One side note on D3. Anytime I removed my shirt to say mow the lawn during a sunny day, I would almost instantly turn a bright red and be sun burnt for a few days. My d3 levels were in the 20 ng/ml range. Once I supplemented with D3 and hold mine at approximately 80 ng/ml, I have not been sunburned since. I always turn a dark tan. I have not had a blistering sunburn in years.