Not who you're replying to but https://www.nature.com/articles/s41398-019-0515-5 from my other comment seems relevant. There are many, curious what apple will link

"Current evidence supports the finding that omega-3 PUFAs with EPA ≥ 60% at a dosage of ≤1 g/d would have beneficial effects on depression." https://www.nature.com/articles/s41398-019-0515-5

Is this considered brain boosting?

I don't think so, I would consider "brain boosting" something that makes the brain of an healthy person perform better at certain tasks, not something that improves it for people with a disease.

I'm curious as to what papers mention this! Quickly pulling up one related appears to clearly support EPA omega 3 supplementation being a beneficial tool to help with depression.

https://www.nature.com/articles/s41398-019-0515-5