The production of Vitamin D requires sunlight.
It is a modern fact of life that people from Northern countries do not spend enough time outdoors for their vitamin D requirements.
Taking a Vitamin D supplement is recommended by the real nutritional experts all over the world.
When we don't get enough of everything, our immune system is starving and we can't make the antibodies needed to fight off (potential) infections of one kind of nasty shirt or another.
It is a modern fact of life that people from Northern countries do not spend enough time outdoors for their vitamin D requirements.
Taking a Vitamin D supplement is recommended by the real nutritional experts all over the world.
When we don't get enough of everything, our immune system is starving and we can't make the antibodies needed to fight off (potential) infections of one kind of nasty shirt or another.