Wasabi improves short- and long-term memory in older people
medicalxpress.com
medicalxpress.com
"More recently, wasabi been rumored to help with cognitive abilities because of its supposed calming effect on the brain. Because of that, it is now sold as a supplement in many health food stores." (emphasis mine)
Though I'd probably trust the tablet to be real wasabi about as much as I'd trust restaurant wasabi to be real. Even if the tablets are fake, folks will just forget why they were taking it in the first place.
https://www.thewasabistore.com/shop/genuine-wasabi-powder
I think what they gave them was this:
You can sometimes find the real stuff (in root form) in Japanese grocery stores, it's just kind of expensive
Not if the results of the study are true!
Bonus: the Japanese indigo industry makes more than jeans and more than one color.