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I am a chemical engineer. The plastic bottle for the DMSO is a number 7 plastic called polycarbonate. This plastic is incompatable with DMSO as DMSO can dissolve some of the plastic or components in the plastic and take this plastic into your body and deposit it there causing long term problems. The only safe plastics are number 1, 2, 4, 5 or glass. Do not use this product on or in the body!