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It should also be noted that 99.9% of all wasabi in restaurants is the wrong species (horseradish), even in Japan.
Came here to say this. I wonder what would happen if these tests were conducted against the fake Wasabi.
That might be why they gave the study participants wasabi tablets:

"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.

> 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.

You can sometimes find the real stuff (in root form) in Japanese grocery stores, it's just kind of expensive

> folks will just forget why they were taking it in the first place.

Not if the results of the study are true!

And it's really hard to grow outside of Japanese shaded stream beds. A few commercial operations have cracked commercial wasabi greenhouse operations, but not many.

Bonus: the Japanese indigo industry makes more than jeans and more than one color.

Be sure to set a reminder to take your wasabi, at least until it starts working.