Barlowe's Herbal Elixirs now offers a high purity D-Aspartic Acid. D-Aspartic Acid may cause your body to increase testosterone production and enhance performance, and it may also increase Nitric Oxide levels. It works in the brain to increase hormone release. It may also build up in the testicles, alleviating a rate-limiting step of testosterone synthesis.The Certificate of Analysis (COA) of this particular batch is shown above. ***These vegetable-derived capsules (Vegan, Kosher and Halal certified) are filled on slow speed equipment and only pure, unadulterated herbal extract is contained in the capsules. There are no magnesium stearates, fillers, gelatin, silicates, gluten, corn, wheat, rice, yeast, starch, titanium dioxide, artificial colors, artificial flavors or preservatives. Capsules produced with high speed equipment in herbal and dietary supplement "factories" generally contain several other ingredients, including powdered lubricants called STEARATES (which can greatly diminish an herb or supplement's absorption into the body). Check their labels! Barlowe also still bottles his products in glass as he believes chemical vapors can vent from plastic containers and contaminate the contents and that glass is better for the environment.