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According to this at least 5k to 50k daily appears to be safe:

https://pubmed.ncbi.nlm.nih.gov/30611908/#:~:text=In%20summa....

Not sure what happens if you eat 10 mushrooms though

Per 100g was the amount, I think. Need to eat a decent quantity at that rate.

In many countries, the standard of care for low vitamin D is a bolus dose of 60K IU once a month is perfectly fine. It's only a problem if you were eating this much every day.

When it's from food the tolerance is much higher. It's a bigger danger when taking supplements.

Is it? Interesting.