From http://drgominak.com/vitamin-d-hormone.html 2015?
B12 deficiency and iron deficiency are common secondary deficiencies (of vitamin D deficiency) that also affect sleep. Vitamin B 12 deficiency results because there are Vitamin D receptors in the stomach cells that make “intrinsic factor”. Intrinsic factor is the chemical that binds to B 12 in our diet and allows us to absorb it.
When the D is so low that the intrinsic factor production also becomes low we are less able to absorb B12 from our food.
I believe B12 also helps produce normal sleep. Iron is a cofactor in making dopamine, one of the chemicals that runs the timing and paralysis of sleep, so when D, B12 and iron deficiency all exist together the sleep becomes especially bad. Those two additional deficiencies usually mean that the D has been low for many years. Ask your doctor to check your B12 and iron level when you check the D for the first time. The B12 level for normal sleep is above 500. (Again you want to know the number). If the B12 blood level is below 500 I recommend a pill of B12 of 1000 mcg/day. Shots are not better than the pills and it will be absorbed as long as the D dose is increased at the same time.
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