Before you reach for an energy drink the next time you are looking for extra pep in your step, read the label. Many energy-boosting beverages contain massive amounts of sugar, and most are not regulated by the FDA. They could include proprietary blends of herbs and supplements in undisclosed amounts. One energy drink could contain the same amount of caffeine as five cups of coffee. That is a whopping dose of caffeine and could have severe consequences to your health.

Most energy drinks list 100–300 milligrams of caffeine per serving, although those amounts may not be 100 percent accurate. Keep in mind that one can or bottle may contain more than one serving. It’s also easy to lose count of caffeine consumption when you may have already consumed caffeine in other beverages. Up to 400 milligrams of caffeine per day is considered safe for most adults. Excessive caffeine intake can cause heart palpitations, tremors, panic attacks, and anxiety.

Caffeine isn’t the only concern. Energy drinks contain other stimulants that can impact your heart health. Drinking just one energy drink can narrow your arteries. These popular drinks may also raise your blood pressure and heart rate, which can greatly increase the risk of heart attack and stroke. This is especially dangerous for those with underlying health issues.

Here are some healthier ways to recharge your batteries:

Get plenty of sleep.
Try to get enough sleep whenever possible, so you don’t become fatigued or sleepy during the day.

Drink lots of water.
Being dehydrated can make you tired. Be sure to drink water throughout the day.

Exercise.
Regular workouts or walks can raise your energy levels and keep you alert.

Lower your stress.
Feeling stressed drains your battery. Try yoga, meditation, or spending quality time with friends and family to calm your mind and raise your spirits.

Sources: Heart.org, MayoClinic.org, NIH.gov, ClevelandClinic.org