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During the winter months, here in the UK, days are short and there isn\\u2019t enough sunlight for most of us to make the vitamin D we need. Taking a tiny vitamin D supplement is a minute change that could have a huge impact on our health. Professor David Llewellyn from Exeter University explains to Michael that vitamin D helps clear abnormal proteins, such as amyloid plaques and tau, from the brain, which may help protect you from dementia. Having enough vitamin D can also boost your immune systems, making that common cold easier to recover from. It could even lift your mood! Volunteer Baljit tries making vitamin D a habit.

Series Producer: Nija Dalal-Small\\nScience Producer: Catherine Wyler\\nResearcher: Sophie Richardson\\nResearcher: Will Hornbrook\\nProduction Manager: Maria Simons\\nEditor: Zoe Heron\\nA BBC Studios production for BBC Sounds / BBC Radio 4.