Isopure protein is a powdered drink mix marketed as a meal replacement supposedly used by the New York Jets. One of the main ingredients of Isopure protein is L-glutamine, an amino acid which has the potential to cause some side effects.
L-glutamine is considered generally safe to use in small doses, according to rxlist.com.
Types of Side Effects
Possible side effects of L-glutamine include constipation, upset stomach and bloating, reports Physicians' Desktop Reference.
L-glutamine has the potential to decrease the effectiveness of medications used to prevent seizures, including phenobarbital, primidone, phenytoin, carbamazepine and valproic acid, according to rxlist.com. This poses a risk that seizures will return.
In patients with cancer, L-glutamine sometimes speeds up the growth of tumors, according to the University of Maryland Medical Center. Some people also experience allergic reactions to L-glutamine, causing chest pain, shortness of breath, swelling of the face and extremities, and skin rashes, cautions the Physicians' Desktop Reference.
If you are pregnant or nursing or have a history of liver disease, mania, epilepsy or are allergic to MSG, it may not be safe for you to take Isopure protein because of the L-glutamine it contains.