I'm definitely sick with a cold today after landing back from HKG. I rarely get ill, but if I do, it's almost always after a long flight. I'm a big fan of Grapefruit Seed Extract for everything in life - literally, google it, it can be used for countless things. I'm currently giving myself a chug of an ounce of juice with 15 drops 3x throughout the day today and am feeling a bit better already.