Vitamin D Plus DHA May Support Cognitive Function in Older Adults with Mild Memory Decline
This 12-month clinical trial followed 360 older adults with mild cognitive impairment (MCI), a condition marked by noticeable but non-dementia-level memory and thinking changes. Participants were randomly assigned to take vitamin D (800 IU/day), DHA (1 g/day), a combination of both, or a placebo.
Researchers tracked cognitive performance using a standardized IQ-based test and measured blood markers linked to a cell-damage process called pyroptosis, which involves inflammation-related proteins (IL-1β, IL-18, NLRP3, GSDMD, and caspase-1). After a year, all three active treatment groups showed improved cognitive scores and lower levels of these inflammatory markers compared to placebo.
Notably, the combined vitamin D and DHA group showed the largest improvements across multiple cognitive subtests, including verbal and performance IQ measures. Statistical modeling suggested that the reduction in one specific protein, GSDMD, was connected to the improvement in overall cognitive scores, hinting at a possible biological pathway linking inflammation control to brain function.
What this means for you
For older adults concerned about mild memory and thinking changes, this study suggests that combining vitamin D and DHA may offer more noticeable cognitive benefits than either nutrient alone, possibly by influencing inflammation-related processes in the body. As with all early research, these findings are promising but not conclusive, and should be discussed with a healthcare provider before making supplement decisions.
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Start the ALP ProtocolThis summary is for educational purposes only and is not medical advice. Always talk to your healthcare provider before making changes to your supplement routine.