Glutamine is the most abundant amino acid in our body. You need to train hard, but intense exercise can deplete our bodies of up to 50% of its glutamine. Using supplemental glutamine can help protect muscle from being burned as fuel. Our exclusive glutamine provides unmatched recovery and immune-boosting benefits. Our Vegetarian sourced fermented Glutamine is micronized for the highest solubility and uptake. Tested to USP pharmaceutical purity. Zero calories.