Product review (1 stars): poison!
It made my 3yr old twins really sick from when it ran in their nursery.  My son's breathing changed soon after I started adding this to their humidifier.  Took him to urgent care and his white blood cell count was double what an adult would be if they had an infection, so waaaaay higher than normal for a child.  They thought he had pneumonia and his check X-rays didn't show pneumonia, but that he was fighting off somthing really strong.  Both my children slept in our room for 2 nights with no humidifier (it was in their nursery) and they felt better after 24 hours. It wasn't until tonight that I linked the cause.  I went to put them both back in their nursery and I went to fill the humidifier tank again, adding 1 cap per gallon of water, placed the water container in the tub and filled the tank.  I grabbed the water tank at the top where my 4 fingers dipped into the water and after 2 minutes I noticed those same fingers burning like I had my hand over a lit stove.  Then I read the back of the bottle and it's nothing but poison and tells you to wear gloves when handling and don't INHALE or handle.  So why would you put it in your humidifier water tank if you can't inhale it?!?!  WORST EVER!!!!  my fingers have been burnig for hours after dipping in vinegar to neutralize.  Not worth it!!!!  Too much poison in this product.