Krestin for cancer treatment

Visiting Osaka in a few days
Apologies in advance if this post is not allowed here
Any ideas how to buy this?

[4-6] Polysaccharide-K (PSK) or krestin, from the mushroom T. versicolor, is an approved mushroom product used for cancer treatment in Japan. PSK is a proprietary formulation from the Kureha Corporation.

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