1. Low calcium levels (in the tissues) cause “low Vitamin D”: http://www.westonaprice.org/…/an-ancestral-perspective-on-…/
Chronic disease and/or living in low-sun-intensity areas often shows with low calcium on a hair test. This DOES NOT mean you should take Vitamin D3, it means you need more UVB exposure (sun or lamps), possibly Vitamin A, and correcting copper issues…and *possibly* more calcium.
2. Low magnesium levels (in the tissues, not blood tests) cause “low Vitamin D”: http://www.ncbi.nlm.nih.gov/pubmed/23981518
Everyone is deficient in magnesium. Everyone. BTW, Natural Calm is a joke and is best used for laxative purposes, and magnesium oxide is hardly fit to give to animals.
3. Chronic inflammation and/or occult/hidden infections causing “low Vitamin D”: http://link.springer.com/article/10.1007%2Fs00011-014-0755-z (the abstract is posted at the end of this post)
Chronic inflammation, the causes are endless. Hidden/occult infections? If you’ve had root canals, however many of those you have had, you have that many infections. That’s a starting point. Feel better in general on antibiotics, especially in ways that you don’t relate to why you were prescribed the antibiotics in the first place? You have a hidden infection(s), they lowered the load for a while, you felt better. Some of the best solutions to help people with getting enough light exposure to help their “calcium-vitamin D” metabolism in the winter months include:
- Safe & smart sun exposure as you are able
- Full-spectrum light bulbs in the home and/or office
- Full-spectrum tanning beds (if you’re into that, must say full-spectrum).