The colour of a ripe cherry is doing more work than aesthetics. The deep red comes from a class of plant compounds called anthocyanins, part of a wider family known as polyphenols. There are roughly 8,000 polyphenols in the plant kingdom and they exist for the plant's benefit: protection against UV, oxidative stress, and microbial attack. But humans have been eating them for as long as humans have eaten plants, and the research over the last twenty years suggests our brains are not indifferent to them.
A polyphenol, structurally, is a molecule built around multiple phenol rings. The relevant subgroups for cognition are flavonoids (which include anthocyanins, flavanols, and flavones), phenolic acids, and stilbenes (resveratrol is the famous example). Each subgroup has slightly different chemistry, but they share a few features: they're antioxidant, they tend to be anti-inflammatory, and many of them, surprisingly, cross the blood-brain barrier in small but measurable amounts. The clinical evidence has firmed up considerably in the last few years.
A 2025 systematic review and meta-analysis in GeroScience pooled 59 randomised controlled trials of anthocyanin supplementation and found a statistically significant improvement in global cognition compared with controls, particularly in studies running 12 weeks or longer. A 2022 meta-analysis in Molecular Nutrition & Food Research, covering dietary flavonoids more broadly, came to a similar conclusion: berries (which are high in anthocyanins) produced some of the most consistent cognitive effects across age groups.
None of the effects are huge in absolute terms. These are modulators, not pharmaceuticals, but they're consistent, and they show up across multiple independent trials. Cherries specifically have done well in this literature. A 12-week randomised trial published in 2018 gave 49 older adults with mild-to-moderate Alzheimer's disease 200ml of tart cherry juice daily and found measurable improvements in verbal fluency, short-term memory, and long-term memory compared to a control juice. The effect sizes were modest, but the population was already cognitively impaired, which is the harder context to show benefit in.
A separate strand of research, from Louisiana State University and elsewhere, has found that tart cherry juice taken twice a day improved sleep duration in older adults with insomnia by an average of around 90 minutes. The proposed mechanisms include both small amounts of melatonin in cherries themselves and increased availability of tryptophan, the serotonin precursor.
Why might polyphenols affect the brain? Three plausible mechanisms, with varying degrees of evidence behind them. First, vascular. Polyphenols, particularly flavanols (found in cocoa, tea, apples), have well-documented effects on endothelial function, the lining of blood vessels, and on cerebral blood flow.
A 2023 review in the British Journal of Nutrition concluded that habitual flavonoid intake was associated with better cardiovascular outcomes, with effects mediated partly through nitric oxide signalling. The brain depends entirely on its blood supply, and anything that improves vascular function tends to help cognition over the long run. Second, anti-inflammatory. Chronic low-grade inflammation is a recurring villain in the cognitive-decline literature. Polyphenols downregulate several inflammatory pathways, including NF-κB and COX-2 signalling. The effect is mild compared to anti-inflammatory drugs, but the exposure is daily and lifelong if these compounds are part of your diet. Third, direct neuroprotection. Some polyphenols, particularly anthocyanins and the metabolites the gut microbiome produces from them (urolithins from ellagitannins, for instance), appear to influence neurotrophic signalling: pathways involved in neuron survival and growth. Most of this evidence comes from animal models and cell culture, and it's important to be honest that the human translation is still being worked out. The 2024 Frontiers in Aging Neuroscience review of this evidence was cautiously optimistic but flagged that we need longer human trials to know what's clinically meaningful.
The food-based dose matters. The doses used in the cognitive trials are roughly equivalent to the polyphenol content of a serving of berries, a couple of cups of tea, or a square or two of dark chocolate, daily. You don't need extracts. You need consistency. A 2024 review in Nutrients pointed out that polyphenol intake in typical Western diets has fallen because of the move away from whole fruit and toward processed foods. Most adults in the UK consume well below the levels associated with cognitive benefit in the trial literature.
This is where COG's Cherry Cola flavour fits the science rather than just the marketing. Real black cherry juice (7%), with its anthocyanin profile intact, in a daily-drinkable format, paired with the rest of the COG cognitive blend: lion's mane, ginseng, ginkgo biloba, choline, magnesium, a full B vitamin complex, vitamin C, vitamin D, and zinc. The cherry isn't there for retro nostalgia. It's there because the molecules in it have been measured, repeatedly, in human cognitive trials, and the direction of effect has held up.
The colour of food is rarely accidental. The pigments that make cherries, blueberries, and blackberries dark are also the compounds that make them interesting beyond taste. Worth knowing what you're eating.
