I take 50,000 IUs of D2 once a week. I heard about the vitamin K being needed for the D to be utilized.

These two vitamins work synergistically to ensure that calcium obtained from food is deposited in the bones and not in the arteries. Vitamin D increases calcium levels in the body, while vitamin K helps the body use calcium by shuttling it to your bones. Taking vitamin D without enough vitamin K can cause an increase in calcium levels without the ability to use it effectively, which raises the risk of depositing calcium in arteries and soft tissue. Therefore, it is beneficial to take vitamin D3 and K2 together for optimal bone and cardiovascular health.

That's a little disturbing. At least vitamin K is in cheese. I do love cheese.

Don't bother with probiotics, your body is better at sorting out it's own gut biome.

I had noticed probiotics seem useless, although eating my own lactobacillus ferments seems useful for IBS.

And I know whole food vitamin sources are supposed to be better than junky multis but either the RDAs are full of shit or our food just isn't that nutritious anymore but you can't hit the RDA with whole foods and still consume a reasonable amount of food.

Have you noticed any benefits from vitamin E? I used to take it, at least the one form, but I never noticed a difference.