Dr. Matthew Loh, a pediatrician from MultiCare, says teenagers should be drinking less than 100 milligrams of caffeine a day. Energy drinks like Alani Nu have more than double that amount. With flavors like Pink Slush or Tropical Vibe, teenagers are gravitating toward energy drinks.

As energy drinks continue to grow in popularity, health experts in Fort Wayne are raising concerns about what frequent consumption could be doing to the heart. Many of

Costco Wholesale ( COST 0.60%) released a new line of energy drinks, which wasn't welcome news for Celsius Holdings ( CELH 5.56%) shareholders. The shareholder concern is warranted, as it's becoming difficult for energy-drink companies to stand out in an increasingly crowded space.

Kim Kardashian has released a new "healthy" energy drink called Update, which contains paraxanthine instead of caffeine. We asked experts about paraxanthine vs. caffeine in Update and how it stacks up against traditional energy drinks.