The Best Supplements for CrossFit, Ranked for Repeatable High-Intensity Work

How we scored

Every product below is scored on six metrics, 0-10 each, with the weighting described on how we review. The criteria specific to this category:

• Evidence for repeatable high-intensity work. The heaviest-weighted metric, and deliberately narrower than general performance. The question is whether controlled trials show a benefit to the thing CrossFit actually demands: recovering between near-maximal efforts, sustaining output in the one-to-four-minute range, and doing it again the next day. A supplement can be good for one-rep-max strength or for endurance and still score moderately here.
• Dose and form that match the studies. 5 g per day of creatine MONOHYDRATE, not an upcharge form; 3.2-6.4 g daily of beta-alanine, split to limit tingling; 20-40 g of complete protein per serving; a sodium dose in an electrolyte mix that actually reflects sweat losses rather than a token 200 mg. We mark down undersized servings and anything where the effective amount hides inside a blend.
• Label honesty and no proprietary blends. The functional-fitness shelf is the worst offender in supplements for long ingredient lists under a single combined milligram total. We reward single-ingredient products and fully disclosed amounts, and we mark down blends, filler aminos, added sugar, and 'destroy your WOD' marketing language that implies results the product has not earned.
• Third-party testing, weighted heavily because this sport tests. Supplements are not pre-approved by the FDA, and a contaminated tub is an anti-doping finding, not an inconvenience. NSF Certified for Sport, Informed Sport and Informed Choice are the only practical defense. If you compete in sanctioned competition, treat a missing certification as disqualifying regardless of how good the rest of the label looks.
• Value per training week. We cost out what a genuinely effective weekly protocol costs, not the cheapest serving printed on the label. Creatine monohydrate and beta-alanine score at the ceiling — a few cents a day for the two best-supported options in this sport — while premium electrolyte sachets and hydrolyzed isolates have to justify a much higher weekly spend.
• Does it earn its place over food, salt, and sleep? The final check. If the same result comes from salting your food properly, eating another meal with protein in it, or going to bed an hour earlier, we say so instead of selling you a tub. Two products on this page are ranked below their own category-page score precisely because they fail this test for CrossFit specifically.

What to know before buying

• Creatine is the single highest-value purchase in this sport, and it is cheap. Five grams of monohydrate daily, timing irrelevant, no loading phase required, no cycling off. The mechanism is exactly what mixed-modal training stresses: faster phosphocreatine resynthesis between hard efforts, which is the difference between holding your pace on round four and falling apart. Skip the HCl, buffered, liquid and 'advanced' creatines — none has beaten plain monohydrate head to head and all cost more per effective gram. Expect one to three pounds of water inside the muscle in the first weeks; that is the mechanism, not fat.
• Take hydration seriously and get your sodium honest. The ACSM's position stand on exercise and fluid replacement is explicit that sweat sodium concentration varies substantially between people, and that replacing sodium with fluid is what maintains plasma volume and thirst drive during prolonged sweating. If you train in a hot garage gym, sweat through a shirt in twenty minutes, leave salt crust on your skin, or train twice a day, a high-sodium mix is doing real work. If you train in an air-conditioned box for 45 minutes and salt your food normally, plain water plus a decent diet covers it and the sachets are a luxury. Be honest about which one you are before committing to a subscription.
• Beta-alanine is the most CrossFit-specific supplement here, and it needs patience. It raises muscle carnosine, which buffers the acidity that builds in efforts lasting roughly one to four minutes — which describes an enormous share of programmed metcons. The dose is 3.2-6.4 g daily for several weeks to saturate, timing is irrelevant, and there is nothing to feel on day one. Split the dose if the harmless skin tingling bothers you. Buy an unflavored tub of pure powder rather than a pre-workout that hides 1.5 g of it inside a blend at four times the price.
• Protein target first, powder second, real food before both. The ISSN position stand lands on roughly 1.4-2.0 g/kg/day for building and maintaining muscle in active people, in servings of about 20-40 g. For an 82 kg athlete that is 115-165 g a day. Hit it with meat, fish, eggs and dairy, and use a shake when the alternative is missing the target — that is the only honest reason to own one. The whole-food-first position is not an aesthetic preference here; a meal brings everything else food contains, and a scoop brings protein.
• This is YMYL territory, and the pre-workout aisle is where this sport gets hurt. Be sceptical of proprietary stimulant blends with undisclosed caffeine totals, anything marketed as a legal anabolic or testosterone booster, and SARMs sold as research chemicals — the FDA has repeatedly issued notifications about body-building products containing undeclared or hidden drug ingredients. Rhabdomyolysis, heat illness and overuse injury are the real risks in high-intensity training, and no supplement protects against any of them; scaling the workout and sleeping enough do. If you are pregnant, nursing, under 18, taking medication, or managing a health condition — kidney disease especially, since creatine raises serum creatinine readings without harming healthy kidneys — talk to your doctor first.

Our picks

#1Best overall for CrossFitBest overall for CrossFit — faster recovery between hard efforts, which is the whole sport

Optimum Nutrition — Creatine Monohydrate Powder (Micronized)

Key specs: 5 g creatine monohydrate per serving · 600 g tub · Creapure-grade micronized monohydrate · single ingredient · no loading phase required · unflavored, mixes into anything

$27.00·View on AmazonIn Stock

Pros

• The ISSN creatine position stand calls monohydrate the most effective ergogenic nutritional supplement available to athletes for increasing high-intensity exercise capacity and lean body mass
• Its mechanism is a direct match for mixed-modal training: restoring phosphocreatine between repeated short, hard efforts
• Single-ingredient label, 5 g fully disclosed, no blend and nothing to decode
• A few cents per training day, which makes it the best cost-to-benefit purchase in this entire sport
• Timing-independent, so adherence is trivial even on a two-session day

Cons

• No sport-level third-party certification at this price point — a problem if you compete in tested competition
• Micronized monohydrate still settles in water more than pricier soluble forms, which is texture, not performance
• The first-weeks water-weight gain inside muscle bothers athletes who are watching a weight class

Who this one is for

For every CrossFit athlete, from someone three months into on-ramp to a regionals-level competitor. The mechanism — faster phosphocreatine resynthesis between near-maximal efforts — maps directly onto repeated rounds and barbell cycling. The only readers who should pause are those with kidney disease, who should talk to a doctor first, and sanctioned competitors, who should buy the NSF Certified for Sport option in our creatine roundup instead.

Optimum Nutrition — Creatine Monohydrate Powder (Micronized)

Rubric score

9.3/10

• High-intensity evidence10/10
• Dose & form10/10
• Label honesty10/10
• Third-party testing6/10
• Value10/10

$27.00·View on AmazonIn Stock

#2Best electrolyte mix for heavy sweatersBest electrolyte mix for heavy sweaters — the highest honest sodium dose, with no sugar

LMNT — LMNT Recharge Electrolyte Drink Mix

Key specs: 1,000 mg sodium, 200 mg potassium, 60 mg magnesium per packet · zero sugar · 30-packet box · no proprietary blend — all three minerals disclosed by amount

$45.00·View on AmazonIn Stock

Pros

• 1,000 mg of sodium per packet is a dose that actually reflects what a heavy sweater loses, rather than the token 200 mg most sports drinks carry
• Zero sugar, which makes it usable on a low-carb or keto approach where most sports drinks are not
• All three mineral amounts are stated on the label — no 'hydration complex' hiding the doses
• Directly addresses the thing the ACSM position stand identifies as maintaining plasma volume during prolonged sweating: sodium replaced alongside fluid

Cons

• Easily the most expensive way to buy sodium — table salt and a glass of water deliver the same mineral for a rounding error of the cost
• The sodium dose is genuinely too high for light sweaters, short sessions, or anyone managing blood pressure without medical advice
• The salty-sweet flavor profile is divisive and worth buying a small box to test before subscribing

Who this one is for

For the athlete who trains in a hot garage or non-air-conditioned box, sweats through a shirt, leaves salt crust on their skin, or trains twice a day. The 1,000 mg sodium dose is also the right fit on a low-carb or keto approach, where sodium needs genuinely run higher. If you train 45 minutes in air conditioning and salt your food normally, water does the job and this is a luxury.

LMNT — LMNT Recharge Electrolyte Drink Mix

Rubric score

8.5/10

• High-intensity evidence8/10
• Dose & form10/10
• Label honesty10/10
• Third-party testing5/10
• Value4/10

$45.00·View on AmazonIn Stock

#3Best for metcon capacityBest for metcon capacity — buffering in the 1-4 minute window, which is most of what you do

Nutricost — Beta-Alanine Powder (500 g)

Key specs: Pure beta-alanine powder · 500 g tub · roughly 2-3 g per scoop · unflavored · single ingredient · GMP facility · months of servings per tub at the full 3.2-6.4 g daily dose

$19.95·View on AmazonIn Stock

Pros

• The ISSN beta-alanine position stand places the performance benefit squarely in efforts of roughly one to four minutes, which describes a large share of programmed metcons
• A 500 g tub makes the genuinely effective 3.2-6.4 g daily dose affordable — the exact point where capsule and pre-workout formats fall apart on cost
• Single-ingredient and unflavored, so you can split the dose across the day to reduce tingling and stack it into anything
• No stimulants, so it does not interfere with evening training or sleep the way a pre-workout does

Cons

• Needs several weeks of daily dosing to saturate muscle carnosine — there is nothing to feel in the first session, which is why people abandon it
• Harmless skin tingling (paraesthesia) at larger single doses is off-putting until you learn to split the dose
• No sport-level third-party certification at this price point

Who this one is for

For the athlete whose rounds die at the two-minute mark: thrusters, rowing intervals, high-rep barbell cycling, anything where the burn arrives and output falls off a cliff. This is the most CrossFit-specific pick on the page. It is the wrong purchase if your training is all heavy singles with long rests, or if you want something you can feel on day one.

Nutricost — Beta-Alanine Powder (500 g)

Rubric score

8.4/10

• High-intensity evidence9/10
• Dose & form10/10
• Label honesty10/10
• Third-party testing6/10
• Value10/10

$19.95·View on AmazonIn Stock

#4Best protein for a two-session dayBest protein for a two-session day — 25 g of complete protein that sits lightly before training

Dymatize — ISO100 Hydrolyzed

Key specs: 25 g protein / 110 cal per scoop · hydrolyzed whey protein isolate · very low lactose and fat · Informed Choice certified on listed batches

$42.48·View on AmazonIn Stock

Pros

• 25 g per scoop lands inside the 20-40 g per-serving range the ISSN position stand points at for maximizing muscle protein synthesis
• Informed Choice certification on listed batches is genuine third-party assurance — the one protein here a tested competitor can defend
• Hydrolyzed isolate strips most lactose and fat, which is why it sits lightly enough to use between sessions on a double day
• Complete protein with all nine essential amino acids and high leucine, which is what separates it from any BCAA product

Cons

• Noticeably more expensive per gram of protein than a concentrate blend, and the hydrolysis buys tolerance rather than extra adaptation
• Dairy-derived, so it is out for anyone avoiding dairy — see our plant protein coverage
• A convenience, not a performance supplement: meat, eggs and fish do the identical job for growth and recovery

Who this one is for

For the athlete doing doubles, or anyone who finishes a 6am class with no appetite and then under-eats protein for the rest of the day. The hydrolyzed isolate is specifically the pick if whey concentrate leaves you bloated going into a workout. If you comfortably hit 1.6 g/kg from food, you do not need this, and we would rather say so.

Dymatize — ISO100 Hydrolyzed

Rubric score

8.3/10

• High-intensity evidence8/10
• Dose & form10/10
• Label honesty9/10
• Third-party testing8/10
• Value7/10

$42.48·View on AmazonIn Stock

#5Best durability pickBest durability pick — the mineral hard training burns through, at a sane price

Doctor's Best — High Absorption Magnesium Glycinate/Malate

Key specs: 100 mg elemental magnesium per 2-tablet serving as glycinate/lysinate chelate (Albion TRAACS) · 240-tablet bottle · elemental dose stated on the label, not compound weight

$23.99·View on AmazonIn Stock

Pros

• States the ELEMENTAL magnesium dose, which most of the shelf hides behind the much larger compound weight
• Chelated glycinate/lysinate is well absorbed and gentle on the gut at doses where citrate and oxide become a laxative
• 240 tablets at this price is the best value per elemental milligram we track, which matters for something taken daily and indefinitely
• Addresses the sleep half of recovery, and sleep is the highest-leverage recovery variable any athlete has

Cons

• A gap-filler, not an ergogenic — nobody's performance improves from magnesium unless they were genuinely short
• 100 mg elemental per 2-tablet serving means two tablets, twice, for some people to reach a useful evening dose
• No third-party sport certification, and tablets include binders a capsule would not

Who this one is for

For the athlete training five or six days a week who sleeps badly and cramps. Magnesium is lost in sweat and under-consumed by a lot of adults, so this is gap-filling rather than performance enhancement — and the honest benefit is more likely to show up in sleep quality than in your Fran time. Skip it if you eat a lot of leafy greens, nuts and seeds and sleep fine.

Doctor's Best — High Absorption Magnesium Glycinate/Malate

Rubric score

7.6/10

• High-intensity evidence5/10
• Dose & form8/10
• Label honesty9/10
• Third-party testing6/10
• Value10/10

$23.99·View on AmazonIn Stock

#6Best joint and tissue pickBest joint and tissue pick — a real EPA+DHA dose in the form the research used

Nordic Naturals — Ultimate Omega

Key specs: 1,280 mg combined EPA+DHA per 2-softgel serving · triglyceride form · IFOS 5-star certified for purity and freshness · lemon-flavored to limit reflux

$34.20·View on AmazonIn Stock

Pros

• 1,280 mg of combined EPA+DHA per serving is a genuinely research-relevant dose, where most cheap fish oils deliver a few hundred milligrams
• Triglyceride form rather than the cheaper ethyl ester, and IFOS 5-star certification covers purity, potency and oxidation — the spec that actually separates fish oils
• The most defensible pick here for anyone who does not eat oily fish twice a week, which is most people
• Transparent labelling of EPA and DHA separately, rather than a large 'fish oil' number that tells you nothing

Cons

• No credible performance benefit — this is health and tissue durability, and we are not going to pretend otherwise
• Expensive per gram of EPA+DHA compared with eating sardines, which is the whole-food-first answer
• Fish oil causes reflux and fishy aftertaste in some people even in a flavored triglyceride form

Who this one is for

For the athlete over 35, anyone whose elbows and shoulders complain after a heavy week, and anyone who simply does not eat oily fish twice a week. This is a general-health and tissue-durability purchase that happens to matter in a sport that beats on connective tissue. It is not going to change your performance, and any product telling you otherwise is overselling.

Nordic Naturals — Ultimate Omega

Rubric score

7.4/10

• High-intensity evidence4/10
• Dose & form10/10
• Label honesty9/10
• Third-party testing9/10
• Value6/10

$34.20·View on AmazonIn Stock

Frequently asked questions