What IS a performance enhancer?

[jsarno]

Pain killers aren't enhancers, because they don't make you better than what you were without the pain. In fact, I have been in this situation, and even with the shot, you're still not 100%, you're more like 90-95% instead of being 75%.
But like I said, it doesn't "enhance" your talents or skills.

Here is the definition from the dictionary:
en·hance /ɛnˈhæns, -ˈhɑns/ Pronunciation Key - Show Spelled Pronunciation[en-hans, -hahns] Pronunciation Key - Show IPA Pronunciation
–verb (used with object), -hanced, -hanc·ing. 1. to raise to a higher degree; intensify; magnify: The candelight enhanced her beauty.
2. to raise the value or price of: Rarity enhances the worth of old coins.