Yes, black cherry juice contains melatonin, though the amounts are small. Sweet cherries (the category black cherries fall into) contain roughly 10 to 20 nanograms of melatonin per gram of fruit. That’s a measurable amount, but it’s tiny compared to a typical melatonin supplement, which delivers 1 to 5 milligrams per dose. To put it in perspective, you’d need to consume an enormous quantity of cherry juice to match even a low-dose supplement.
Sweet Cherries vs. Tart Cherries
When people talk about “cherry juice for sleep,” they’re almost always referring to tart cherry juice, specifically from Montmorency cherries. This creates real confusion, because black cherries are sweet cherries, a different species entirely. Sweet cherries (Prunus avium) and tart cherries (Prunus cerasus) both contain melatonin, but in different concentrations.
Sweet cherries, including black cherries, contain 10 to 20 nanograms of melatonin per gram. Tart cherries contain 2.1 to 13.5 nanograms per gram. So sweet cherries actually tend to have slightly higher melatonin concentrations on average. However, nearly all the clinical research on sleep has been done with tart cherry juice, not sweet or black cherry juice. That distinction matters if you’re choosing a product based on the science.
What the Sleep Research Actually Shows
Several clinical trials have tested tart cherry juice for sleep quality, and the results are modestly positive. In one study, adults over 65 with insomnia drank 240 ml (about 8 ounces) of tart cherry juice twice a day for two weeks. Another trial gave healthy volunteers aged 18 to 40 a smaller dose of 30 ml of tart cherry juice concentrate twice daily for seven days. Both studies used placebo-controlled crossover designs, meaning participants served as their own comparison group, which strengthens the findings.
These studies generally found small improvements in sleep duration and quality. But here’s the important nuance: researchers don’t believe the melatonin content alone explains the effect. The amounts of melatonin in cherry juice are simply too low to account for meaningful changes in sleep. Tart cherries are rich in other compounds, including procyanidins and other plant chemicals that may influence sleep through different pathways, such as reducing inflammation or affecting how the body processes tryptophan, an amino acid the brain uses to produce serotonin and, eventually, melatonin.
No comparable clinical trials have been conducted specifically on black cherry juice and sleep. If you’re buying black cherry juice hoping for the same benefits seen in studies, know that those results came from a different type of cherry.
How Dietary Melatonin Compares to Supplements
The melatonin in cherry juice is what researchers call “dietary melatonin,” and it behaves differently from popping a supplement. A standard melatonin pill contains anywhere from 1,000,000 to 5,000,000 nanograms. An 8-ounce glass of black cherry juice might contain a few thousand nanograms at most. Your body does absorb melatonin from food, but the dose from cherry juice is orders of magnitude smaller than what you’d get from a supplement.
This doesn’t mean cherry juice is useless for sleep. It just means the mechanism probably isn’t as simple as “cherry juice gives you melatonin.” The combination of plant compounds working together may be what produces the modest sleep benefits seen in trials.
Choosing and Using Cherry Juice
If you want to try cherry juice as a sleep aid, look for 100% tart cherry juice with no added sugar, since that’s the form tested in research. Avoid cherry juice cocktails or blends, which are diluted and loaded with extra sweeteners that can interfere with absorption. Black cherry juice products are widely available, but they’re typically made from sweet cherries and haven’t been studied for sleep.
The dosing used in studies varied. Some used 8 ounces of regular juice twice a day (once in the morning, once one to two hours before bed). Others used just 1 ounce of concentrate twice daily. If you go with a concentrate, a little goes a long way.
One thing to keep in mind: cherry juice contains sorbitol, a natural sugar alcohol found in stone fruits. Most people handle it fine, but it can cause bloating, gas, or diarrhea in people who are sensitive to it. Cherry juice also has natural sugars that add calories, roughly 25 to 30 grams of sugar per 8-ounce glass depending on the brand. Drinking 16 ounces a day, as some studies used, means taking in a significant amount of sugar, which is worth factoring into your overall diet.