I have this vitamin D3 tablets for 5 weeks,, occupied from early February until well into March. Have taken up to 10 tablets a day. This dose is without risk. have made myself smart. Now, therefore, from the beginning of spring, I do not take more tablets. I regularly go to the air, to take small sunbathing. For the winter months, as in November, I think taking important. I get tested, inter alia, vitamin D3 recently my blood. I had a value of 25. A score of 50 would be desirable. But do not panic. Through regular sunbaths we quickly reach a "Normal value". I highly recommend this tablets that are also low in passing recommend.