Daily Supplements May Boost Brain Function in Older Adults
A twin study found daily prebiotic and protein supplements improved memory scores in older adults, linking gut health to brain function.
A new twin study has found that daily protein and prebiotic supplements can improve memory test scores in older people, according to ScienceAlert. The research, described as a first of its kind, suggests that what benefits the aging gut may also benefit the aging brain. The findings were published in late March 2026 and add to a growing body of evidence linking gut health to cognitive performance.
Why This Matters
Cognitive decline is one of the most pressing health concerns associated with aging, and affordable, accessible interventions remain elusive. The gut-brain axis — the communication network linking the digestive system and the brain — has drawn increasing scientific attention in recent years. Per ScienceAlert, this study stands out because it used a twin design, which helps researchers control for genetic and environmental variables that typically complicate nutrition research. That methodological rigour lends the findings additional credibility.
Twins Study Reveals Memory Score Improvements
The study found that older participants taking daily protein and prebiotic supplements showed improvements in memory test scores, according to ScienceAlert. By using twins as subjects, researchers were able to isolate the effects of the supplements more precisely than conventional study designs allow. The research suggests the supplements — described as relatively inexpensive and widely available — may offer a practical, low-barrier option for supporting cognitive health in aging populations. Scientists report the gut microbiome appears to play a meaningful role in mediating these effects.
What This Means for Older Adults
For older adults and their caregivers, the findings point toward a potentially simple and affordable strategy for supporting brain health. Per ScienceAlert, the supplements involved are not exotic or costly, which could make them accessible to a wide range of people. Researchers have not yet established long-term effects or optimal dosing, and further studies are expected to follow.
The gut-brain connection is proving to be one of the most consequential frontiers in aging research. This first-of-its-kind twin study suggests that inexpensive daily prebiotic and protein supplements may offer measurable cognitive benefits for older adults — a finding that could meaningfully shape future dietary guidance.