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Lee este articuloIf you're a competitive athlete or a fitness buff, improving your sports performance is probably on your mind. Lots of people wonder if taking sports supplements could offer fast, effective results without so much hard work. But do sports supplements really work? And are they safe?

What Are Sports Supplements?

Sports supplements (also called ergogenic aids) are products used to enhance athletic performance that may include vitamins, minerals, amino acids, herbs, or botanicals (plants) — or any concentration, extract, or combination of these. These products are generally available over the counter without a prescription.

Sports supplement are considered a dietary supplement. Dietary supplements do not require U.S. Food and Drug Administration (FDA) approval before they come on the market. Supplement manufacturers do have to follow the FDA's current good manufacturing practices to ensure quality and safety of their product, though. And the FDA is responsible for taking action if a product is found to be unsafe after it has gone on the market.

Critics of the supplement industry point out cases where manufacturers haven't done a good job of following standards. They also mention instances where the FDA hasn't enforced regulations. Both of these can mean that supplements contain variable amounts of ingredients or even ingredients not listed on the label.

Some over-the-counter medicines and prescription medications, including anabolic steroids, are used to enhance performance but they are not considered supplements. Although medications are FDA approved, using medicines — even over-the-counter ones — in ways other than their intended purpose puts the user at risk of serious side effects. For example, teen athletes who use medications like human growth hormone (hGH) that haven't been prescribed for them may have problems with development and hormone levels.

Lots of sports organizations have developed policies on sports supplements. The National Football League (NFL), the National Collegiate Athletic Association (NCAA), and the International Olympic Committee (IOC) have banned the use of steroids, ephedra, and androstenedione by their athletes, and competitors who use them face fines, ineligibility, and suspension from their sports.

The National Federation of State High School Associations (NFHS) strongly recommends that student athletes consult with their doctor before taking any supplement.

How Some Common Supplements Affect the Body

Whether you hear about sports supplements from your teammates in the locker room or the sales clerk at your local vitamin store, chances are you're not getting the whole story about how supplements work, if they are really effective, and the risks you take by using them.

Androstenedione and DHEA

Androstenedione (also known as andro) and dehydroepiandrosterone (also known as DHEA) are prohormones or "natural steroids" that can be broken down into testosterone. When researchers studied these prohormones in adult athletes, DHEA and andro did not increase muscle size, improve strength or enhance performance.

The side effects of these "natural" steroid supplements like DHEA and andro aren't well known. But experts believe that, when taken in large doses, they cause effects similar to stronger anabolic steroids.

What is known is that andro and DHEA can cause hormone imbalances in people who use them. Both may have the same effects as taking anabolic steroids and may lead to dangerous side effects like testicular cancer, infertility, stroke, and an increased risk of heart disease. As with anabolic steroids, teens who use andro while they are still growing may not reach their full adult height. Natural steroid supplements can also cause breast development and shrinking of testicles in guys.

Creatine

Creatine is already manufactured by the body in the liver, kidneys, and pancreas. It also occurs naturally in foods such as meat and fish. Creatine supplements are available over the counter, and teens make up a large portion of the supplement's users.

People who take creatine usually take it to improve strength, but the long-term and short-term effects of creatine use haven't been studied in teens and kids. Research in adults found that creatine is most effective for athletes doing intermittent high-intensity exercise with short recovery intervals, such as sprinting and power lifting. However, researchers found no effect on athletic performance in nearly a third of athletes studied. Creatine has not been found to increase endurance or improve aerobic performance.

The most common side effects of creatine supplements include weight gain, diarrhea, abdominal pain, and muscle cramps. People with kidney problems should not use creatine because it may affect kidney function. The American College of Sports Medicine recommends that people younger than 18 years old do not use creatine. If you are considering using creatine, talk with your doctor about the risks and benefits, as well as appropriate dosing.

Fat burners

Fat burners (sometimes known as thermogenics) were often made with an herb called ephedra, also known as ephedrine or ma huang, which acts as a stimulant and increases metabolism. Some athletes use fat burners to lose weight or to increase energy — but ephedra-based products can be one of the most dangerous supplements. Evidence has shown that it can cause heart problems, stroke, and occasionally even death.

Because athletes and others have died using this supplement, ephedra has been taken off the market. Since the ban, "ephedra-free" products have emerged, but they often contain ingredients with ephedra-like properties, including bitter orange or country mallow. Similar to ephedra, these supplements can cause high blood pressure, heart attack, stroke, and seizures.

Many of these products also contain caffeine, along with other caffeine sources (such as yerba mate and guarana). This combination may lead to restlessness, anxiety, racing heart, irregular heart beat, and increases the chance of having a life-threatening side effect.

Will Supplements Make Me a Better Athlete?

Sports supplements haven't been tested on teens and kids. But studies on adults show that the claims of many supplements are weak at best. Most won't make you any stronger, and none will make you any faster or more skillful.

Many factors go into your abilities as an athlete — including your diet, how much sleep you get, genetics and heredity, and your training program. But the fact is that using sports supplements may put you at risk for serious health conditions.

So instead of turning to supplements to improve your performance, concentrate on nutrition and follow a weight-training and aerobic-conditioning program.

Tips for Dealing With Athletic Pressure and Competition

Ads for sports supplements often use persuasive before and after pictures that make it look easy to get a muscular, toned body. But the goal of supplement advertisers is to make money by selling more supplements, and many claims may be misleading.

Teens and kids may seem like an easy sell on supplements because they may feel dissatisfied or uncomfortable with their still-developing bodies, and many supplement companies try to convince teens that supplements are an easy solution.

Don't waste your money on expensive and dangerous supplements. Instead, try these tips for getting better game:

  • Make downtime a priority. Studies show that teens need more than 8 hours of sleep a night, and sleep is important for athletes. Organize time for sleep into your schedule by doing as much homework as possible on the weekend or consider cutting back on after-school job hours during your sports season.

  • Learn to relax. Your school, work, and sports schedules may have you sprinting from one activity to the next, but taking a few minutes to relax can be helpful. Meditating or visualizing your success during the next game may improve your performance; sitting quietly and focusing on your breathing can give you a brief break and prepare you for your next activity.
  • Choose good eats. Fried, fatty, or sugary foods will interfere with your performance. Instead, focus on eating foods such as lean meats, whole grains, vegetables, fruits, and low-fat dairy products. Celebrating with the team at the local pizza place after a big game is fine once in a while. But for most meals and snacks, choose healthy foods to keep your weight in a healthy range and your performance at its best.
  • Eat often. Sometimes people skip breakfast or have an early lunch, then try to play a late afternoon game. Not getting enough food to fuel an activity can quickly wear you out — and even place you at risk for injury or muscle fatigue. Be sure to eat lunch on practice and game days. If you feel hungry before the game, pack easy-to-carry, healthy snacks in your bag, such as fruit, trail mix, or string cheese. It's important to eat well after a workout.
  • Avoid harmful substances. Smoking will diminish your lung capacity and your ability to breathe, alcohol can make you sluggish and tired, and can impair your hand-eye coordination and reduce your alertness. And you can kiss your team good-bye if you get caught using drugs or alcohol — many schools have a no-tolerance policy for harmful substances.
  • Train harder and smarter. If you get out of breath easily during your basketball game and you want to increase your endurance, work on improving your cardiovascular conditioning. If you think more leg strength will help you excel on the soccer field, consider weight training to increase your muscle strength. Before changing your program, though, get advice from your doctor.
  • Consult a professional. If you're concerned about your weight or whether your diet is helping your performance, talk to your doctor or a registered dietitian who can evaluate your nutrition and steer you in the right direction. Coaches can help too. And if you're still convinced that supplements will help you, talk to your doctor or a sports medicine specialist. The doc will be able to offer alternatives to supplements based on your body and sport.

Reviewed by: Mary L. Gavin, MD
Date reviewed: November 2011

 
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Related Resources:
American College of Sports Medicine
This site has tips on staying safe while playing sports and exercising.
National Collegiate Athletic Association (NCAA)
The NCAA is an organization through which the nation's colleges and universities speak and act on athletics matters.
U.S. Food and Drug Administration (FDA)
The FDA is responsible for protecting the public health by ensuring the safety, efficacy, and security of human and veterinary drugs, biological products, medical devices, our nation's food supply, cosmetics, and products that emit radiation.