advertises to be all natural and it's trying to reach a new audience of gamers. >> hi, i'm going to hit the delay play. >> 20-year-old doug martin who is sponsored by g fuel, plays video games up to 12 hours a day. >> when i am playing in a big tournament makes me feel alert and confident. i never had a crash or jitter. >> doctors say it has the same amount of caffeine as other energy drinks. >> this energy drink that's proclaiming to be natural and healthy has taken out of it the chemicals and sugars but it's incorporated what they're calling herbals or natural substances. these actually interact with the caffeine and can be more dangerous. >> reporter: we reached out to gamma labs for comment. the company saying the ingredients in g fuel are blended at ratios to maximize focus and concentration, among energy drinks, we are one of the healthiest choices on the market and as with any caffeinated product, moderation is advisable. some energy drink manufacturers have come under attack for marketing to children causing