wasabi extract aids memory
Wasabi is a traditional Japanese spice/condiment (a variety of horseradish) which is sufficiently common in Japan that researchers could survey patients for whether or not they used wasabi, and blind-study test their memories to get the data they needed -- a sort of "natural experiment", as such things are known. The beneficial effects have been traced to a naturally occurring sulfoxide -- similar to the cancer-fighting chemical(s) in broccoli and other cruciferous vegetables.
lutein zeaxanthin aids memory
This was a serendipitous discovery -- people taking lutein for eye problems discovered their memories were improving. That's similar to how Viagra was discovered, FWIW. Lutein is found naturally in the human brain, so harmful effects seem minimally plausible. 
ETA: I just learned broccoli contains a compound known as glucoraphanin, which decomposes to produce
6-(methylsulfinyl) hexyl Isothiocyanate (aka sulforaphane, or (4-methylsulfinylbutyl isothiocyanate)) the SAME active ingredient in wasabi !
https://pmc.ncbi.nlm.nih.gov/articles/PMC12156470/
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