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kinda, but the system is not perfect.

https://en.wikipedia.org/wiki/Autoimmune_regulator

oversimplifying but in every person there are tradeoffs about attacking things inside yourself (viruses, cancer, etc) and outside things (parasites, bacteria, etc) and your genetics influences this. See the old Th1/Th2 balance

anyway it was probably a typo on his part, he's such a sleepy guy..

Thank you doctor Gray.

how about allergies?...ive seen recent tatooees and that shit aint good man

Some people have allergies to some inks. You definitely want to check with your artist and check what inks they use before getting a piece. There's still an outside shot that you'll end up with an allergy, which can be made worse with sun exposure.

It's a risk. A very small one. You gotta figure out your tolerance for risk.