The impact of Vitamin D on brain health: Can it help prevent dementia?

Vitamin D is renowned for its role in maintaining strong bones and a robust immune system, but recent research from suggests it may also play a pivotal role in preventing dementia and cognitive decline associated with aging. With over 60% of the UK population having lower vitamin D levels than recommended, understanding its potential link to Alzheimer’s and cognitive decline is crucial. This article aims to explore the findings and recommendations regarding this essential vitamin and brain health.

vitamin d

The Research Findings 

Studies have shown a significant correlation between vitamin D deficiency and an increased risk of Alzheimer’s disease. Individuals with levels below 50 nmol/L were found to have nearly three times the risk of developing Alzheimer’s. Moreover, a recent large-scale study involving over twelve thousand dementia-free individuals aged 70 and above revealed that those who supplemented with this vitamin had a 40% lower incidence of dementia.

Expert Insights

Professor Zahinoor Ismail, from the University of Calgary and the University of Exeter, highlights the potential benefits of earlier vitamin D supplementation, particularly before the onset of cognitive decline. This supports the notion that maintaining optimal levels of this vitamin could be a key factor in reducing dementia risk.

Expert Dr. William Grant, emphasises the significance of achieving a blood level of vitamin D above 75 nmol/L for overall health, including brain health. He recommends supplementation of at least 1000 to 3000iu per day during the winter months, especially for individuals with factors such as obesity, darker skin tone, and residing further north. Dr. Grant points out that the UK government’s recommended daily intake of 400iu is insufficient for optimal brain health.

Taking Action

Despite the potential benefits of vitamin supplementation, only 8% of UK adults take vitamin D during the winter months. To address this, has initiated a research project to measure blood vitamin D levels using a home test kit, along with a free online Cognitive Function Test. This research aims to establish the ideal vitamin D levels necessary to safeguard against dementia.

Understanding the critical role of this supplement in brain health is essential for maintaining cognitive function and potentially reducing the risk of dementia. With easily accessible supplementation options and the opportunity to participate in ongoing research, individuals can take proactive steps towards preserving their cognitive well-being.

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