Some people have an allergic reaction to the vegetable glycerin I think. Or the propylene glycol. Both are safe for most people though. We've been using them in medical nebulizer solutions for like 70+ years.
Some people have an allergic reaction to the vegetable glycerin I think. Or the propylene glycol. Both are safe for most people though. We've been using them in medical nebulizer solutions for like 70+ years.