Blackberry leaves, blackthorn berries, linden flower, or rowanberry tea for brain fog?

I think it would be difficult without lab testing. There are numerous flavonoids and other phenolic compounds that hypothetically could be relevant. Ruling out ingredients based on blends doesn't account for the differences in processing etc. Who knows what is really there without testing?

For example, rosehips are high in quercetin, but it has very low oral bioavailability. Ellagic Acid is likewise common in these sources. Urolithins (ellagic acid metabolites) and quercetin are considered phytoestrogens but their biological activity is not well characterised in humans.

"FLAVONOID AND ORGANIC ACID CONTENT IN ROSE HIPS"

"Blackberry Leaves as New Functional Food? Screening Antioxidant, Anti-Inflammatory and Microbiological Activities in Correlation with Phytochemical Analysis"

"Fruits of Polish Medicinal Plants as Potential Sources of Natural Antioxidants: Ellagic Acid and Quercetin"
Yeah I’ve basically given up trying to figure out the exact compound. Even the ones that are unique to some of the ingredients don’t have much particularly useful information on why they might be helpful.

I’m hoping I can just narrow down the ingredient that’s helpful
 
I still wonder if it could be the peppermint. For something else, I put some peppermint oil in a humidifier and it seemed to have an effect on brain fog. N=1 of course.
That’s interesting! I have other blends with even higher percentage of peppermint and don’t get a similar effect, so I’m inclined to think it’s not peppermint in my case. Though as Mij suggested it might be a combination of peppermint with something else
 
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