I live in Moscow, last winter we had only few hours of sunlight in December. Two months ago I went to test Vitamin D and got <10 ng/ml which is extremely low de

I live in Moscow, last winter we had only few hours of sunlight in December. Two months ago I went to test Vitamin D and got <10 ng/ml which is extremely low deficiency, currently doing around 8000ME daily. Reading: - Holick MF, Binkley NC, Bischoff-Ferrari HA, Gordon CM, Hanley DA, Heaney RP, Murad MH, Weaver CM; Endocrine Society. Evaluation, treatment, and prevention of vitamin D deficiency: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2011 Jul;96(7):1911- 30. doi: 10.1210/jc.2011-0385. Epub 2011 Jun 6. - Guidelines for preventing and treating vitamin D deficiency and insufficiency revisited. J Clin Endocrinol Metab. 2012 Apr;97(4):1153-8. doi: 10.1210/jc.2011-2601. - Vitamin D deficiency: a worldwide problem with health consequences. Am J Clin Nutr. 2008 Apr;87(4):1080S-6S. - Vitamin D deficiency in the Middle East and its health consequences. Clin Rev Bone Miner Metab 7:77–93 - Vitamin D supplementation guidelines Pawel Pludowski - Treatment of hypovitaminosis D with pharmacologic doses of cholecalciferol, oral vs intramuscular; an open labeled RCT. Zabihiyeganeh M1, Jahed A, Nojomi M.