Race Day Boost
Phosphate Loading System
- Optimizes aerobic capacity
- Increases endurance
- Helps reduce unpleasant "burning sensation"




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Race Day Boost greatly enhances the performance of your body’s three energy production pathways. That means, no matter what your race pace may be—low-to-moderate intensity, higher intensity/ anaerobic, or flat-out sprint—a four-day load with Race Day Boost delivers the goods to help you meet or exceed your race day expectations. Race Day Boost superbly buffers lactic acid and dramatically improves oxygen utilization, which is why it’s no surprise that, in the most extensive research to date on Race Day Boost’s primary ingredient, study subjects enjoyed a whopping 8% improvement in performance time.
Yes, sodium tribasic phosphate (also referred to simply as sodium phosphate) is remarkably safe, especially in the relatively small amounts found in Race Day Boost and Perpetuem. Sodium phosphate enjoys FDA "GRAS" (Generally Recognized As Safe) status as an emulsifying agent, Nutrients and Dietary Supplement, a sequestrant (a food additive whose role is to improve the quality and stability of the food products), and for miscellaneous use.
The LD50 of orally dosed sodium tribasic phosphate for rats (the amount of an agent that is sufficient to kill 50 percent of the rats) is 7,400 mg/kg. Translated for a 75 kg/165 lb. athlete, that would mean a dose of nearly 555 grams (555,000 mg), an astronomically high amount that no one would even conceive of trying to take. By comparison:
Every four-capsule dose of Race Day Boost contains 1,000mg of trisodium phosphate, 440mg of which is comprised of sodium. The standard loading dose protocol is four servings a day for four days, so you'll be adding 1,760mg of sodium to your daily total. Over the course of four days that's an additional 7,040mg of sodium being consumed. The majority of athletes already consume far more sodium than is necessary from their diets, so it's extremely important to lower your dietary sodium/salt intake, especially when doing a loading dose of Race Day Boost.
Yes, every Hammer Nutrition supplement is 3rd party tested in compliance with the FDA’s regulations, 21 CFR Part 111 – Dietary Supplements. All the raw materials for each supplement we produce are tested for purity, strength, identity, and integrity. In addition to raw material testing, every Hammer Nutrition supplement is also tested in every stage of production—blending, encapsulation / powder-filling, packaging components and finished goods—before being released for distribution.
Supplement Facts |
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Serving Size 4 capsules Servings Per Container 16 |
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Amount Per Serving | % Daily Value* | |
Sodium (from Trisodium Phosphate) | 440mg | 19% |
Phosphorus (from Trisodium Phosphate) | 189mg | 15% |
* The Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs. †Daily Value not established. |
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Other Ingredients: Malic Acid, Vegetable Capsule (plant cellulose and water), Rice Hulls (Oryza sativa), and Rice Flour (Oryza sativa). These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. |