Tart Cherry for Insomnia

The trials behind tart cherry juice for sleep are small. Two pilot studies in older adults with chronic insomnia, of 15 people and 8 completers, reported less time awake at night or longer sleep. A 20-person trial in healthy adults found more total sleep time after a week.

Larger later trials did not repeat this: no effect in 44 healthy adults over 30 days, and none in 34 adults with sleep problems and overweight taking 500 mg capsules. A 2025 systematic review called the evidence limited and heterogeneous. Cognitive behavioural therapy for insomnia (CBT-I) remains the first-line treatment, and melatonin has far more trials.

Montmorency cherries contain melatonin, about 13.5 ng per gram of fresh-frozen fruit, roughly six times more than Balaton cherries (Burkhardt 2001). In 20 healthy adults, a week of concentrate raised total urinary melatonin and increased time in bed, total sleep time and sleep efficiency on actigraphy (Howatson 2012).

That amount of melatonin is tiny next to a typical supplement, so it is unclear whether it is enough to matter.

In the polysomnography pilot, the kynurenine-to-tryptophan ratio and prostaglandin E2 fell with cherry juice, and a cherry procyanidin blocked the enzyme that breaks down tryptophan in cell tests (Losso 2018). More tryptophan could, in theory, feed sleep-related pathways.

None of this shows why sleep changed in those 8 people, and the later null trials suggest the effect, if real, is small or limited to some groups.

The polysomnography pilot gave 240 mL of juice twice a day for two weeks (Losso 2018), and the first insomnia pilot used a juice blend for two weeks (Pigeon 2010). The trial that found no effect used a single 500 mg capsule an hour before bed (Tucker 2024), and the 30-day null trial used two 240 mL bottles a day (Hillman 2026).

The positive polysomnography pilot used 480 mL of juice a day, with the sugar that goes with it, and the same 480 mL a day was null in healthy adults over 30 days. The positive trial in healthy adults used a week of concentrate instead (Howatson 2012).

Pigeon and colleagues (2010) gave 15 older adults with chronic insomnia a tart cherry juice blend or placebo for two weeks each. Compared with placebo, insomnia severity and minutes awake after sleep onset fell, but sleep latency, total sleep time and sleep efficiency did not change. The authors judged the effects modest and considerably smaller than those of hypnotics or CBT-I.

Losso and colleagues (2018) randomized 11 adults over 50; 3 were excluded with sleep apnea. The 8 completers slept 84 minutes longer on polysomnography (P = 0.0182), but only one of five questionnaires improved.

In 34 adults with sleep problems and overweight or obesity, 500 mg capsules for 14 days changed no measure of sleep, including the Insomnia Severity Index (Tucker 2024). In 44 healthy adults, 30 days of juice or capsules did not change sleep time or quality (Hillman 2026).

What is missing: a properly sized trial in people diagnosed with insomnia, objective sleep measures, and follow-up beyond two weeks. A 2025 systematic review of seven studies reached the same conclusion (Barforoush 2025). For broader sleep goals, see improved sleep quality.

Tart cherry is a food, and the sleep trials did not report notable side effects in their abstracts. The main practical issue is the dose: 480 mL of juice a day carries a lot of sugar and calories. Trial results on glucose are mixed: in a 12-week trial in older adults, people drinking that amount ended with higher glucose than a sugar-matched control group (Chai 2018), while a 2022 meta-analysis of 10 trials found a slight fall in fasting glucose. People with diabetes should count the sugar or use capsules.

Insomnia that lasts months, or comes with loud snoring or gasping, deserves a medical review. In one pilot, 3 of 11 participants turned out to have sleep apnea.

No drug interaction studies exist for tart cherry. Combining it with prescribed sleep medicines has not been tested, so tell your prescriber. The juice forms add sugar that matters for diabetes treatment.