I see it's listed under antiseptics, solutions, and cosmetics. Does that mean I can use it on skin?

The product's category listing reflects regulatory classification, not a recommendation for personal skin care. While methylene blue has historical antiseptic properties, this specific VITATEKA 1% solution is described as intended for technical, laboratory, or specialist-purpose applications, such as staining or visualization. It is not formulated, tested, or marketed as a cosmetic for daily skin care, cleansing, or hydration. Using it on skin carries risks, including intense staining that may last days and potential irritation, especially for sensitive skin or near the eyes. The product notes explicitly advise to avoid contact with eyes and to check specialist literature or consult a qualified professional if unsure about suitability for your intended use. For any personal application, seeking advice from a relevant specialist is essential to ensure safety and appropriateness.