According to the internet, it is way higher, probably over 9000.

Edit because the comment might be to shallow for HN: I sympathize with the struggle against depression and, after first-hand experience, share the skepticism against the widespread prescription of antidepressants and the methods of evidence presented for it.

Very serious and important topic.

Regarding Vitamin D, I am also supplementing in the Winter, but I have not read the article, which says it has an estimated reading time > 10min. I use one 1000IE (0.025mg according to the package) tablet a day max.

I'll bookmark this discussion page to read TFA later maybe.

It’s important to take Vitamin D, as a fat soluble vitamin, with dietary fat during a meal. Something about bile production and absorption.

Also important to take it with Vitamin K.

There's likely significant individual variation in bioavailability. I would start with 2-5K/day, then measure and iterate.