Blueberry

Blueberry (Vaccinium spp.): A Comprehensive Reference

1. Identity, Taxonomy, and Botanical Description

Blueberries are part of the Vaccinium genus within the Ericaceae (heath) family, which comprises around 450 species worldwide. The section Cyanococcus (cluster-fruited blueberries) includes the highbush blueberry (V. corymbosum L.), rabbiteye blueberry (V. ashei Reade), and the lowbush blueberry (V. angustifolium Ait.), which together account for the majority of commercial production and scientific study. More than 35 species of blueberries (Vaccinium L.) and huckleberries are indigenous to North America.

The species most commonly encountered in dietary supplement and nutritional research are:

• Vaccinium corymbosum L. — Northern highbush blueberry; the primary commercially cultivated species. This is a cultivated, North American species.
• Vaccinium angustifolium Ait. — Lowbush or wild blueberry; smaller-fruited and considered particularly rich in polyphenols.
• Vaccinium virgatum Ait. (syn. V. ashei) — Rabbiteye blueberry; widely grown in the southeastern United States.
• Vaccinium myrtillus L. — European bilberry, a closely related species, sometimes grouped with or compared to Vaccinium blueberries in the literature.

The fruit is a true berry botanically: a fleshy, indehiscent fruit developing from a single flower's inferior ovary, characteristically blue to blue-black in color owing to its high anthocyanin content. The characteristic five-pointed star-shaped calyx scar at the blossom end of each berry is a defining morphological feature.

2. Common Forms and Preparations

Blueberries are available in multiple forms for dietary, functional food, and supplement purposes:

• Fresh whole fruit — the whole, unprocessed berry as consumed fresh.
• Frozen whole fruit — commercially processed and studied in clinical trials.
• Freeze-dried powder — a preparation in which water is removed under vacuum at low temperature to preserve polyphenol content. Freeze-dried samples, particularly those subjected to flash pre-freezing, retain higher contents of anthocyanins and flavonol glycosides in the dried material compared to other drying techniques.
• Standardized extracts — liquid or encapsulated extracts standardized to anthocyanin content, used in many clinical trials.
• Blueberry juice and concentrates — liquid forms used in human interventional studies.
• Dried berries — a traditional preparation method used historically as food and medicine.
• Capsules and tablets — encapsulated blueberry powder or extract, the primary supplement form studied in randomized controlled trials.

Commercially available Vaccinium supplement products are packaged as loose powders, capsules, tablets, liquid extracts, and dried fruit forms.

3. Traditional and Historical Use

3.1 Indigenous North American Use

The indigenous North American peoples recognized the quality of blueberries and revered these plants. Beyond food needs, these plants played significant roles in their culture, sociology, economics, and spirituality. Because these traditions, developed and gathered over millennia, were transmitted orally, documentation of these uses has been determined through archaeological data, written records from Western civilization after first contact, and recent surveys of present-day native peoples.

Indigenous peoples have gathered blueberries for thousands of years, providing a vital source of food and medicine. The Dakota and Ojibwe peoples carefully managed blueberry patches to ensure continued harvests. Blueberries are considered a gift from the land and are included in many seasonal celebrations and feasts. The Ojibwe and Dakota peoples have long honored blueberries as essential to their diet and medicine.

Native Americans used various parts of the plant — roots, stems, leaves, flowers, and fruit — for medicinal purposes. Key documented preparations and uses include:

• Pemmican: The Algonquin and Iroquois tribes often dried blueberries to create a lightweight, nutrient-dense food called pemmican. Blueberries, dried in the sun, were added to soups, stews, and meat dishes. They were pounded and added as a preservative to pemmican.
• Medicinal beverages: Blueberry tea was often prescribed as a muscle relaxant or anti-spasmodic, especially for women during childbirth. Berries were also boiled down into a thick syrup which was used to treat the coughs and sore throat caused by tuberculosis.
• Leaf preparations: Tea made from the leaves was believed to improve the blood, while blueberry juice was used to treat coughs.
• Dye and preservative: Blueberry juice was also used as a great natural dye.
• Traditional pudding: A favorite dish of the Native American was Sautauthig, a simple pudding made with blueberries, cracked corn and water.

3.2 Contact with European Settlers

Early European settlers learned about edible uses of the berries, their growth patterns, and where the plants thrived from Native American communities. The 17th-century English naturalist John Josselyn documented his observations of berries in New England. He was a curious and good-humored observer of the 17th-century inhabitants of northern New England, both indigenous and colonists, and their ways. Josselyn was particularly interested in local, medicinal uses of plants, and of what he referred to as "bill berries," Europe's closest relative to the blueberries, he reported that the fruit is used "To cool the heat of Feavers, and quench Thirst." He also described how Native Americans sun-dried the berries and sold or traded them.

It was not until the 20th century that blueberries started to be commercially cultivated on a larger scale, with the development of new varieties and farming techniques.

4. Key Constituents and Active Compounds

4.1 Anthocyanins

Anthocyanins are the most studied and most pharmacologically significant class of compounds in blueberries. Blueberry fruits are rich in anthocyanins; there are 25 known anthocyanidins found in blueberries (Vaccinium spp.).

In several studies, 12 distinct anthocyanins have been identified in both blueberry and its jam extract. These included three derivatives of delphinidin, three of cyanidin, two of petunidin, one of peonidin, and three of malvidin, all with the 3-O-glucoside, 3-O-galactoside, or 3-O-arabinoside substitutions.

Specific individual anthocyanins isolated from blueberry include: delphinidin-3-O-galactoside, delphinidin-3-O-glucoside, petunidin-3-O-galactoside, petunidin-3-O-glucoside, and malvidin-3-O-galactoside, among others, isolated from rabbiteye blueberry (Vaccinium virgatum). Malvidin-3-glucoside (Mv-3-glc) and malvidin-3-galactoside (Mv-3-gal) have been identified as the most abundant anthocyanins in some blueberry varieties.

4.2 Other Polyphenols and Phytochemicals

The phytochemical profile of freeze-dried blueberry powder includes anthocyanins, flavonoids, and phenolic acids. Identified polyphenolic compounds include quercetin, gallic acid, cyanidin chloride, vitamin C, delphinidin chloride, trans-caffeic acid, procyanidin B1, and procyanidin B2.

Blueberry leaves are also phytochemically active. A total of 18 phenolic substances have been identified and quantified in extracts of highbush blueberry leaves. Chlorogenic acid, hyperoside, and rutin were shown to be the dominating constituents.

4.3 Bioavailability Constraints

A key limitation recognized across the scientific literature is the relatively limited bioavailability of blueberry polyphenols. Anthocyanins found in blueberries have attracted considerable interest for their outstanding abilities as antioxidants, anti-inflammatory agents, anti-diabetic, anti-obesity, and neuroprotection compounds, as well as their potential for preventing cardiovascular diseases, protecting vision, and inhibiting cancer development. However, their application is constrained by issues related to instability and relatively low bioavailability.

Only 5%–10% of the biologically active compounds in blueberries are absorbed in the small intestine, while the remaining unabsorbed compounds reach the large intestine and colon, where they are available for microbial metabolism. The bioavailability of the active compounds in blueberries is largely dependent on the gut microbiota, which may themselves be altered by blueberry components. Importantly, chronic consumption of blueberries has been shown to increase plasma polyphenol metabolites that are derivatives of gut microbial metabolism, suggesting that metabolism by the gut microbiota increases bioavailability of blueberry polyphenols.

5. Established Mechanisms of Action

5.1 Antioxidant Activity

Blueberry anthocyanins exhibit oxygen radical absorbance capacity (ORAC), scavenging power of ABTS+, and DPPH-free radical inhibitory activity in vitro. Blueberry anthocyanin extract (BAE) and malvidin glycosides decrease reactive oxygen species (ROS) and increase the enzyme activity of catalase (CAT) and superoxide dismutase (SOD), two key endogenous antioxidant enzymes.

5.2 Anti-Inflammatory Mechanisms via NF-κB Inhibition

Blueberry's two main anthocyanins, malvidin-3-glucoside and malvidin-3-galactoside, inhibit tumor necrosis factor-alpha (TNF-α)-induced increases of monocyte chemotactic protein-1 (MCP-1), intercellular adhesion molecule-1 (ICAM-1), and vascular cell adhesion molecule-1 (VCAM-1) production in endothelial cells in a concentration-dependent manner. These compounds decrease IκBα degradation and block the nuclear translocation of p65, suggesting their anti-inflammation mechanism is mediated by the nuclear factor-kappa B (NF-κB) pathway.

Anthocyanins affect the NF-κB and MAPK pathways, inhibiting the amalgamation of inflammatory mediators and pro-inflammatory cytokines in vascular smooth muscle cells and endothelial cells. Interleukin 1β (IL-1β) mRNA levels are significantly decreased by berry anthocyanins at 10 μg/ml or higher; TNFα mRNA levels and secretion are also significantly decreased in LPS-treated macrophages.

5.3 Nitric Oxide Modulation and Vascular Function

The upregulation of NO levels may be another antioxidant mechanism for blueberry anthocyanins, which contributes to vasodilatory effects. Cyanidin is related with augmented NO bioavailability, which is followed by augmented endothelium-dependent vasodilation.

5.4 Glycemic and Metabolic Mechanisms

The delayed postprandial glucose responses elicited by blueberry ingestion may be mediated by anthocyanin-inhibition of intestinal alpha-amylase and alpha-glucosidase activity (observed in vitro), thereby slowing the rate of carbohydrate digestion. Anthocyanins have also been shown to cause inhibition of glucose transport from the intestine to plasma, specifically by inhibiting the sodium glucose co-transporter 1 (SGLT1) and the glucose transporter GLUT2.

5.5 Gut Microbiota Modulation

Blueberry supplementation improves gut health by improving intestinal morphology, reducing gut permeability, suppressing oxidative stress, ameliorating gut inflammation, and modulating the composition and function of gut microbes. Both alpha and beta diversity analyses have indicated that gut microbiome profiles vary with blueberry dose. Additionally, specific taxa such as Prevotellaceae_UCG-001 and Coriobacteriales increase after blueberry consumption, adding to the mounting evidence of their role in polyphenol metabolism.

6. Scientific Evidence by Area of Health

6.1 Cognitive Function and Neurological Health

Evidence strength: Preliminary to moderate; results are promising but not conclusive.

Blueberries are known for their high content of several bioactive compounds, specifically anthocyanin, which are the most beneficial of the flavonoid family in terms of neuroprotection. Several human interventional studies have been conducted to assess the effects of blueberry intake on cognitive performance; however, the results of clinical trials are inconclusive.

A key systematic review published in the Journal of Gerontology reviewed 11 human studies. The results of 11 studies were reported, with 4 studies considering blueberry intervention with children aged 7–10 years, 4 considering adults aged 60 years and older, and 3 considering adults suffering from mild cognitive impairment (MCI). Findings indicate that cognitive benefits may be found for delayed memory and executive function in children, and for delayed memory, executive function, and psychomotor function in older healthy and MCI adults. There is less evidence to suggest positive benefits on working memory.

A systematic review and meta-analysis in CNS and Neurological Disorders Drug Targets (2023) pooled data from 14 randomized trials. Fourteen randomized trials were included in the quantitative analysis, and six were pooled for statistical analysis. Blueberry intervention resulted in no significant change in mood state score. Moreover, no significant effect of blueberry intake was shown in attention task reaction time, percentages of attention task accuracy, or one-back test accuracy. However, a significant effect was indicated in two-back test accuracy (WMD = 0.08; 95% CI: 0.02 to 0.13, P = 0.005).

A separate systematic review in Brain, Behavior, and Immunity found that based on the current evidence, blueberries may improve some measures of cognitive performance; however, considerable differences in study design, dosages, and anthocyanin content hinder between-study comparison. The use of standardized blueberry interventions, consideration of placebo formulations, and consistently reported cognitive performance tools are recommended in future trials.

One well-cited clinical trial in older adults with MCI reported that elderly with MCI who consumed blueberry juice (6–9 mL/kg/day) for three months exhibited improved late recall for word lists in the California Verbal Learning Test (CVLT) and better performance in the Verbal Paired Associates Learning Test relative to both baseline and placebo controls.

6.2 Cardiovascular Health: Blood Pressure and Endothelial Function

Evidence strength: Mixed; some positive signals in specific populations, but pooled meta-analytic data are not uniformly favorable.

A systematic review and meta-analysis published in Phytotherapy Research (2024) specifically examined blood pressure outcomes. A total of 17 articles were included, from which only two found significant results from blueberry and/or cranberry supplementation in reducing blood pressure. The review analyzed effects of blueberry and cranberry supplementation on systolic (SBP) and diastolic blood pressure (DBP) in patients with cardiometabolic diseases, with searches performed in PubMed, Scopus, Web of Science, Cochrane, and Embase.

One notable positive RCT tested 22 g of freeze-dried blueberry powder daily for 8 weeks in a hypertensive population. The study examined the effects of daily blueberry consumption for 8 weeks on blood pressure and arterial stiffness in postmenopausal women with pre- and stage 1-hypertension. This was an 8-week, randomized, double-blind, placebo-controlled clinical trial. Forty-eight postmenopausal women with pre- and stage 1-hypertension participated. Participants were randomly assigned to receive either 22 g freeze-dried blueberry powder or 22 g control powder.

Regarding endothelial function specifically, a 6-week randomized, double-blind, placebo-controlled trial at Pennington Biomedical Research Center found that endothelial function from baseline to end of trial was significantly improved, despite not observing any changes in blood pressure. In this trial, participants consumed twice daily a 12-oz yogurt and skim milk-based smoothie with 22.5 g of freeze-dried blueberry powder added (total 45 g/day).

A crossover RCT in healthy young adults (mean age 25.86 ± 6.81; n = 37) found that no significant difference was observed among fresh blueberry, blueberry powder, and the control arm for most endpoints. Plasma nitrite (NO₂⁻) levels were improved by 68.66% and 4.34% separately following whole blueberry and blueberry powder supplementations compared to the baseline, although it was not statistically significant. There were no other effects shown for SBP, DBP, total cholesterol, HDL-C, LDL-C, triglycerides, or glucose.

Human studies have shown that blueberry intake improves endothelial dysfunction in individuals with metabolic syndrome, increases endothelium-dependent vasodilation in healthy humans, and reduces blood pressure in postmenopausal women.

6.3 Glycemic Control and Type 2 Diabetes

Evidence strength: Preliminary to mixed; epidemiological signals are consistent but clinical trial evidence is inconsistent.

Blueberries are a rich source of polyphenols, which include anthocyanin bioactive compounds. Epidemiological evidence indicates that incorporating blueberries into the diet may lower the risk of developing type 2 diabetes (T2DM). A higher (≥ 2 servings/week) habitual blueberry intake is associated with a lower risk of type 2 diabetes based on population studies.

However, clinical trial findings are more complex. In an RCT with adults who had obesity and insulin resistance (pre-diabetes), insulin sensitivity was assessed by hyperinsulinemic-euglycemic clamps and improved after 6 weeks of daily blueberry intake (equivalent of 300 g fresh blueberries; providing 668 mg anthocyanins). Contrarily, other studies observed no discernible differences in insulin sensitivity in periods of 6 weeks and 24 weeks among participants with pre-diabetes (equivalent of 300 g and 150 g fresh blueberries, respectively; containing 580 mg and 364 mg anthocyanins, respectively).

Blood hemoglobin A1c and fructosamine were reduced after consuming blueberries daily for 8 weeks in men with type 2 diabetes. However, the current body of evidence on the impact of blueberry consumption on glucose regulation and insulin resistance in adults with dysglycemia yields mixed results, making it challenging to draw a definitive conclusion from the RCTs.

Firm conclusions regarding the anti-diabetic effect of blueberries cannot be drawn due to the small number of existing clinical studies. The varying types of berries, berry extract combinations, the methods of administering the treatments (whole berry vs. berry extracts), population studied, and the specifics of each study design bring a substantial amount of variation amongst the results in the various blueberry studies.

6.4 Antioxidant and Anti-Inflammatory Effects

Evidence strength: Strong at the mechanistic/in vitro level; human clinical evidence is supportive but limited.

Research has analyzed the antioxidant activity, antitumor activity, and immune function of anthocyanins and polyphenols extracted from blueberries. The crude extracts of anthocyanins and polyphenols exhibited excellent dose-dependent antitumor activity and antioxidant activity in vivo and in vitro. Purified anthocyanins and polyphenol compounds showed higher antioxidant activity, whereas the crude extract had a better inhibitory effect on tumor proliferation than pure extract, and the blueberry anthocyanin and polyphenol crude product mixture showed more powerful tumor suppression, possibly the result of a synergistic effect of multiple compounds. These results are from preclinical work and must be interpreted accordingly.

Blueberry is considered a good resource of anti-inflammatory anthocyanins, which can be promising molecules for the development of nutraceuticals to prevent chronic inflammation in many diseases.

6.5 Gut Microbiome and Gastrointestinal Health

Evidence strength: Preliminary; mostly animal and in vitro data, with limited human clinical evidence to date.

Data analysis from a systematic review indicates that blueberry supplementation improves gut health by improving intestinal morphology, reducing gut permeability, suppressing oxidative stress, ameliorating gut inflammation, and modulating the composition and function of gut microbes. However, there are significant knowledge gaps in this field, and further studies are needed.

Animal studies have provided important mechanistic data: blueberry polyphenols had differential effects at different doses — phenolic metabolism shifted in a dose-dependent manner, while gut microbial diversity was increased at moderate doses but decreased at higher doses. In preclinical studies, blueberry feeding decreased α-diversity (operational taxonomical unit abundance) and altered β-diversity. At the phylum level, the Firmicutes to Bacteroidetes ratio was significantly lower in the blueberry-fed groups, along with increased Tenericutes and decreased Deferribacteres.

6.6 Ocular Health

Evidence strength: Mechanistic (in vitro and animal); limited direct human RCT evidence for blueberry specifically.

The protective functional role of blueberry anthocyanin extract and its predominant constituents, malvidin, malvidin-3-glucoside, and malvidin-3-galactoside, has been examined on high glucose-induced injury in human retinal capillary endothelial cells (HRCECs). Results showed that these compounds enhanced cell viability, decreased reactive oxygen species (ROS), and increased the enzyme activity of catalase and superoxide dismutase. These findings indicate that blueberry anthocyanins could be promising molecules for the development of nutraceuticals to prevent diabetic retinopathy. These data derive from cell culture experiments, not from human clinical trials.

6.7 Cancer-Related Research

Evidence strength: Preclinical only; no robust human clinical evidence for anti-cancer effects.

Blueberry-derived anthocyanins have been reported to stimulate apoptosis and prevent the growth of cancer cells in cellular and animal model studies. Crude extracts were more efficient at improving immune function, as reflected by measurements of macrophage phagocytosis, lymphocyte transformation capacity, superoxide dismutase activity, and serum nitric oxide levels; these results indicate that blueberry anthocyanins and polyphenol extracts can improve immune function and reduce the metastasis and proliferation of cancer cells — findings derived from animal models that have not been replicated in human clinical trials.

6.8 Bone Health

Evidence strength: Preliminary; largely epidemiological and preclinical.

Epidemiological studies have shown associations between polyphenol-rich fruit intake and bone health, and preclinical studies have shown that blueberries improve bone health. To determine the genotype and dose of blueberries that are effective in ameliorating age-related bone loss, a multi-institutional team of investigators performed in vitro, preclinical, and clinical studies on blueberry varieties that differed in flavonoid profiles. Dietary anthocyanins, phenolic acid, and blueberry supplementation were shown to improve hyperglycemia in diabetic mice, attenuate whole-body insulin resistance in high-fat diet-fed mice, reduce inflammatory markers in adipose tissue, and aid in greater bone formation in rats. Human clinical data on blueberry and bone outcomes remain very limited.

7. Dosage Forms and Dosages Used in Studies

Dosages vary widely across clinical studies. The following are dosages as specifically reported in peer-reviewed human intervention studies:

• Freeze-dried blueberry powder, 22 g/day for 8 weeks: used in an RCT of postmenopausal women with pre- and stage 1-hypertension (participants were randomly assigned to receive either 22 g freeze-dried blueberry powder or 22 g control powder).
• Freeze-dried blueberry powder, 45 g/day for 6 weeks: used in the Pennington Biomedical Research Center RCT in adults with metabolic syndrome (participants consumed twice daily a 12-oz yogurt and skim milk-based smoothie with 22.5 g of freeze-dried blueberry powder added, totaling 45 g/day).
• Blueberry juice, 6–9 mL/kg/day for 3 months: used in the MCI cognition trial (elderly with MCI who consumed blueberry juice at 6–9 mL/kg/day for three months exhibited improved late recall).
• Fresh blueberries equivalent to 300 g/day (providing 668 mg anthocyanins) for 6 weeks: used in an insulin resistance RCT in obese, pre-diabetic adults (insulin sensitivity was assessed by hyperinsulinemic-euglycemic clamps and improved after 6 weeks of daily blueberry intake equivalent of 300 g fresh blueberries; providing 668 mg anthocyanins).
• In systematic reviews, study forms identified include frozen blueberry (n = 4 studies), blueberry concentrate (n = 2), beverage (n = 3), capsule (n = 1), extract and powder (n = 1).

No single standardized supplementation dose has been established across regulatory bodies for blueberry preparations. Dosages in clinical studies range from approximately 22 g to 45 g of freeze-dried powder per day and from single-dose (acute) interventions to interventions of up to 24 weeks in duration.

8. Safety Considerations and Drug Interactions

8.1 General Safety Profile

Blueberries as whole food are generally recognized as safe. In the context of dietary supplementation, adverse effects were not reported for blueberry in several clinical interventions reviewed in a 2025 umbrella review of herbal medicines for glycaemic control. The majority of published randomized controlled trials have not identified clinically significant adverse events with blueberry powder or extract interventions at the doses studied.

8.2 Bioavailability and Dose-Dependent Microbiome Effects

A preclinical consideration relevant to supplement dosing is that at moderate doses blueberry polyphenols increased gut microbial diversity (consistent with a prebiotic-like effect), while at higher doses gut microbial diversity was decreased, suggesting dose-dependent effects on the gut microbiome that warrant further investigation in humans.

8.3 Potential Interaction with Anticoagulant Therapy

Blueberries contain vitamin K, which is relevant to patients taking vitamin K antagonists such as warfarin. Warfarin works by inhibiting vitamin K-dependent clotting factors, but blueberries are unlikely to significantly interfere with therapy at typical serving sizes. Consistency in vitamin K intake is more important than restriction for warfarin patients; sudden large changes can destabilize INR control. Patients who significantly increase blueberry intake — particularly through concentrated extract or powder supplements — should do so with awareness of their anticoagulant management plan.

8.4 Anthocyanin Stability and Formulation Limitations

While anthocyanins found in blueberries have attracted considerable interest for their outstanding biological activities, their application is constrained by issues related to instability and relatively low bioavailability. This means that the pharmacologically active dose delivered to tissues from a given supplement preparation may vary substantially depending on the processing method, excipients used, and individual gut microbiome composition.

8.5 Limitations of Existing Evidence and Gaps

The current body of evidence on the impact of blueberry consumption on glucose regulation and insulin resistance in adults with dysglycemia yields mixed results, making it challenging to draw a definitive conclusion from the RCTs. Further research is required to explore the impact of blueberries on glucose intolerance and/or insulin resistance, with a particular focus on extended durations (> 6 months) and understanding individual factors associated with beneficial outcomes.

Firm conclusions regarding the anti-diabetic effect of blueberries cannot be drawn due to the small number of existing clinical studies. Although the current evidence is promising, more long-term, randomized, and placebo-controlled trials are needed to establish the role of blueberries in preventing or delaying T2DM.

Considerable differences in study design, dosages, and anthocyanin content hinder between-study comparison of cognitive outcomes. The use of standardized blueberry interventions, consideration of placebo formulations, and consistently reported cognitive performance tools are recommended in future trials.

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