Can't say whether it "works" or not, but I can attest that Korean Ginseng has a good amount of NO2 in it, and at times when I've taken high dose Ginseng for short periods I've certainly noticed much more "pump", especially in my biceps. The NO2 is the current explanation as to why ginseng was often used traditionally for erectile dysfunction - the NO2 works in a similar way to Viagra.
If you're medical profile allows, and you're aware of the potential side effects of ginseng supplementation, this may be a cheaper way to experience the same thing.
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