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Energy tonic drink (taurine tonic)
A small single-serving tonic drink sold in Japan as a designated quasi-drug (指定医薬部外品), typically containing taurine, B-group vitamins, and often caffeine as registered active ingredients; formulations vary by product.
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In Japan this is a designated quasi-drug (指定医薬部外品), a regulated category distinct from ordinary soft drinks and energy drinks; it contains registered active ingredients and may contain caffeine. Formulations vary, so check the label.