There are many supplements that claim to help with brain fog, but not all of them are backed by science.
A specific strain of Bacopa known as Acumen is a popular supplement that's been clinically shown to improve memory and cognitive function. I carry Acumen by Klaire Labs, but also carry the same product as Brain Fog Support.
Equazen PRO is another supplement that's been shown to improve cognitive function in people with ADHD.
One of the mechanisms behind brain fog is believed to be inflammation. Curcumin is one of the most researched extracts in all of nutrition science, particularly for its inflammation support. Theracurmin HP Integrative Therapeutics is the most bioavailable and well-tolerated form of curcumin that I'm aware of backed by a peer-reviewed, 3rd-party study - easily making it my go-to source.
If you're looking for supplements that can help with brain fog, these are great options to consider.