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Nutrition & Diet

Vitamin D, fish oil and glucosamine linked to faster cognitive decline: what the evidence showsAging & Longevity
Sep 27, 2026

Vitamin D, fish oil and glucosamine linked to faster cognitive decline: what the evidence shows

Vitamin D, fish oil, and glucosamine are familiar supplements, especially among older adults. In 2026, however, all three have been pulled into an uncomfortable scientific question: could a supplement taken for health actually become less helpful, or even harmful, as the brain ages? Several new studies have reported associations between supplement use and faster cognitive […]

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