity fell by 0.24 m/s and 24-hour peripheral augmentation index by 6.8 percentage points. Office and 24-hour blood pressure, flow-mediated dilation (endothelial function) and blood lipids did not change. Gut microbiome gene richness rose, as did butyrate-producing species such as Lawsonibacter asaccharolyticus and Intestinimonas butyriciproducens, and aronia-derived phenolic metabolites were associated with both the microbiome and arterial stiffness. It is the only randomized trial among this article's references, and it found no effect on blood pressure or cholesterol.

Meta-Analysis: A Diastolic Rise, No Systolic Effect (Rahmani et al.)

Rahmani et al. (2019) in Phytotherapy Research meta-analysed seven randomized controlled trials found in PubMed, Cochrane and Scopus up to December 2018⁵. Aronia raised HDL cholesterol slightly (weighted mean difference 1.48 mg/dl) and, against expectations, diastolic blood pressure (2.55 mmHg, 95% CI 0.63 to 4.47). It had no significant effect on systolic blood pressure, C-reactive protein, tumor necrosis factor or interleukin-1. Total and LDL cholesterol fell more clearly in trials shorter than 10 weeks, and a dose-response analysis linked 300 mg a day to lower triglycerides. The authors' conclusion stressed the HDL and cholesterol findings; the blood pressure results run against the claim that aronia lowers blood pressure.

Meta-Analysis: No Clear Effect (Frumuzachi et al.)

Frumuzachi et al. (2025) in Nutrients searched to January 2025 and pooled 10 randomized controlled trials (666 participants) of chokeberry supplementation lasting at least 2 weeks in adults with or without cardiometabolic risk factors⁷. Chokeberry had no significant effect on any outcome evaluated: body measurements, blood sugar control, blood lipids or blood pressure. Subgroup analyses hinted at lower total and LDL cholesterol in people whose total cholesterol started below 200 mg/dL, lower systolic pressure with products providing more than 50 mg of anthocyanins a day, and higher fasting glucose in people aged 50 or younger. Risk of bias was unclear or high in several trials, trial sequential analysis judged the evidence inconclusive for most outcomes, and GRADE certainty was very low for every marker.

Systematic Review: Cardiometabolic Disease (Christiansen et al.)

Christiansen et al. (2022) reviewed 17 studies of aronia in people with cardiometabolic disease or risk factors, four of which could be pooled⁸. Aronia did not change body weight, triglycerides, total or HDL cholesterol, or blood pressure; blood glucose was 0.44 mmol/L lower, and treatment for 6 weeks to 3 months tended to lower LDL cholesterol. The authors called for longer, high-quality randomized trials.

Evidence Strength Summary

The case for aronia rests on its striking polyphenol content and on early studies without a placebo group, in people with metabolic syndrome, that reported lower blood pressure and cholesterol^2,3. Pooled analyses of randomized trials do not bear that out consistently: one found lower systolic pressure and total cholesterol¹, one found no systolic effect and a small diastolic rise⁵, one found no effect on blood pressure or most lipids⁸, and the largest and most recent found no significant effect on any cardiometabolic marker, with very low certainty⁷. The one randomized trial among these references improved arterial stiffness without changing blood pressure or lipids⁴. Confidence 2 of 5: aronia may help some groups, but the trials conflict and are of low quality. It appeared safe in the trials reviewed¹.