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Mercola has a good article (link below) but he wants your email before you can read it. So:

Story at-a-glance

If you take supplemental vitamin D3, you also need to be mindful of taking extra vitamin K2 and magnesium

It’s important to increase your vitamin K2 intake when taking high-dose supplemental vitamin D to avoid complications associated with excessive arterial calcification

You need 146% more vitamin D to achieve a blood level of 40 ng/ml (100 nmol/L) if you do not take supplemental magnesium, compared to taking your vitamin D with at least 400 mg of magnesium per day

Vitamin D improves magnesium absorption, but taking large doses of vitamin D can deplete magnesium, as magnesium is required in the conversion of vitamin D into its active form

Combined intake of both supplemental magnesium and vitamin K2 has a greater effect on vitamin D levels than either individually. You need 244% more oral vitamin D if you’re not concomitantly taking magnesium and vitamin K2

https://articles.mercola.com/sites/articles/archive/2022/01/11/vitamin-d3-k2-and-magnesium.aspx

Mercola has a good article (link below) but he wants your email before you can read it. So: Story at-a-glance If you take supplemental vitamin D3, you also need to be mindful of taking extra vitamin K2 and magnesium It’s important to increase your vitamin K2 intake when taking high-dose supplemental vitamin D to avoid complications associated with excessive arterial calcification You need 146% more vitamin D to achieve a blood level of 40 ng/ml (100 nmol/L) if you do not take supplemental magnesium, compared to taking your vitamin D with at least 400 mg of magnesium per day Vitamin D improves magnesium absorption, but taking large doses of vitamin D can deplete magnesium, as magnesium is required in the conversion of vitamin D into its active form Combined intake of both supplemental magnesium and vitamin K2 has a greater effect on vitamin D levels than either individually. You need 244% more oral vitamin D if you’re not concomitantly taking magnesium and vitamin K2 https://articles.mercola.com/sites/articles/archive/2022/01/11/vitamin-d3-k2-and-magnesium.aspx

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From a random doctor on the net

"Even if you live in an area such as Pennsylvania where you get little strong sun in winter, adequate exposure during the rest of the year will allow your body to stockpile enough “D” to last you through the gray winter months. So, someone like you who has fair skin, burns easily and lives in Pennsylvania would be advised to spend 20-30 minutes in the sun with your arms and legs exposed (not your face) between the hours of 11 a.m. and 3 p.m. two to three times a week from March through May and September through October but only 15-20 minutes in July and August when the sun in strongest. If you remain outdoors longer than the specified time, apply sunscreen. (Don’t even try to get sun time from November through February; in your area, you won’t get enough UV to help, and you’ll probably get pretty cold outside with bare arms and legs."

as always YMMV and this is not medical advice.