Product Description
Cramping at mile 10 isn't bad luck, it's bad preparation. You've probably felt a calf seize at the worst possible moment, reached for whatever was in your pocket, and finished the day swearing you'd find something that actually works. Here's what most athletes don't realize: cramp prevention has more to do with the nervous system than electrolytes, and most fueling brands don't address it at all.
Cramp Relief That Actually Works
CrampFix uses a fast nervous-system reflex, not electrolyte replacement. The strong sour flavor activates sensory receptors in your mouth and throat that override the misfiring motor neurons causing your cramp, with relief typically arriving in 30 to 60 seconds.
Every Format, One Pack
CrampFix for cramp prevention and rescue, Fuel X and Fuel X PRO for hydration and endurance fueling, and Gel X Pro for late-session caffeine — all four product types in one pack so you know what works before it costs you a finish.
Informed Sport Certified
Every CrampFix product is third-party batch-tested for banned substances under Informed Sport certification, the same standard required by Olympic and professional athletes. It's why the Wallabies, Springboks, and UK Cricket and Football teams use Fixx as their cramp protocol.
Fuel X, Fuel X PRO, and Gel X Pro all use a dual-source carbohydrate blend of glucose and fructose, absorbed through two separate intestinal pathways simultaneously. That means your muscles can access up to 90 grams of carbs per hour, roughly 50% more than single-sugar fuels, without overwhelming your gut at race pace. Fuel X PRO adds amino acids on top, making it the call for longer efforts and back-to-back training days.
Before your workout: Take a CrampFix shot 5–10 minutes out if you know a muscle tends to cramp, or carry one in your jersey for mid-effort rescue.
During your effort: Mix Fuel X or Fuel X PRO in your bottle for sessions longer than an hour. Take a Gel X Pro late in the effort when you need a caffeine push.
Pro tip: Test every format at different intensities across multiple sessions, so race day is never a first-time experiment.
Fixx Nutrition is one of the most-trusted endurance brands, favored by triathletes, ultra-runners, and gravel cyclists who cite genuinely fast cramp relief, gut-friendly hydration, and clean flavors that don't fatigue over long sessions.
Performance, Fixed.
What's in the Fixx Nutrition Tryout Pack?
- 2 x CrampFix shots
- 2 x Gel X Pro Gels
- 1 x Fuel X Endurance Drink Mix
- 2 x Fuel X PRO Amino-Acid Drink Mix
Flavors may vary.
Always Happy Promise: Don't like a product? Tell us within 30 days of receipt and we'll make it right and make you happy. Here at The Feed, we want you to love your experience and the sports nutrition products you purchase. If, for any reason, you are not satisfied with your nutrition specific purchase, tell us.
We do not accept returns on food items that have been opened, but we will issue a store credit if you are unsatisfied. In the event of a return, you must first contact us before sending back a return shipment.
Consumable products over $40 receive a 50% store credit. This includes specialty nutrition products such as ketones or supplements/vitamins.
Fixx Nutrition Tryout Pack FAQ's
Everything you need to know about Fixx Nutrition Tryout Pack.
CrampFix works through a neuromuscular reflex, not by replacing electrolytes. The strong sour flavor of the shot is believed to activate sensory receptors in the mouth and throat that send a signal through the nervous system, overriding the misfiring motor neurons causing the cramp. The result is cramp relief in roughly 30 to 60 seconds — far faster than any oral electrolyte product can be absorbed and distributed. CrampFix can be taken before a workout to pre-empt a known cramping pattern, or mid-effort to stop a cramp that has already started.
Fuel X is Fixx Nutrition's base endurance drink mix, providing dual-source carbohydrates (glucose and fructose) plus electrolytes for sessions up to about 90 minutes. Fuel X PRO adds amino acids to that same carb-and-electrolyte base, making it the better choice for longer efforts, back-to-back training sessions, or athletes who want endurance fueling and muscle support in a single drink. Both products are caffeine-free.
Yes. All CrampFix products carry Informed Sport certification, meaning every batch is third-party tested for banned substances. Informed Sport is the same testing standard required by Olympic and many professional sports organizations. The certification is why national rugby programs including the Wallabies and Springboks, plus UK Cricket and Football teams, use CrampFix as part of their cramp-management protocol.
CrampFix can be taken either way. Use it as a preventive 5 to 10 minutes before a workout where you know a particular muscle group tends to cramp, or take it mid-effort the moment you feel a cramp starting. Because CrampFix works through a fast nervous-system reflex rather than electrolyte absorption, relief typically arrives in 30 to 60 seconds whether you are using it preventively or reactively.