Yeah, it's fat soluble so you can take too much (but you'd have to take a ridiculous amount).

The normal doctor prescription to increase levels is a 50k pill once a week for a couple months. The previous recommended level was 20ng/ml, but they increased it to 30ng/ml.

When I got tested mine was 11ng/ml (and this is in the sunny bay area). To have the recommended value from normal sun exposure you'd need face/legs/arms exposed to sunlight for ~30-45 minutes a day which most people don't get. It's very hard to increase D from food.

I'm also not sure how they determine the recommended amount and there seems to be a ton of pseudoscience around all of this stuff so it's hard to tell what's true.

Yah like doing 25k a day. That could cause problems.

Surprisingly few problems. Wife has been doing 80k a day for the past few years and have help tremendously with her auto immune decease.

If you're going to do high doses, stay away from anything with significant amount of calcium in your food (dairy, nuts etc)

80,000 IU is a terrifying number for daily intake. Did you mean 8k and not 80k?

I meant 80k. See studies from Dr Cicero Coimbra for more background if you're interested.