I take omega3 fish oils & ginkgo. I'm not sure they qualify as enhancements as much as supplements giving me essential 'stuff' to make my brain work as it is supposed to rather than how it does on my junk diet.

"Odd. I've been seeing a lot more spam in the last week or so - obvious spam that really should have been picked up by Gmail's filter."

+1

I've felt at times that my GMail acct must be hosted on some long forgotten server that never gets updated spam profiles!

That said, they certainly do catch a lot of spam as well.