Supplements for Performance: What Works and What to Avoid

Introduction to Sports Supplements

Dietary supplements for exercise and athletic performance come in various forms, including pills, powders, and liquids. They are marketed to improve strength, endurance, efficiency, and training tolerance. However, it's essential to understand that a nutritionally adequate diet and sufficient hydration are critical for anyone to perform at their best. Supplements are meant to add to that foundation, not replace it.

According to professional guidance, proper nutrition and changes in habitual diet should be considered first before using supplements to enhance performance. This food-first approach aligns with the reality that whole foods provide a complex mix of nutrients that supplements cannot fully replicate.

• Dietary supplements include vitamins, minerals, herbs, amino acids, and other products.
• Evidence supports a food-first philosophy: get essential nutrients from food before considering supplements.
• Supplements are not required to prove safety or efficacy before they are marketed in the United States.

Sources: Office of Dietary Supplements, National Institutes of Health, National Athletic Trainers' Association (NATA)

Creatine: The Gold Standard?

Creatine monohydrate is one of the few supplements with strong evidence for enhancing high-intensity, short-duration activities. It is often considered a 'gold standard' because of the extensive research and consistent benefits shown in strength and power sports.

A typical protocol for creatine loading is 20 grams per day for five days, followed by a maintenance dose of 3-5 grams per day to keep muscle creatine levels elevated. This approach is well-supported and widely used to maximize muscle creatine saturation.

• Creatine monohydrate is safe for most people when taken at recommended doses.
• Creatine helps support repeated high-intensity efforts, which can translate to better strength training adaptations.
• Consult a healthcare provider before starting any supplement, especially if you have kidney or liver conditions.

Sources: British Journal of Sports Medicine (PMC)

Caffeine and Performance

Caffeine is an effective performance enhancer, particularly for endurance activities and long-duration intermittent activities, such as team sports. It also appears to benefit high-intensity efforts in some contexts.

Common effective doses are 3-6 milligrams per kilogram of body mass, consumed about 60 minutes before exercise. For example, a 70-kilogram person might take 210-420 milligrams of caffeine, roughly equivalent to 2-4 cups of coffee.

Higher doses, exceeding 9 milligrams per kilogram, do not provide additional benefits and increase the risk of side effects like nausea, anxiousness, and insomnia. Therefore, moderation is key.

• Caffeine can be consumed via coffee, tea, pre-workout supplements, or caffeine pills.
• Timing of caffeine intake can influence its effectiveness.
• Individual tolerance varies; start with a lower dose to assess how you respond.

Sources: Office of Dietary Supplements, National Institutes of Health, British Journal of Sports Medicine (PMC)

Protein Powders and Amino Acids

Protein powders are popular among athletes and gym-goers for convenience, helping to meet protein needs for muscle recovery and growth. They can be a practical way to increase protein intake, especially after exercise, but they are not inherently superior to whole-food protein sources.

Many protein supplements contain branched-chain amino acids (BCAAs) or other amino acids. However, there is little evidence that glutamine, arginine, or other amino acids improve performance when taken alone. Your body can typically synthesize these amino acids if you consume adequate protein.

Protein powders should not replace whole foods, which provide additional nutrients like iron, zinc, and B vitamins, alongside protein.

• Protein powder is a convenient way to supplement dietary protein, not a magic bullet.
• Most people can meet protein needs through food alone, as supported by sports nutrition guidelines.
• Claims about specific amino acid benefits often lack strong evidence.

Sources: Office of Dietary Supplements, National Institutes of Health

Beta-Alanine and Other Ergogenic Aids

Beta-alanine is another supplement with evidence for certain types of exercise. It may improve performance in high-intensity efforts lasting 1 to 4 minutes, but the evidence is inconsistent, and effects can vary between individuals.

Other ergogenic aids identified by the International Olympic Committee (IOC) with adequate evidence include nitrate (found in beetroot juice) and sodium bicarbonate. These may support events involving repeated high-intensity efforts or endurance, but specific protocols should be individualized, and potential side effects like gastrointestinal discomfort should be considered.

• Beta-alanine may cause a harmless tingling sensation (paresthesia) in some people.
• Caffeine, creatine, nitrate, sodium bicarbonate, and possibly beta-alanine have adequate evidence as performance enhancers.
• Always start with the lowest effective dose to assess tolerance.

Sources: Office of Dietary Supplements, National Institutes of Health, British Journal of Sports Medicine (PMC)

How to Evaluate Supplement Quality and Safety

The dietary supplement industry is not well regulated. In the United States, dietary supplements are regulated by the FDA under the Dietary Supplement Health and Education Act (DSHEA), but manufacturers are not required to demonstrate safety or efficacy before marketing. This means you cannot assume a product is safe or effective simply because it is sold over the counter.

To minimize risk, choose supplements that have been independently tested for purity and quality by third-party organizations. Programs like NSF Certified for Sport and Informed Choice are designed to assure athletes that a product does not contain banned substances or harmful contaminants.

Always evaluate a supplement for purity, safety, and efficacy before use. Consider the evidence for the ingredient, the reputation of the manufacturer, and whether it is necessary for your specific goals.

• Look for third-party certification logos on the package.
• Research the manufacturer and check for any recalls or warnings.
• Be aware that contamination can occur even in seemingly reputable brands.
• Consult a healthcare professional or sports nutritionist for personalized guidance.

Sources: National Athletic Trainers' Association (NATA), U.S. Department of Defense

Supplements to Approach with Caution

While many supplements are safe when used appropriately, others may not live up to their claims or may even carry risks. The IOC consensus statement emphasizes that athletes should not assume a product is safe simply because it is marketed over the counter.

For example, antioxidant supplements like vitamins C and E have not been shown to improve performance, and some research suggests they may interfere with exercise-induced adaptations, such as muscle growth and endurance improvements. This interference can be counterproductive for athletes.

Certain amino acids, such as glutamine and arginine, are often touted for immune support or enhancing growth hormone, but evidence for performance benefits is lacking when taken alone.

• Be wary of supplements that promise rapid fat loss or muscle gain without evidence.
• Products that are not third-party tested may be more prone to contamination with banned substances.
• Some supplements may interact with medications you are taking; always check with a doctor.

Sources: Office of Dietary Supplements, National Institutes of Health, British Journal of Sports Medicine (PMC)

Regulations and Third-Party Testing

In the United States, dietary supplements are regulated under DSHEA, which means pre-market approval is not required. The FDA can take action against products that are found to be unsafe or misbranded, but only after they are on the market. This post-market approach places the burden of safety on manufacturers and consumers.

To address this gap, third-party testing programs provide an independent check. These programs analyze products for purity, potency, and the presence of contaminants or banned substances. Choosing a product with a certification from an organization like NSF International or Informed Choice can provide greater confidence in what you are consuming.

Athletes in particular should be aware of their sport's rules on banned substances. Many sports organizations, including the World Anti-Doping Agency (WADA), do not test every supplement, but they do test athletes. If a supplement contains a prohibited ingredient, it could result in a positive doping test. Using third-party-certified products reduces this risk.

• Third-party testing does not guarantee effectiveness, but it does verify that the product contains what the label claims and is free from common contaminants.
• Review the certification's scope to understand what contaminants are tested.
• Report any adverse effects from a supplement to the FDA's MedWatch program or the product's manufacturer.

Sources: National Athletic Trainers' Association (NATA), U.S. Department of Defense