n-acetyl-cystine (NAC) - a powerful anti inflammatory and antioxidant amino acid. If you have chronic inflammation issues this is a very useful tool. It chelates heavy metals so it's important to supplement zinc/copper if you take this long term.

Black seed oil (satella nigella) - anti inflammatory, antioxidant, antiviral (contains thymoquinone), immune system booster, shortens duration of colds and flus, and has a list of other benefits that goes on and on. I take this during illness and also before and during travel as a prophylactic.