Recent Reserch shows that 98% of the British Population suffer with a deficiency in Vitamin D3. THis is because we do not get enough sunlight in our 'diet' / lifestyles to give us what we need to be healthy. A lack of Vitamin D affects people in many ways. Depression, Osteoporosis, Insomnia are to name but a few.
Recent research shows that Vitamin D is also essential in maintaining a health immune system and so use thorough the winter months is a must.