This sounds like one of those typical, clever internet discoveries or social media clicks!

It’s very likely that wasabi seeds or wasabi spheres are incorporated into the cardboard core of the toilet paper roll by some Japanese manufacturers – or perhaps microcapsules containing wasabi/tea extract.

The surprising explanation behind it:

Odor and mold control: The pungent allyl isothiocyanate from wasabi (or catechin from green tea) has strong antibacterial and antifungal properties. In the humid environment of a bathroom, these small capsules prevent the toilet paper roll from becoming musty or attracting bacteria.

Seed paper for planting: In some eco-friendly products, it’s actually plant seeds (like herbs or cress). When the toilet paper roll is empty, you don’t throw away the cardboard core, but plant it directly in the soil – the cardboard serves as biodegradable fertilizer.

Or are you referring to a specific viral life hack or a particular product where the little beads serve a completely different purpose?