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The C5 clinic uses Adipose fat derived stem cells, Embryonic stem cells are iirc the only ones that have actually been shown to have any effect, with Adipose derived ones being completely unproven to work at all. Maybe Japan has laws regarding the use of embryonic stem cells? He was probably told to get stem cell treatment, found the C5 clinic offering it, and because of local regulation been effectively swindled by an alt medicine clinic.