This supplement shouldn’t be a surprise addition to a stack designed to maximize your pump. After all, nitric oxide (NO) boosters have been hot sellers for their ability to amplify muscle pumps during workouts and boost strength and mass gains. Most of these products contain some form of the amino acid arginine, which gets converted into NO via the nitric oxide synthase (NOS) enzyme. NO dilates blood vessels, delivering more blood to your muscles while allowing more fluid from your blood to leave the vessels and enter your muscle cells for shirt-busting swells.
Today’s best NO boosters contain much more than just arginine—they also have ingredients that increase the activation of NOS, such as pycnogenol and ginseng. Look for products that supply 3-5 grams per dose of some form of arginine—such as L-arginine, arginine alpha-ketoglutarate, arginine ketoisocaproate, arginine malate or arginine ethyl ester—and take one dose 30-60 minutes before workouts.
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