About the effect and application of arginine there are plenty of scientific papers, everyone can thereby pick the right one for him. Decisive for the effect is probably also the recommended daily intake of at least 3,000 mg. This reach is more difficult with most products on the market, these capsules but agrees the quantity and the price. I have the first box with 270 capsules now depleted almost entirely (6 pcs. Per day instead of the specified 5) and am satisfied, I feel the first positive effects on my libido, am sure that it is not placebo effect. Reorder I have already made.