This product has other ingredients apart of L-glutamine
"I've been bought this product since more than 10 years with no problem, except last 2 purchases made since last summer. I got tubs with 'flavoured' glutamine, instead of unflavoured. I've claimed Optimum Nutrition and they sent me tubs with the same batch number, that is, with the same problem. When I asked for an explanation, I got no answer. So, I'm very disappointing and don't recommend its purchase because doesn't comply what it promise."


