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Is vitamin D fat soluble? If so, pretty sure it needs to be consumed with fat. That's partly why it's common in milk.

It is fat soluble, but it doesn't need to be consumed with fat. It's believed that that will help improve uptake, though. (I don't, I take it in the mornings long before my first meal and that seems to be effective for me based on my test results.)

https://www.jandonline.org/article/S2212-2672%2814%2901468-3...

"The mean peak (12-hour) plasma vitamin D-3 level after the dose was 32% (95% CI 11% to 52%) greater in subjects consuming fat-containing compared with fat-free meals (P=0.003)."

It's common in milk because it helps with calcium absorption.

This is correct:

https://www.bones.nih.gov/health-info/bone/bone-health/nutri....

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