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Published on: 7/21/2026
What is the COSMOS trial and what did it show?
The COSMOS trial (Cocoa Supplement and Multivitamin Outcomes Study) was a large randomized clinical trial that evaluated whether daily cocoa flavanol and multivitamin supplements could support cardiovascular health and cognitive function in older adults. Key findings suggest cocoa flavanols may reduce cardiovascular death risk, while daily multivitamins showed measurable benefits for memory and slowing age-related cognitive decline.
If you're weighing supplements to address specific health concerns, it's worth understanding the underlying symptoms first. Supplements can support wellness, but they aren't a substitute for identifying what's actually driving fatigue, memory changes, or heart-related symptoms. Taking a free, instant, online symptom check can help you clarify possible causes, understand which specialist to consult, and make informed decisions about your next steps—before spending money on products that may not target your real needs.
Reviewed for medical accuracy: 07/20/2026
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The COSMOS trial, or the Cocoa Supplement and Multivitamin Outcomes Study, is a research project designed to explore the effects of cocoa flavanols and multivitamins on health outcomes. Specifically, the trial looked at how these supplements might help with heart health and brain function.
Cocoa Flavanols: The trial found that cocoa flavanol supplementation may help in the prevention of cardiovascular diseases. This suggests that consuming cocoa flavanols could be beneficial for heart health.
Multivitamins and Brain Function: The study also explored the impact of multivitamins on cognitive health. The results indicated that multivitamins might have a positive effect on cognitive function, potentially helping with memory and brain health.
Overall, the COSMOS trial provides evidence that both cocoa flavanols and multivitamins could play a role in improving heart and brain health. However, while these findings are promising, they should be considered as part of a broader approach to health that includes a balanced diet and regular exercise. If you're experiencing concerns about your cardiovascular or cognitive health, take our free AI symptom checker to better understand your symptoms and next steps.
(References)
Sesso HD, Manson JE, Aragaki AK, Rist PM, Johnson LG, Friedenberg G, et al. (2022). Effect of cocoa flavanol supplementation for the prevention .... The American journal of clinical nutrition, 35294962.
Baker LD, Manson JE, Rapp SR, Sesso HD, Gaussoin SA, Shumaker SA, & Espeland MA. (2023). Effects of cocoa extract and a multivitamin on cognitive .... Alzheimer's & dementia : the journal of the Alzheimer's Association, 36102337.
Rist PM, Sesso HD, Johnson LG, Aragaki AK, Wang L, Rautiainen S, et al. (2022). Design and baseline characteristics of participants in the .... Contemporary clinical trials, 35288332.
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