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I take it, for the healing effect. I can't say I notice any effect on my brain. But I can always double up on it! Creatine moves energy around in the body and is found in all animals, but in no vegetables. Plants don't need it. It gives your brain (etc, etc) more available energy than doesn't require oxygen to use - it's an ATP transporter. With creatine, you skin and muscles can help you think, by doing the hard work of supplying energy.

I got calcium oxalate kidney stones after taking creatine. Worst pain in my life, by far. Had to go to the emergency room. I'll spare you the details except to say it was not a fun time. After I stopped taking creatine, I stopped getting kidney stones.

Your link answers your question: "Vegetarian supplementation with creatine seems to be especially beneficial as they appear to have lower average body stores, since meat is a primary source of dietary creatine."