Perque Endura/PAK Guard is a multi-support supplement for digestive health, mental clarity and stamina. I offers relief for people who may be experiencing fatigue. Glutamine is a building block for muscle, tissue, and enzymes needed for repair growth and maintenance of cells. Boosts immune system by fueling immune cells to fight pathogens and infections. Recommended use: Take 3 capsules on an empty stomach upon rising and 3 capsules before bed or as directed by a health professional. Plus, take 3 additional capsules prior to exercise. Endura-PAK Guard Facts: 3 capsules contain: L-glutamine (free form) 1,500 mg PAK (pyridoxyl alpha-ketoglutarate) 500 mg Magnesium (as C16 and C18 alkyls) 13 mg Rice flour (organic) 90 mg Vegetable capsules 219 mg from whole, untreated palm fruit and leaf Other Ingredients: None.