Nitric Oxide (NO) Boosters.

Most NO boosters have one thing in common: their active ingredient is arginine. However, they usually contain a whole host of ingredients that bump up the effectiveness of L-Arginine. Nitric oxide, a gas produced naturally in the body, is responsible for numerous processes, but the most important for bodybuilders is vasodilation: NO causes the smooth muscle cells of blood vessels to dilate, allowing more blood to flow through. The more blood flow, the more oxygen, nutrients and anabolic hormones your museles can get to fuel workouts, repair post-workout damage and ultimately grow.

NO-boosters are mainly used by avid weight-lifters and body builders to achieve more "pump" (blood vessel dilation causing more blood flow to muscles). Personally, I take little to no NO boosters for my regimen. Sometimes, the creatine compound I drink has 1 gram of L-Arginine (NO booster). I haven't really been able to tell the difference when I've used it. If you are really enthusiastic about about beginning a strict training regimen, I recommend you try this a 2 months after implementing whey-protein, casein protein, glutamine, and creatine into your nutrition. In the meantime, more blood flow can be achieved through pre- and post- workout stretching, and great lifting technique.

Creatine.

Creatine isn't a vitamin, mineral, or hormone. It is a naturally occurring amino acid that is found in your body (amino acids are the building blocks of proteins). By consuming meats and fish as well as dairy products, egg whites, nuts and seeds we acquire most of the Creatine in our system.

Although the human body stores high amounts of Creatine in the muscles to enhance recovery and power, it's difficult to maintain this level while lifting solely by food intake. Thus Creatine supplements have become a staple in the fitness community.

Supplementing Creatine in your diet will aid your muscle recovery and add power to your workouts. I add 5g of Creatine to my protein shake before every workout.