Triathlon has four disciplines. Swim, bike, run, and nutrition. That last one catches people off guard because it sits outside the obvious physical demands, but anyone who has bonked at mile 18 of a marathon leg knows exactly what poor fueling feels like. Your legs stop listening. Your brain gets foggy. The finish line might as well be in another country.
Getting nutrition right means finding products that actually work for your gut, your training schedule, and the specific distances you race. A sprint triathlete has different needs than someone grinding through a full Ironman. The stores listed here cater to those differences, and each one has built a reputation among endurance athletes for reasons worth knowing.
This covers 12 online stores where triathletes can buy race fuel, hydration products, recovery supplements, and daily training nutrition. Some specialize in a single product line they have perfected over decades. Others carry multiple brands and let you compare options in one place.
All of them ship directly to your door, which matters when you train 15 hours a week and cannot spend Saturday afternoon driving to specialty shops.
| Store | Specialty | Best For | Notable Feature |
| GU Energy Labs | Energy gels, chews, hydration | Race day fuel | First major gel distributor, Ironman sponsor since 2012 |
| The Feed | Multi-brand marketplace | Comparing products, single servings | Personalized recommendations, wide selection |
| Hammer Nutrition | Complete endurance line | Long-distance athletes | 39 years, all products made in USA |
| Skratch Labs | Hydration, real food | Athletes with GI issues | Electrolyte profile matched to sweat composition |
| Maurten | Hydrogel technology | High-intensity racing | Official nutrition of Ironman Global Series |
| Science in Sport | Gels, recovery, protein | Pro-level athletes | Every batch tested for banned substances |
| Tailwind Nutrition | All-in-one fuel | Simplicity seekers | Complete calories, electrolytes, hydration in one mix |
| Näak | Cricket-based nutrition | Eco-conscious athletes | Certified B Corporation, UTMB partner |
| Clif Bar | Bars, chews, builders | Training snacks | Widely available, affordable |
| Nuun | Electrolyte tablets | Hydration focus | Low calorie, portable tablets |
| Honey Stinger | Organic fuel | Natural ingredient preference | Honey-based products |
| Precision Fuel & Hydration | Sweat testing, custom plans | Personalized hydration | Science-backed electrolyte protocols |
What Triathletes Actually Need From Nutrition
Before spending money on any store, knowing the numbers helps. For Olympic distance races, athletes should aim for 60 to 90g of carbohydrates per hour. Half-Ironman and full Ironman distances push that target to 90g per hour. Sprint races are more flexible, with 30 to 60g being sufficient if the race extends beyond an hour.
Hydration follows a similar pattern. Athletes should target 500 to 750ml of fluids per hour, adjusted for heat and personal sweat rate. A proper sports drink should contain sodium at 30 to 50 mmol/L for optimal absorption and to prevent hyponatremia, a condition where blood sodium drops dangerously low.
Body mass losses should stay under 1% during competition. That sounds like a small number, but tracking it during training reveals how much fluid different conditions and intensities pull from your body.
Recovery matters too. The 30 to 60 minutes after exercise is when muscles absorb and store nutrients most efficiently. Missing that window does not ruin your training, but hitting it consistently adds up over weeks and months.
1. GU Energy Labs
Website: guenergy.com
GU Energy Labs has been making gels since 1994, and they were the first major company to distribute energy gels widely. Based in Berkeley, California, they have expanded their product line to include energy chews, drink mixes, hydration tablets, stroopwafels, and their higher-intensity Roctane line.
Each GU Energy Gel packet contains 450mg of amino acids, 100 calories, and at least 21g of total carbs. The company recommends taking gels at transition points and every 20 to 30 minutes during bike and run segments. That timing ensures steady carbohydrate delivery throughout each phase.
GU sponsors USA Triathlon and became the first official gel and chew sponsor for Ironman in 2012. Their online store offers bulk purchasing options, subscription services, and variety packs for athletes who want to test different flavors before committing to a race day choice.
2. The Feed
Website: thefeed.com
The Feed operates as a marketplace for endurance nutrition, carrying products from dozens of brands in one place. This setup lets triathletes compare gels, hydration mixes, bars, and recovery products without visiting multiple websites or piecing together information from different sources.
What sets The Feed apart is their approach to product recommendations. Athletes can input their race distance, dietary restrictions, and flavor preferences to receive tailored suggestions. The site also features detailed product descriptions that go beyond marketing copy, with information about carbohydrate sources, electrolyte content, and intended use cases.
For triathletes who have not settled on a single brand, The Feed offers sampler packs and mix-and-match options. Shipping tends to be fast, and customer service responds to specific questions about product comparisons. The store works well for both beginners testing different products and experienced racers restocking their favorites.
3. Hammer Nutrition
Website: hammernutrition.com
Hammer Nutrition has operated since 1987, giving them 39 years of product development focused specifically on endurance athletes. The company is family-owned, based in Whitefish, Montana, and manufactures all products in the USA.
Their product philosophy centers on avoiding added sugars, artificial colors, flavors, chemicals, and preservatives. For long-distance racing, Hammer offers two powder-form fuels designed for extended efforts: Sustained Energy 2.0, introduced in 1992, and Perpetuem 2.0, which launched in 2003. Both products address the specific demands of multi-hour racing where gut tolerance becomes a limiting factor.
Hammer’s online store includes detailed guides for race fueling protocols based on distance and intensity. The site also offers free consultations with their staff, which can help athletes dial in nutrition plans for specific events. Their loyalty program provides discounts for repeat customers who settle into a consistent product routine.
4. Skratch Labs
Website: skratchlabs.com
Skratch Labs started in Boulder, Colorado, when founder Dr. Allen Lim worked as a sport scientist with a Pro Cycling Tour team. The company officially launched in 2012 after years of developing hydration formulas that professional cyclists would actually drink without GI issues.
Their electrolyte profile was built to match what leaves the body through sweat: 400mg sodium/L, 80mg potassium/L, 100mg calcium/L, and 80mg magnesium/L. Lower osmolality means faster fluid absorption and reduced risk of stomach distress, which matters during high-intensity racing when blood flow shifts away from the digestive system.
Skratch flavors their products with real fruit and skips artificial sweeteners and colors. The taste is light, designed to avoid the flavor fatigue that comes from consuming sweet drinks for hours on end. Their online store carries hydration mixes, energy chews, recovery products, and a line of real food products like rice cakes and cookies for athletes who prefer solid fuel during training.
5. Maurten
Website: maurten.com
Maurten developed their patented Hydrogel Technology starting in 2015. The technology uses a structure made from natural sources to encapsulate carbohydrates, making sports fuel easier to tolerate during high-intensity racing when the gut is under stress.
The results have been notable. Before working with Maurten, Eliud Kipchoge could absorb around 37g of carbohydrates per hour. During his sub-2-hour marathon attempt, Maurten helped increase that absorption to over 100g. Maurten is now the Official Sports Nutrition of the Ironman Global Series, fueling athletes like Lucy Charles-Barclay and Gustav Iden to world championship performances.
Hydrogel Technology uses alginate extracted from brown algae cell walls and pectin found in apples, lemons, carrots, and tomatoes. The total ingredient count is six, with no preservatives, artificial flavors, or colors. Maurten’s online store carries gels, drink mixes, and solid fuel options, though their product line is intentionally narrow compared to some competitors.
6. Science in Sport
Website: scienceinsport.com
Science in Sport has developed, manufactured, and distributed sports nutrition products since 1992. They supply more than 320 professional teams, organizations, and national teams worldwide, including over 150 professional football clubs in the UK, Europe, and the USA.
Their partnership roster includes Team INEOS, German Cycling Federation, Legion of LA, USA Triathlon, and the English Institute of Sport. This professional focus shapes their product development and quality control processes.
The SiS GO Isotonic energy gel was the first isotonic gel on the market, designed to be absorbed quickly without needing additional water. Every single batch of Science in Sport products is screened against the World Anti-Doping Agency list, with each batch receiving Informed Sport certification. For competitive triathletes concerned about contamination or banned substances, this testing protocol provides documented assurance.
7. Tailwind Nutrition
Website: tailwindnutrition.com
Tailwind Endurance Fuel combines calories, electrolytes, and hydration in a single mix. Each scoop contains 100 calories, and each packet contains 200 calories, all from carbohydrates in the form of dextrose and sucrose. These simple sugars match what the body is designed to absorb efficiently.
The electrolyte profile includes sodium, potassium, magnesium, and calcium to speed fuel absorption and replace what sweat removes. The formula enhances water absorption beyond what plain water achieves alone.
Tailwind offers two main products: Endurance Fuel for longer, sustained efforts, and Rapid Hydration for shorter or less intense workouts. Rapid Hydration contains 45 calories per serving for athletes who need electrolytes without the full carbohydrate load. Both formulas are non-GMO, vegan, and free of gluten, soy, and dairy. There is no aftertaste, and the mix does not leave residue in bottles.
8. Näak
Website: naak.com
Näak was founded by two endurance athletes seeking better nutrition with lower environmental impact. Their solution involves cricket powder, a complete protein source containing all 9 essential amino acids needed for building proteins and synthesizing hormones.
Products are formulated with a 4:1 carbohydrate-to-protein ratio, 180mg of essential electrolytes, and a short ingredient list. The environmental numbers are striking: compared to beef, crickets require 12x less feed, 2000x less water, and produce 100x fewer greenhouse gases to produce the same quantity of protein.
Näak is a certified B Corporation and serves as the official Technical Partner of the UTMB World Series and UTMB Mont Blanc Finals. Their online store carries energy bars, waffles, drink mixes, and recovery products. For athletes who factor sustainability into purchasing decisions, Näak offers a way to fuel training while reducing environmental footprint.
9. Clif Bar
Website: clifbar.com
Clif Bar produces energy bars, chews, and protein products that many triathletes use during training rather than racing. The bars provide sustained energy for longer workouts, while Bloks energy chews deliver faster-absorbing carbohydrates for race day use.
Product availability is a practical advantage. Clif products appear in grocery stores, gas stations, and outdoor retailers across the country, making restocking convenient during travel or when race week arrives faster than expected. Their online store offers bulk purchasing and subscription options at prices below retail.
The Builder’s protein bar line addresses post-workout recovery needs with 20g of protein per bar. For triathletes who train multiple sessions daily, having recovery nutrition readily available helps maintain the protein intake needed to support muscle repair.
10. Nuun
Website: nuun.com
Nuun specializes in electrolyte tablets that dissolve in water. The tablets are portable, lightweight, and eliminate the mess that powder mixes can create in gym bags or transition areas. Each tablet contains sodium, potassium, magnesium, and calcium with minimal calories.
The Sport line is designed for training and racing hydration, while the Immunity and Rest lines address recovery and daily wellness. For athletes who prefer to separate their carbohydrate and electrolyte intake, Nuun tablets pair well with energy gels that provide calories without significant sodium.
Their online store offers variety packs for testing flavors, subscription discounts, and limited edition seasonal flavors. Nuun products are vegan, gluten-free, and made without artificial sweeteners in most formulations.
11. Honey Stinger
Website: honeystinger.com
Honey Stinger uses honey as a primary carbohydrate source across their product line. Organic energy gels, chews, waffles, and bars all feature honey-based formulations that provide quick energy with a taste profile different from corn-based alternatives.
The organic certification appeals to athletes who prefer natural ingredients and want to avoid synthetic additives. Waffles have become particularly popular among cyclists and triathletes as solid fuel that goes down easily during long rides.
Their online store carries bulk options and variety packs. The waffle products require some consideration around temperature since they can soften in heat, but many athletes solve this by keeping them in bike jersey pockets rather than bento boxes that sit in direct sun.
12. Precision Fuel & Hydration
Website: precisionfuelandhydration.com
Precision Fuel & Hydration takes a data-driven approach to sports nutrition. Their sweat testing service measures individual sodium loss rates, providing specific numbers that inform hydration strategies. Athletes receive personalized recommendations rather than generic advice based on averages.
The product line includes electrolyte capsules and drink mixes at different sodium concentrations, allowing athletes to match products to their measured needs. For triathletes racing in hot conditions or those who have experienced cramping or unusual fatigue, understanding personal sweat composition can guide better product selection.
Their online store includes educational resources explaining the science behind their approach. The testing service requires either an in-person appointment at select locations or a home test kit, but the information gathered applies to product choices across brands.
Putting It All Together: Building Your Nutrition Strategy
Buying products is the easy part. Using them correctly requires practice. The golden rule among sports nutritionists is simple: nothing new on race day. Every gel, chew, bar, and drink mix should be tested during training at race intensity before appearing in your transition bag.
GI distress, dehydration, and underfueling are the most common nutrition problems triathletes face. All three can be avoided with careful planning and practice. Training provides the opportunity to learn how your gut responds to different products, carbohydrate concentrations, and timing strategies.
Start with the recommended ranges. For Half-Ironman and Ironman distances, 90g of carbohydrates per hour is the target. For Olympic distance, 60 to 90g per hour works for most athletes. Then adjust based on how your body responds during hard training sessions that simulate race conditions.
Recovery nutrition is part of the system too. That 30 to 60 minute window after training is when muscles are primed to absorb nutrients. Planning post-workout nutrition with the same attention given to race fuel helps training adaptations accumulate faster.
The stores listed here each offer something useful for triathletes at different levels and with different priorities. Some athletes will settle on a single brand and stick with it for years. Others will mix products from several stores based on what works for different race distances and conditions. Both approaches work as long as the testing happens before race day, not during it.
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