[cykros]

Even then, it's often not fresh. Real wasabi should be generally consumed within 30 minutes of being ground/grated, before it loses its flavor.

You can absolutely buy some wasabi powder that is made with up to 50% real wasabi on Amazon fairly cheaply, but what you're tasting is still going to be the horseradish. They're basically just selling you the discarded remains of wasabi that isn't actually any good anymore. Still safe to consume, but stale, essentially.