Giving 4-5g of di-arginine malate per serving, this is the best bulk arginine product available. In order to get the best out of , they used the di-arginine malate, and give you 10g of the product. It is unflavored and tastes a bit like pool-water (chlorine). Pumps were quite good, however the taste and lack of other compounds made this only score a 4. But, to take before workout and before bed, one can see good gains with this product.