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You know those road map-looking veins on big body builders? L-Arginine. It's the vascularity supplement. It's a vaso-dilator. When you use it pre-workout, you get rock-hard, massive pumps. And your veins stand out.
What it is
L-Arginine is a naturally-occurring amino acid. It's one of the 20 most common amino acids.
What it does
You can read a fairly clinical description on Wikipedia, if you're into that kind of stuff. What bodybuilders know is L-Arginine gives them that super-full feeling in the muscles when they train hard. Almost every "pump" supplement contains L-Arginine, and typically as the main ingredient.
So, why supplement with L-Arginine? Try it for one workout, and you will see why. Not "see" as in "understand" but "see" as you'll be looking at why. In addition to seeing vascularity like you've never had before, you can feel the difference when you do the last reps or last sets. The pump can be pretty incredible.
That pump you feel is blood entering the muscle. Blood carries nutrients in and waste out.
Don't overdo the L-Arginine. You will get only so much pump and only so much vascularity. With L-Arginine, you will get as much vascularity as your body is capable of. Exceeding the recommended dose won't make your body capable of more vascularity. It's like you can open a 4 inch valve to a max of 4 inches. You can't open it 6 inches by turning the handle more once it's fully open.
You can stack this with a preworkout supplement like beta-Alinine. Typically, you would take beta-Alanine (typically with creatine) 45 minutes to an hour before training, and the L-Arginine 15 minutes prior. This will give you a hard pump along with a hard workout. So you really get the blood moving through those muscles.
It's worth noting that successful bodybuilders don't pop a few L-Arginine capsules, work out, then go scarf down hamburgers and fries. Pay attention to your total program. There is no magic bullet; you need the whole arsenal.
L-Arginine free form amino acid from Twin Lab helps your body make nitric oxide, which helps muscles grow and gives you those massive pumps. 500mg, 100 servings. 100 caps. Ground delivery is 1 or 2 business days to most USA locations. More Info