With the hit of Beta Alanine, C4 energy gives you the extra boost you need to perform. Such a boost that people will wonder – is this even legal? The good news is that C4 Energy is NSF Certified for Sport – tested for 290 illegal substances. It can trigger staggering athleticism, heightened performance energy, and may even result in shattered PRs- but it's all above board. We felt the public needed to be warned about the extreme positive side effects. So, we issued a warning that also echoed the C4 packaging. A playful alert to get up and own your inner-athlete… Drink at your own risk of excellence.