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Evidence-Based Supplement Research
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New evidence

Blood orange trial found no cognitive boost overall — but higher blood carotenoids linked to slower decline in older adults with a key Alzheimer's gene variant.

This is among the first solid RCT data on blood orange for cognition, and it came up null for the average participant — the promising signal appeared only in a genetic subgroup, which means it's a preliminary lead, not a recommendation.

The MIND trial tested whether higher carotenoid levels (from foods like blood orange) affect cognitive decline over 3 years in 442 older adults. Overall, the intervention didn't improve global cognition. However, among carriers of the APOE ε4 gene variant — which raises Alzheimer's risk — those with higher blood carotenoids declined more slowly. For people without the gene, the link was weak or nonexistent.

Where this fits in the evidence

This is among the first studies we've indexed on Blood Orange for Improved Global Cognition — treat it as an early signal until more research accumulates.

The study

Apolipoprotein E ε4-dependent associations between carotenoids and cognitive decline: Findings from the MIND (Mediterranean-DASH Intervention for Neurodegenerative delay) randomized controlled trial.

  • Randomized Controlled Trial (RCT)
  • n = 442
  • 2025-11
  • The American journal of clinical nutrition
More on Blood OrangeMore on Improved Global Cognition

This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.

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