Is garlic good or bad?

I've always considered garlic good, i placed it on my Acne as a teenager, i swallowed some to help clean GI, and i put it on bites, and i heard it was anti-cancer.

Then I watched a video of Dr Beck, that talked about Colloidal Silver and blood electrification. He said to not eat garlic at all, that garlic kills brain cells, slows down cognition and thus people that eat a lot can be hot-headed/easily agitated.

So is garlic good or bad for me (my blood, GI, brain, skin/hair, mind)?
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