This is easily the most obvious proof that a peptide or small molecule works. I sit down with a double espresso and do my 5 amino shot first thing in the morning. Before that double espresso is empty I already feel ready to conquer the day. I used to have three of these coffees and within two hours I was angry and miserable. Now I have energy all day. It does not effect my sleep and the 50mg vial from Nexaph goes 20 days at the 2.5 mg I use. That's 200 days of clean energy for about what I pay for five pounds of good espresso beans. Nexaph is no joke the best price on everything they sell and I have no doubt I am getting the product I buy.