Will spell out the brief details first, more to come. Was working with this stuff for a prolonged period of time... Lots of corals, scrubbing, etc. etc. etc. After about 30 minutes of use - Cold like symptoms. Nose, cough, sneezing. Ok... Who knows. After about 45 min/hour- Throat started getting tight/swollen and lots more coughing. Mario and I were both working on this stuff and the symptoms all occurred at about the same time for both of us. Seems to be the same thing that happens if you work with bleach in an enclosed area... (stupid, yes) but the only way I know is because it happened to an unknowing family member when I was growing up. Someone trying to be helpful when they had no previous cleaning experience... That said - No warning labels on the bottle. It's not bathroom cleaning stuff but if it has something that can become harmful with prolonged exposure, this absolutely has to be disclosed. Only reason I'm using it now is because of the sample from last BAYMAC. Still think it's a great product and works well... However, strongly advise using with caution particularly because of the swap coming up and people may be exposed to this stuff for longer than normal times.