Blueberry juice: a liter a day, and nothing moved

The biggest trial of blueberry juice gave it every chance. In a randomized trial of 94 adults with at least one cardiovascular risk factor, the 31 in the juice group drank 1.1 quarts (1 liter) a day for 4 weeks, and their blood viscosity, lipids, glucose and insulin did not change. The study was designed around fluid intake and lasted a month. A typical US serving of 8.7 oz (248 g) carries about 104 calories and 15 g of sugars, figures recomputed from a single recipe entry. Whether pressing the fruit costs anything in absorption is not settled. In 10 adults a single 11 fl oz (0.33 L) serving of a grape and blueberry juice blend delivered anthocyanins about as well as a smoothie. When 9 adults ate 8.8 oz (250 g) of blueberries whole or juiced, 108 urinary metabolite signals ran higher after the whole fruit against 8 after juice. The overall profiles were very similar at 2 hours, the only time point measured.

As people eat it, per 3.5 oz (100 g)

How much is actually in it

• Raw blueberries vary widely in manganese, from 0.18 to 0.94 mg per 3.5 oz (100 g) across 8 USDA samples, and in vitamin C from 4.3 to 11.1 mg. — USDA Foundation Foods samples of raw blueberries (n = 8 samples) Evidence E source
  Manganese mean 0.42 mg/100 g (0.182-0.935); vitamin C mean 8.06 mg/100 g (4.295-11.1)

What a real portion looks like

• A typical unspecified serving of blueberry juice in US survey data is 248 g, which carries about 15 g of sugars and 104 calories. — US household measures, FNDDS (n = 1 food code) Evidence E source
  Per 100 g: energy 42 calories, total sugars 6.08 g, vitamin C 5.3 mg, fiber 1.6 g; per 248 g: about 104 calories, 15.1 g sugars, 13.1 mg vitamin C

What your body absorbs

• In a crossover trial of 10 adults drinking 11 fl oz (0.33 L), anthocyanins were absorbed about equally from a grape and blueberry juice (841 mg/L) and a smoothie (983 mg/L). — 10 healthy adults, randomized crossover, single 11 fl oz (0.33 L) serving (n = 10) Evidence B source
  Plasma pharmacokinetics and urinary recovery of anthocyanins not different; 3,4-DHB better bioavailable from juice
• When 9 adults ate 8.8 oz (250 g) of blueberries whole rather than juiced, 108 urinary metabolite signals were higher after whole fruit against only 8 higher after juice. — 9 healthy adults, crossover, 250 g fresh blueberries whole or juiced, samples at 2 h (n = 9) Evidence B source
  108 ions higher after whole fruit vs 8 after juice; overall profiles very similar at 2 h

What cooking and storage change

• Baking blueberry powder into products cut anthocyanins by 42% compared with an unprocessed blueberry drink, yet blood vessel dilation improved to a similar degree in 10 volunteers. — 10 healthy volunteers, randomized controlled crossover, measurements up to 6 h (n = 10) Evidence B source
  Anthocyanins -42%, chlorogenic acid +23% in baked products; FMD increase similar to the drink

What it does to your health

• Drinking 1.1 quarts (1 liter) of blueberry juice a day for 4 weeks did not change blood viscosity, lipids, glucose or insulin in adults with cardiovascular risk factors. — 94 adults (67 men, 27 postmenopausal women) with at least one CVD risk factor, 4 weeks (n = 94) Evidence B source
  No change in whole-blood viscosity, fibrinogen, lipids, glucose, insulin, C-peptide
• A blueberry and apple juice taken for 4 weeks by 168 volunteers gave 20% protection against one type of lab-induced DNA damage but raised another type of DNA adduct by 28%. — 168 healthy volunteers, 4 weeks, juice providing 97 mg quercetin and 16 mg vitamin C per day (n = 168) Evidence C source
  Oxidative DNA damage -20% (P < 0.01); BPDE-DNA adducts +28% (P < 0.01), both ex vivo

Safety, limits and interactions

• Blueberry juice raised buspirone exposure by a non-significant 39% and left flurbiprofen unchanged, while grapefruit juice doubled buspirone levels. — healthy volunteers, oral buspirone (CYP3A) and flurbiprofen (CYP2C9) with and without juice Evidence C source
  Buspirone AUC ratio 1.39 (not significant) vs 2.12 with grapefruit juice; flurbiprofen 1.03
• Blueberry juice is rich enough in manganese to serve as an MRI contrast agent, with one oral dose carrying 18 mg, yet blood manganese did not change. — patients undergoing abdominal MR imaging Evidence C source
  18 mg manganese per oral dose; blood manganese unchanged

What people believe that the data does not support

• Drinking 17 fl oz (500 ml) of blueberry juice did not raise plasma antioxidant capacity in 9 women, unlike cranberry juice, whose effect came from vitamin C. — 9 healthy women, Latin square design, single 17 fl oz (500 ml) serving, blood up to 4 h (n = 9) Evidence C source
  No increase in plasma antioxidant capacity or phenols after blueberry juice
• The EU register lists a wild blueberry juice drink claim of anti-aging, urinary tract and vision benefits as non-authorized. — EU health claims register, snapshot 2026-09-21 Evidence E source
  Claim not authorized

Who this works differently for

• In 14 children aged 8 to 10, a single flavonoid-rich blueberry drink improved delayed word recall 2 hours later, with no benefit on attention or inhibition. — 14 children aged 8-10 years, crossover with at least 7-day washout, single drink (n = 14) Evidence B source
  Improved delayed recall vs matched vehicle; no benefit for attention, response inhibition, visuospatial memory
• In 21 children aged 7 to 10, drinks made with 15 or 1.1 oz (30 g) of wild blueberry powder improved memory tasks within 1 to 6 hours, best at the 30 g dose. — 21 children aged 7-10 years, double-blind crossover, three occasions (n = 21) Evidence B source
  Improved immediate recall at 1.15 h, delayed word recognition, interference accuracy at 3 h; dose-response

What is still unknown

• A postpartum supplement kit with blueberry juice blocked low mood in 21 women, but it also held 2 g tryptophan and 10 g tyrosine, so the juice's own share is unknown. — 41 healthy women on postpartum day 5, open label, supplement (n 21) vs no supplement (n 20) (n = 41) Evidence C source
  Mood shift 43.85 mm in controls vs 0.05 mm with supplement (effect size 2.9)

The bottom line

The antioxidant evidence is thin and mixed. In 9 women a single 17 fl oz (500 ml) glass of blueberry juice did not raise plasma antioxidant capacity or phenols, while cranberry juice did through its vitamin C, and such capacity tests are weak markers in any case. In 168 healthy volunteers, 4 weeks of a blueberry and apple juice gave 20% protection against one kind of lab-provoked DNA damage in blood cells and raised another kind of DNA adduct by 28%. Both were measured outside the body, and the abstract describes no control group. The EU register lists as non-authorized a wild blueberry juice drink claim of anti-aging, urinary tract and vision benefits. The most interesting results come from children, and they are small and acute. In 14 children aged 8 to 10, one flavonoid-rich blueberry drink improved delayed word recall 2 hours later, with no benefit for attention or inhibition, in a pilot with mixed results. In 21 children aged 7 to 10, drinks made from 15 or 1.1 oz (30 g) of freeze-dried wild blueberry powder improved memory tasks within 1 to 6 hours, best at 30 g. Neither drink was pressed juice and neither study went past a single day, so we found no trial of what a daily glass does for a child's memory. A postpartum kit that included blueberry juice and extract prevented a dip in mood on day 5 in 21 women compared with 20 who got nothing. It also held 2 g of tryptophan and 10 g of tyrosine, and the study was open label and not randomized, so the juice's own share is unknown. Processing changes the pigments more than the measured effect. Baking blueberry powder into products cut anthocyanins by 42% compared with an unprocessed blueberry drink. In 10 volunteers blood vessel dilation still rose to a similar degree over 6 hours, a short-term surrogate marker. Eight USDA samples of raw blueberries ranged from 0.18 to 0.94 mg manganese and from 4.3 to 11.1 mg vitamin C per 3.5 oz (100 g). Those are whole fruit figures, and what reaches the juice depends on pressing and filtering. Who should be careful. In healthy volunteers blueberry juice raised exposure to buspirone, a drug cleared by CYP3A, by 39%, which did not reach significance, and left flurbiprofen unchanged. Grapefruit juice in the same study raised buspirone exposure 2.12-fold. The abstract does not say how many people took part. The juice holds enough manganese to serve as an oral MRI contrast agent, with 18 mg in one dose, and blood manganese in the patients did not change, though the content depends on the berry and the juice. We have no card on a safe upper limit for manganese. We have no card on blueberry juice in pregnancy, in kidney disease or as a safety question for children. If you watch your sugar, the 15 g in a 8.7 oz (248 g) serving is the figure that matters.

Sources

1. bbju-r5-13 · USDA FoodData Central Foundation Foods, dataset
   Blueberries, raw (Foundation Foods, release 2026-04-30): Manganese, Mn 0.4228 MG mean, range 0.182-0.935 (median 0.3455), 8 samples; Vitamin C, total ascorbic acid 8.059 MG mean, range 4.295-11.1 (median 8.305), 8 samples
   USDA FoodData Central, Foundation Foods, release 2026-04-30 · checked 2026-09-29
2. bbju-r5-12 · reference dataset
   FNDDS 64104610 Blueberry juice (fdc 2709323): Energy 42 kcal/100 g, Total Sugars 6.08 g/100 g, Vitamin C 5.3 mg/100 g, Fiber 1.6 g/100 g, Potassium 56 mg/100 g; 1 fl oz 31 g; Quantity not specified 248 g
   USDA FNDDS 2021-2023, food code 64104610 · checked 2026-09-29
3. bbju-r5-01 · RCT
   Thus, we conducted a randomised, cross-over, bioavailability study (n 10) to determine the bioavailability of ACN and their metabolites from an ACN-rich grape/blueberry juice (841 mg ACN/litre) and smoothie (983 mg ACN/litre) in vivo ... Plasma pharmacokinetics and recoveries of urinary metabolites of ACN were not different for juice or smoothie intake; however, the phenolic acid 3,4-DHB was significantly better bioavailable from juice in comparison to smoothie.
   Br J Nutr, 2015 · checked 2026-09-29
4. bbju-r5-02 · RCT
   In urinary samples, whole blueberry treatment resulted in 108 ions that were significantly higher compared with juiced treatment (positive and negative mode combined), whereas only eight were significantly higher after juiced treatment. ... Both whole and juiced blueberries resulted in very similar metabolite profiles at 2 h, although this was the only time point measured.
   Br J Nutr, 2018 · checked 2026-09-29
5. bbju-r5-03 · RCT
   Although processing did not significantly change the total (poly)phenolic amount, the processed products contained significantly less anthocyanins (-42%), more chlorogenic acid (23%), no flavanol nonamers or decamers, and significantly more flavanol dimers and trimers (36% and 28%, respectively). FMD increased after 1, 2, and 6 h consumption of the baked products to a similar degree as the unprocessed blueberries
   Mol Nutr Food Res, 2014 · checked 2026-09-29
6. bbju-r5-04 · RCT
   Men (n 67) and postmenopausal women (n 27) with one or more risk factors for CVD who reported intake of < or =0.5 litres water daily were randomised to a control group (n 31), an intervention group (n 32) that increased their daily water intake by 1 litre/d and an intervention group (n 31) that ingested 1 litre blueberry juice/d. ... No change was seen in whole-blood viscosity or in levels of fibrinogen, total protein, lipids, glucose, insulin, C-peptide or other chemistry and haematology variables.
   Br J Nutr, 2006 · checked 2026-09-29
7. bbju-r5-05 · clinical trial
   In the present study, 168 healthy volunteers consumed a blueberry/apple juice that provided 97 mg quercetin and 16 mg ascorbic acid a day. ... Further, we found 20% protection (P < 0.01) against ex vivo H(2)O(2)-provoked oxidative DNA damage, measured by comet assay. However, the level of ex vivo induced benzo[a]pyrene-diol-epoxide (BPDE)-DNA adducts was 28% increased upon intervention (P < 0.01).
   Carcinogenesis, 2007 · checked 2026-09-29
8. bbju-r5-08 · controlled clinical trial
   The geometric mean ratio (GMR = AUC with GFJ divided by AUC with water) was 2.12. In contrast, the effect of BBJ (GMR = 1.39) was not significant. In the study of flurbiprofen (CYP2C9 substrate), the positive control inhibitor fluconazole significantly increased flurbiprofen AUC (GMR = 1.71), but BBJ had no significant effect (GMR = 1.03).
   Br J Clin Pharmacol, 2013 · checked 2026-09-29
9. bbju-r5-10 · clinical trial
   Blood concentrations of manganese were unchanged before and after an oral dose of blueberry juice that contained 18 mg of manganese.
   Radiology, 1995 · checked 2026-09-29
10. bbju-r5-09 · controlled clinical trial
    Consumption of blueberry juice had no such effects. CONCLUSION: The increase in plasma antioxidant capacity following consumption of cranberry juice could mainly be accounted for by an increase in vitamin C rather than phenolics.
    Eur J Clin Nutr, 2000 · checked 2026-09-29
11. bbju-r5-14 · EU claim register entry
    POL-HC-7636 Name of Food product: Sqeez Wild Blueberry Juice Drink Description of food in terms of food legislation categories: food not covered by specific food legislation Was food on Irish market before 1st July 2007: Yes Exact wording of claim as it appears on product: Blueberries have a wide range of health benefits including anti-ageing properties and the maintenance of urinary tract and vision health Is claim a picture: No Non-authorised
    EU Register on nutrition and health claims, claim POL-HC-7636, snapshot 2026-09-21 · checked 2026-09-29
12. bbju-r5-06 · RCT
    Using a crossover design, with a washout of at least 7 d between drinks, 14 children ages 8 to 10 y consumed either a flavonoid-rich blueberry drink or a matched vehicle. ... There was no benefit of our blueberry intervention for measures of attention, response inhibition, or visuospatial memory.
    Nutrition, 2015 · checked 2026-09-29
13. bbju-r5-07 · RCT
    Using a double-blind cross-over design, on three occasions children (n = 21; 7-10 years) consumed placebo (vehicle) or blueberry drinks containing 15 or 30 g freeze-dried wild blueberry (WBB) powder. ... Importantly, across all measures, cognitive performance improved, consistent with a dose-response model, with the best performance following 30 g WBB and the worst following vehicle.
    Eur J Nutr, 2016 · checked 2026-09-29
14. bbju-r5-11 · controlled clinical trial
    One group (n = 21) received the dietary supplement, composed of 2 g of tryptophan, 10 g of tyrosine, and blueberry juice with blueberry extract. The control group (n = 20) did not receive any supplement.
    Proc Natl Acad Sci U S A, 2017 · checked 2026-09-29