Ep 59, Vitamin D - The Natural Mood Booster by Chartered Psychologist, Andrew Bridgewater

Vitamin D, often referred to as 'the sunshine vitamin' is a nutrient that plays a vital role in our overall health. Getting enough Vitamin D during the long winter months can be a problem for many people.

Therefore it helps to take a good Vitamin D3 supplement.  The best I've found is produced by Igennus.com and here's a direct link which explains more about the benefits:
https://igennus.com/collections/vitamin-d3
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