Supplements for Athletes: What Actually Works and What's a Waste

The supplement industry is full of promises, but most products don't deliver. Only a handful of supplements have strong evidence supporting their use for athletic performance.

This guide cuts through the noise and tells you what actually works.

The Supplement Hierarchy

Tier 1: Strong Evidence (Consider Using)

• Creatine monohydrate
• Caffeine
• Protein powder
• Carbohydrate supplements

Tier 2: Moderate Evidence (May Help)

• Beta-alanine
• Sodium bicarbonate
• Beetroot juice / nitrates
• Vitamin D (if deficient)

Tier 3: Weak Evidence (Probably Skip)

• BCAAs (if eating adequate protein)
• Glutamine
• HMB (maybe for beginners/elderly)
• Most "pre-workout" blends

Tier 4: No Evidence / Waste of Money

• Testosterone boosters
• Most "proprietary blends"
• Fat burners
• Muscle "optimizers"

Tier 1 Supplements

Creatine Monohydrate

What It Does:

• Increases phosphocreatine stores in muscles
• Enhances high-intensity exercise capacity
• Supports muscle growth and strength gains
• May have cognitive benefits

Who Benefits:

• Strength and power athletes
• Team sport athletes
• Anyone doing high-intensity exercise
• Possibly endurance athletes for sprint finishes

Dosing:

• Loading phase: 20g/day for 5-7 days (optional)
• Maintenance: 3-5g daily
• No need to cycle
• Take anytime—consistency matters more than timing

What to Buy:

• Creatine monohydrate (the most studied form)
• Skip fancy forms (HCL, ethyl ester)—no better than monohydrate
• Look for "Creapure" if you want quality assurance

Side Effects:

• Water retention (1-3 lbs initial)
• No evidence of kidney damage in healthy individuals
• Occasional GI discomfort (spread dose throughout day)

Caffeine

What It Does:

• Reduces perceived exertion
• Enhances focus and alertness
• Improves endurance performance
• May enhance power and strength output

Who Benefits:

• Almost all athletes
• Especially endurance athletes
• Anyone needing mental focus

Dosing:

• 3-6mg per kg body weight
• 60-90 minutes before performance
• Example: 150 lb (68 kg) person = 200-400mg
• Start lower if caffeine-sensitive

Sources:

• Coffee (~95mg per 8 oz)
• Caffeine pills (precise dosing)
• Pre-workout supplements (check dose)
• Energy drinks (often with added junk)

Considerations:

• Tolerance develops—consider cycling
• Don't use late in day (affects sleep)
• Some people are slow metabolizers (genetic)
• Test in training before competition

Protein Powder

What It Does:

• Convenient protein source
• Supports muscle protein synthesis
• Aids recovery

Who Benefits:

• Anyone struggling to hit protein targets
• Athletes with high protein needs
• For convenience and timing

Types:

• Whey protein: Fast-absorbing, complete amino acids, most studied
• Casein: Slow-absorbing, good before bed
• Plant-based: Pea, rice, hemp—often need blends for complete aminos

Dosing:

• 20-40g per serving
• 1.6-2.2g protein per kg body weight daily (from all sources)
• Post-workout timing isn't magical—total daily intake matters more

Notes:

• Whole food protein is equally effective
• Supplements are for convenience, not magic
• Quality varies—look for third-party testing

Carbohydrate Supplements

What They Do:

• Provide quick energy
• Fuel during exercise
• Support recovery

Types:

• Sports drinks (6-8% carbohydrate)
• Energy gels (20-25g carbs)
• Energy chews
• Maltodextrin/dextrose powder

Who Benefits:

• Endurance athletes (events 60+ minutes)
• Athletes with multiple games/sessions per day
• Anyone doing prolonged high-intensity exercise

Dosing:

• During exercise: 30-90g per hour depending on duration
• Recovery: 1-1.2g per kg body weight within 2 hours

Tier 2 Supplements

Beta-Alanine

What It Does:

• Increases muscle carnosine levels
• Buffers acid buildup during high-intensity exercise
• May improve performance in 1-10 minute efforts

Who Benefits:

• Middle-distance athletes
• Team sport athletes
• High-intensity interval training

Dosing:

• 3-6g daily
• Split into smaller doses (1.5g) to avoid tingling
• Takes 4+ weeks to build up

Side Effects:

• Paresthesia (tingling sensation)—harmless but uncomfortable
• Reduced by splitting doses

Sodium Bicarbonate (Baking Soda)

What It Does:

• Buffers lactic acid
• May improve high-intensity performance (1-7 minutes)

Who Benefits:

• Middle-distance runners
• Swimmers
• Rowers
• Combat sport athletes

Dosing:

• 0.3g per kg body weight
• 60-90 minutes before exercise
• Can cause significant GI distress—test carefully

Caution:

• GI issues are common and can be severe
• Practice in training first
• May not be worth it for many athletes

Beetroot Juice / Nitrates

What It Does:

• Increases nitric oxide production
• May improve oxygen efficiency
• May benefit endurance performance

Who Benefits:

• Endurance athletes
• May help with high-altitude performance
• Potentially team sport athletes

Dosing:

• 400-500mg nitrates
• 2-3 hours before exercise
• Concentrated beetroot shots are easiest
• Regular intake may be more effective than acute dosing

Notes:

• Effects may be reduced in elite athletes
• Can turn urine/stool red (harmless)
• Avoid mouthwash before taking (blocks conversion)

Vitamin D

What It Does:

• Supports bone health
• May affect muscle function
• Immune system support

Who Benefits:

• Anyone deficient (very common)
• Athletes in northern latitudes
• Indoor athletes
• Those with limited sun exposure

Dosing:

• Get tested first
• If deficient: 2,000-5,000 IU daily
• Maintenance: 1,000-2,000 IU daily
• Take with fat for absorption

Notes:

• Many athletes are deficient
• Won't improve performance if not deficient
• Get levels checked before supplementing

What to Skip

BCAAs (Branched-Chain Amino Acids)

The Claim: Enhance muscle building and recovery

The Reality:

• If you eat adequate protein, BCAAs are redundant
• Whole proteins contain BCAAs plus other amino acids
• BCAAs alone may actually impair muscle protein synthesis
• Save your money and eat protein

Exception: Possibly useful if training fasted or on very low protein diet (rare)

Glutamine

The Claim: Boosts immune function, enhances recovery

The Reality:

• The body produces enough glutamine
• Oral supplementation doesn't effectively increase muscle levels
• No evidence of performance benefits
• Possibly helps gut health in extreme endurance (very limited evidence)

Testosterone Boosters

The Claim: Naturally increase testosterone, build muscle

The Reality:

• No legal supplement significantly raises testosterone
• Any increases are within normal fluctuation
• If it worked, it would be banned
• Complete waste of money

Fat Burners

The Claim: Accelerate fat loss

The Reality:

• Mostly caffeine plus other stimulants
• Any effect is marginal at best
• Many contain sketchy ingredients
• Diet and exercise matter far more

Most Pre-Workouts

The Reality:

• Often proprietary blends with unknown doses
• Caffeine is usually the only active ingredient that works
• Many contain ineffective ingredients at low doses
• Often loaded with artificial sweeteners and fillers

Better Option: Caffeine pills or coffee plus creatine

Supplement Safety

Third-Party Testing

Why It Matters:

• Supplements aren't FDA-regulated
• May contain banned substances
• Doses may not match labels
• Contamination happens

Look For:

• NSF Certified for Sport
• Informed Sport
• BSCG (Banned Substances Control Group)

For Competitive Athletes:

• Only use third-party tested products
• One contaminated supplement can end your career
• "Natural" doesn't mean safe

Red Flags

• Proprietary blends (hidden doses)
• Claims that seem too good to be true
• Testimonials as evidence
• "Clinically proven" without citations
• Secret formulas
• Unrealistic before/after photos

Building Your Supplement Stack

For Strength/Power Athletes

1. Creatine monohydrate (5g daily)
2. Protein powder (as needed for convenience)
3. Caffeine (before training/competition)
4. Vitamin D (if deficient)

For Endurance Athletes

1. Carbohydrate supplements (during long sessions)
2. Caffeine (before competition)
3. Protein powder (for recovery convenience)
4. Possibly beetroot juice (before key sessions)
5. Creatine (may still benefit)

For Team Sport Athletes

1. Creatine monohydrate
2. Caffeine (game day)
3. Protein powder (convenience)
4. Carbohydrates (during competition if needed)

Minimum Effective Stack

1. Creatine monohydrate (best bang for buck)
2. Protein powder (if needed)
3. That's it—everything else is marginal

The Bottom Line

Most supplements don't work. The ones that do—creatine, caffeine, protein, carbohydrates—are cheap, well-studied, and boring. Fancy marketing doesn't mean better results.

Before supplementing:

1. Get your diet right first
2. Sleep and training trump all supplements
3. If you're eating well, supplements are marginal gains
4. Use third-party tested products if competitive
5. Don't waste money on unproven products

Supplements can help at the margins. Creatine and caffeine are the most reliable performance enhancers. Everything else is either situational or hype. Spend your money on good food and quality training instead.