Pre-workout supplements provide specific compounds and nutrients that serve to enhance your workout results. These range from stimulants for improved energy levels to other agents that improve blood flow to working muscles, which are also referred to as pump products. Black Series Turbo HP is a pre-workout pump enhancer designed to increase nitric oxide production. In turn, this may increase blood and oxygen flow to working muscles. The active ingredients include L-citrulline. The amino acid citrulline is gaining popularity as a supplement for health and exercise performance. Black Series Turbo HP products are a great addition to almost every pre workout. Essentially a pump product is going to promote blood flow or increase hydration in cells.