>>49041
The levels of vitamin D in milk are nowhere near what the body actually requires for optimum health.
>>49047
This works, but vitamin D is synthesized by exposure to sunlight so going out covered in warm clothes won't do much good.
In fact it might be better to get lights for your home which emit a sunlight-equivalent level of UV - that way you can turn the heating on, strip naked, and synthesize vitamin D while sitting at your computer.