Uhh...I would stay far away from products promising to deliver a punch "equivalent to 6 energy drinks."
A cup of joe is no big deal, but these crazy energy products are not doing you service. For sustained energy I eat/drink a fast acting high quality protein source such as Whey as well as a slow metabolizing protein such as Casein (keeps me going for 7 hours). Roughly 40% is protein blend, and other 40% is unrefined carbohydrates derived from low glycemic index sources such as oats, wheat, and barley. Low GI carbs keep my energy level sustained all day long and don't allow me to crash - most younger people are probably hypoglycemic like me so this also helps stabalize my blood sugar level. I also eat 20% fats for sustainable energy - composed of Medium Chain Triglycerides (MCT oil), monoglycerides, and diglycerides, flax seed oil. Adequate amounts of B6 and B12 will keep energy going, and aid in metabolizing amino acids from protein. How do I do all this you ask????? Look into a carefully engineered meal replacement product
No caffeine, no crazy energy suppliments, just efficient use of dietary energy!