As you know, it's winter. Thanks to the support of corporate advertisements on the media, you also know that everybody gets sick during the winter and therefore you
should must buy brand-named tissues with expensive lotion inside of them. Putting those lotion smeared napkins aside, nobody wants to get sick right? Of course! You're a busy guy/gal with things to do and people to see; you don't have time for a nasty cold to punch you in your face when you least expect it. Below, I'm going to give you three "out-of-this-world" methods of boosting your immune system.
Unless they find you beyond this world.
Get Sick More Often
Don't worry, that's no typo. If you want to boost your immune system, don't fall into the social-norm of avoiding as much microbes as possible. Instead, expose yourself to as many diseases (non-fatal ones, obviously) as possible, in order to build up your passive defense. Do you enjoy sanitizing your phones and door knobs every weekend? Of course not! Just don't do it and embrace the disease! It's like taking the disease head-on, to settle the score once and for all.
Depicted: Being weak-sauce.