⚠ Evidence warning: Clinical trials or other evidence do not support the claims that tart cherry reduces soreness after marathon and ultramarathon racing, improves sleep latency and quality in insomnia and delayed-sleep phase, has a measured osteoarthritis effect smaller than anti-inflammatory drugs, and lowers systolic blood pressure by 5-7 mmHg in hypertensive adults. This page keeps it as a report of what people, websites or other media say.

Tart Cherry (Prunus cerasus)

Tart Cherry — scientific infographic poster

Table of Contents

  1. Overview and Botanical Profile
  2. Traditional Use and History
  3. Active Compounds
  4. Gout and Uric Acid Lowering
  5. Exercise Recovery and Muscle Pain
  6. Sleep and Natural Melatonin
  7. Inflammation and Joint Pain
  8. Cardiovascular and Metabolic Effects
  9. Forms and Preparations
  10. Amounts Commonly Used
  11. Cautions and Contraindications
  12. Key Research Papers
  13. Connections
  14. Featured Videos

Overview and Botanical Profile

Tart cherry (Prunus cerasus), also called sour cherry or Morello cherry, is a deciduous tree native to Europe and Southwest Asia and now widely cultivated in Michigan, Utah, Washington, Poland, and Turkey. It is botanically distinct from the sweet cherry (Prunus avium) and produces smaller, brighter-red fruits with a sharper, more acidic flavor and a substantially higher concentration of polyphenols.

The cultivar most studied in clinical research is the Montmorency tart cherry, an heirloom variety developed in the Montmorency Valley of France and now grown commercially in Michigan, which produces approximately three-quarters of the United States crop. Other research-grade varieties include Balaton (a Hungarian Morello), Schattenmorelle, and Erdi Botermo. Sweet-cherry studies generally cannot be substituted for tart-cherry studies because the anthocyanin and melatonin content differs by an order of magnitude.

The medicinal use of tart cherry centers on its dense concentration of anthocyanins, the deep-red pigments that give the fruit its color and produce most of its anti-inflammatory and antioxidant effects. Tart cherries are also one of the few natural dietary sources of melatonin, the hormone that regulates the human sleep-wake cycle.

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Traditional Use and History

Cherries have been gathered and eaten in Europe since prehistoric times, written about by classical authors such as Theophrastus and Pliny the Elder, and used for centuries in folk medicine — most famously the old American "cherries for rheumatism" remedy that prefigured today's research on gout. Modern scientific interest began in the late 1990s with work at Michigan State University on the anti-inflammatory cherry pigments — the fuller story is told in the dedicated History & Traditional Use article.

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Active Compounds

The therapeutic activity of tart cherry is attributable to a complex mixture of polyphenols, with anthocyanins as the dominant pharmacologically active class:

The oxygen radical absorbance capacity (ORAC) value of dried tart cherries is among the highest reported for common fruits, and standardized tart-cherry juice concentrates report anthocyanin contents in the range of 40-70 mg per 30 mL serving. Pharmacokinetic studies show that cherry anthocyanins are absorbed rapidly, peak in plasma within one to two hours, and are largely cleared by six hours, supporting a divided-dose regimen for sustained effect.

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Gout and Uric Acid Lowering

The strongest evidence base for tart cherry concerns the prevention of recurrent gout attacks. The landmark 2012 case-crossover study by Zhang and colleagues, published in Arthritis & Rheumatism, followed 633 gout patients and found that consumption of cherries or cherry extract over a 48-hour period was associated with a 35 percent reduction in the risk of a subsequent gout attack. When cherry intake was combined with allopurinol, the risk reduction reached 75 percent, suggesting an additive effect rather than redundant pharmacology.

Proposed mechanisms include direct inhibition of xanthine oxidase (the enzyme that generates uric acid from purines), increased renal urate excretion mediated by anthocyanin metabolites, and reduction of the NLRP3 inflammasome activation that triggers acute gouty inflammation when monosodium urate crystals deposit in the joint. Tart cherry does not replace urate-lowering therapy in chronic tophaceous gout, but it is a credible adjunct and may reduce attack frequency in patients with intermittent disease.

Several smaller human trials have confirmed modest reductions in serum urate (typically 0.4-0.8 mg/dL) after two to four weeks of daily tart-cherry juice or concentrate. The magnitude is smaller than allopurinol or febuxostat but is achieved without the hypersensitivity and hepatic risks of pharmacological xanthine-oxidase inhibitors. Tart cherry is generally described as safe alongside urate-lowering therapy; its possible effect on blood-thinning medicines is covered under Cautions below.

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Exercise Recovery and Muscle Pain

A second well-developed evidence base concerns tart cherry as a recovery aid after strenuous, eccentric, or endurance exercise. The best-known trials used different regimens: a 2006 trial by Connolly and colleagues gave 12 fl oz of a tart cherry juice blend twice a day for eight days, with the exercise on day four; a 2010 marathon trial by Howatson and colleagues gave tart cherry juice for five days before, on the day of and for 48 hours after the race; and a 2011 trial by Bowtell and colleagues gave a Montmorency cherry juice concentrate for seven days before and 48 hours after intensive leg exercise.

Documented effects in controlled trials include:

The combination of anti-inflammatory anthocyanin activity and antioxidant action against exercise-induced reactive oxygen species appears to be the mechanism. Importantly, the recovery benefit does not blunt the training adaptation in the way that high-dose vitamin C and vitamin E supplementation has been shown to do; the polyphenol load from tart cherry is closer to a dietary intake than to a pharmacological antioxidant bolus.

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Sleep and Natural Melatonin

Tart cherries are one of the only dietary sources of measurable melatonin, the pineal hormone that signals biological darkness and helps anchor the circadian sleep-wake rhythm. The 2012 study by Howatson and colleagues, in 20 volunteers who drank 30 mL of tart cherry juice concentrate twice daily for seven days, found statistically significant increases in time in bed, total sleep time and sleep efficiency, measured with a wrist activity monitor (actigraphy), compared with placebo. Subsequent trials in older adults with chronic insomnia and in younger adults with delayed-sleep phase have reported similar modest improvements in sleep latency, time awake after sleep onset, and overall sleep quality.

Two small pilot trials studied older adults with insomnia. In a 2010 study of 15 older adults with chronic insomnia (Pigeon and colleagues), a tart cherry juice blend reduced insomnia severity, measured as minutes awake after falling asleep, compared with placebo, but did not improve the time taken to fall asleep, total sleep time or sleep efficiency. In a 2018 study (Losso and colleagues), the 8 people with insomnia who completed it slept 84 minutes longer on overnight sleep recording (polysomnography), while most of the sleep questionnaires showed no significant difference. The authors of the 2010 pilot described its effect sizes as equal to or greater than those seen in studies of valerian and in some, but not all, studies of melatonin, though considerably smaller than those of sleeping medicines and cognitive-behavioral therapy for insomnia; the effect comes through a dietary pathway, with the additional polyphenol load contributing antioxidant and anti-inflammatory effects that purified melatonin tablets do not provide.

The melatonin content of tart cherry juice is approximately 0.1-0.4 mg per 240 mL serving, well below the typical 0.5-5 mg dose used in melatonin supplementation. The mechanism may therefore involve more than simple melatonin delivery, including modulation of tryptophan metabolism, regulation of the kynurenine pathway, and reduction of the low-grade inflammation that contributes to age-related sleep fragmentation.

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Inflammation and Joint Pain

Tart cherry anthocyanins inhibit cyclooxygenase-1 and cyclooxygenase-2 activity in vitro at concentrations achievable through dietary intake, and a 2023 meta-analysis of 21 randomized trials found a small reduction in serum C-reactive protein (about 0.39 mg/L, moderate certainty) and in tumor necrosis factor-alpha (very low certainty), but no effect on high-sensitivity C-reactive protein or interleukin-6. This anti-inflammatory profile has been investigated as an adjunct for osteoarthritis, fibromyalgia, and chronic non-specific musculoskeletal pain.

In a 2013 crossover trial in 58 people with mild to moderate knee osteoarthritis (Schumacher and colleagues), pain and function scores (WOMAC) fell after six weeks of two 8 oz bottles of tart cherry juice a day, but the improvement was not significantly greater than with placebo; the juice did lower high-sensitivity C-reactive protein. Effect sizes are smaller than non-steroidal anti-inflammatory drugs but come without the gastric and renal liabilities associated with chronic nonsteroidal anti-inflammatory drug use. Tart cherry juice does not carry the stomach and kidney risks associated with long-term nonsteroidal anti-inflammatory drug (NSAID) use. In severe inflammatory arthritis (rheumatoid arthritis, ankylosing spondylitis), tart cherry is a dietary addition, not a replacement for disease-modifying therapy.

Tart cherry has also been studied in fibromyalgia, where the dual anti-inflammatory and sleep-promoting effects appear to address two of the principal symptom domains. Improvements in pain and sleep quality were reported in small trials, though larger studies are needed before firm clinical recommendations can be made.

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Cardiovascular and Metabolic Effects

The polyphenol profile of tart cherry overlaps substantially with that of other anthocyanin-rich foods (berries, red wine, hibiscus) and produces a similar cluster of cardiovascular and metabolic effects. Documented findings from controlled trials include:

The effect sizes are typical of food-based polyphenol interventions and complement, rather than replace, conventional cardiovascular pharmacotherapy. Tart cherry is a reasonable component of an anti-inflammatory dietary pattern in adults with metabolic syndrome, hypertension, or borderline dyslipidemia.

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Forms and Preparations

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Amounts Commonly Used

Because the active anthocyanins peak in plasma within one to two hours and are largely cleared by six hours, divided dosing produces more sustained tissue exposure than a single large dose. Taking tart cherry with or just after a meal is described as slowing gastric emptying and prolonging absorption.

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Cautions and Contraindications

Tart cherry has an excellent safety profile in dietary amounts. Important considerations include:

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Key Research Papers

The following PubMed search links provide curated entry points into the published clinical and mechanistic literature on tart cherry (Prunus cerasus). Each link opens directly in PubMed at the National Library of Medicine.

  1. Tart cherry and gout / uric acid lowering — PubMed: tart cherry gout uric acid
  2. Tart cherry and exercise recovery — PubMed: tart cherry exercise recovery
  3. Tart cherry, melatonin, and sleep — PubMed: tart cherry melatonin sleep
  4. Anthocyanins and cyclooxygenase inhibition — PubMed: cherry anthocyanin cyclooxygenase
  5. Tart cherry and osteoarthritis — PubMed PMID: 23727631
  6. Tart cherry and blood pressure — PubMed PMID: 37809623
  7. Tart cherry, inflammation, and CRP — PubMed PMID: 37809623
  8. Montmorency cherry clinical trials — PubMed: Montmorency cherry clinical
  9. Tart cherry pharmacokinetics and bioavailability — PubMed: tart cherry pharmacokinetics
  10. Cherry consumption and cardiovascular risk markers — PubMed: cherry cardiovascular risk anthocyanin

External Authoritative Resources

  1. NCCIH — Herbs at a Glance
  2. MedlinePlus — Herbs and Supplements
  3. PubMed — All research on Prunus cerasus

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Connections

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