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I've read that you should take K2 if you take D3. You might want to research that. Also 500 IU of D3 is really low.

I think that's equal to about 5 minutes of sunlight exposure, so almost nothing

Nope; see https://ods.od.nih.gov/factsheets/VitaminD-Consumer/

Don't trust the NIH with your health. They're the reason the mass majority of Americans are deficient in vitamin d, potassium, magnesium and a bunch of other vital vitamins/minerals, primarily due to faulty research done 50 years ago and never updated.

Humans spent thousands of years out in the sun on a daily basis growing crops and hunting. They never got a vitamin D overdose and were in fact much healthier than you and I.

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