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I will do 10,000 IU a day to load up for a week or two, no problem. If you are white-white and live in a place with a decent winter, I don't see any problem with that level. I will usually do 5,000 IU as a minimum maintenance level. In the summer when I am getting a good spot of sun, I may cut back to 5,000 IU once every 2-3 days. But come autumn, I'll usually do a week or so at 10k daily, and then drop it back to 5k.

I used to be a big fan of supplementation generally. Now I am fairly limited in terms of what I think is worthwhile.

I do Zinc, Vitamin C, Vitamin D, Vitamin E, and Iodine. Sometimes I supplement Magnesium before sleep, or use Epsom salts in bathwater.

Vitamin D3 really requires Vitamin A as a cofactor, but instead of supplementing the latter, I eat liver once per week from locally raised animals I know are healthy. I have a farmer friend who is usually prepared to give liver away. People really should be getting animal-sourced Vitamin A.