This l-arginine product is the result of the work of long-time anti-aging crusaders and biochemists, Durk Pearson and Sandy Shaw. Our extensive use of this product in hundreds of people has yielded mostly positive results. Its principal advantage is modest cost for the quantity of product provided (probably the most amount of l-arginine for the least amount of money) and its ease of use. Most people just add a level tablespoon to about 1/2 cup cold water. Beware that this, along with most other l-arginine products, can cause loose stools that may require a temporary reduction in dose. Also note that an occasional person senses the taste of fish with l-arginine products, Powermaker in particular. In this case, mixing with a small quantity of juice may be helpful, e.g., orange, cranberry, or pomegranate. Note that Powermaker contains stevia for sweetness.