Try to get your level of vitamin D level to 50 ng / dl which will give your immune system and boost because it is more like a wellness hormone than a vitamin. (grassfedgirl.com)
Vitamin D is fat - soluble and is actually more like a hormone than a vitamin, regulating hundreds of different pathways in your body. (mindbodygreen.com)
Every cell in your body has a receptor for D, which makes it more like a hormone than a vitamin. (mindbodygreen.com)