Taking 2 grams of L-glutamine in water on an empty stomach (as directed) caused me to be nauseous, dizzy and anxious. Is this a normal side effect of glutamine?
Glutamine is a naturally occurring amino acid and is generally safe at the dose you used and even several times higher. However, as noted in the "Safety Issues" section of our Glutamine article, people who are sensitive to monosodium glutamate (MSG -- a food flavoring agent) should use glutamine with caution, as the body metabolizes glutamine to glutamate. The most common side effects reported with MSG are headache and nausea and only occur when it is taken without food.
More about the safety and therapeutic uses of glutamine are found in the Glutamine article.