MSG gives plenty of side effects (http://www.buzzle.com/articles/monosodium-glutamate-side-effects.html), not all of them desirable. (Hey, you asked.) Personally, I don't think glaucoma is a good risk for a little delicious flavor.

There are plenty of brands of this stuff, including Goya Sazón (http://casualkitchen.blogspot.com/2008/10/why-you-should-always-read-ingredient.html).