You have to go really overboard with vitamin D3 to take too much of it. The daily recommendations so far are underestimating it. 4000 IU should be fine for adul

You have to go really overboard with vitamin D3 to take too much of it. The daily recommendations so far are underestimating it. 4000 IU should be fine for adults. There are people that take 6000-10000 IU, but it's hard to say whether they might be suffering from some long term effects due to this. You should take vitamin K2 with D3 though. >But if you can be in the sun your skin can make vitamin D. This is harder than people say. You need UVB light to hit your uncovered skin (glass blocks it entirely). The sun needs to be above 35-50 degrees in the sky. If it's below that (like in winter or evenings) then you won't get vitamin D from it.