Phosphates, specifically sodium phosphate might be one of the most promising ergogenic nutritional supplements based on peer-reviewed science. As with all studies more reseach is needed but the current research suggest a benefit. As mentioned by SoCalPete one of the side effects might be stomach cramps and or diarrhea. It might be best to test your tolerence before a hard workout rather than risk reactions during a race. Following is an abstract of one study done on endurance type athletes. There are several others with similar results. Note the dosage used. If I am not mistaken the Stim-O-Stam product suggests lower amounts. This could be the reason they failed to achieve a postive outcome in one clinical which used their product. Will it work for everyone? The verdict is still out but it might be worth a test.
Int J Sport Nutr. 1992 Mar;2(1):20-47. Related Articles, Links
Effects of phosphate loading on metabolic and myocardial responses to maximal and endurance exercise.
Kreider RB, Miller GW, Schenck D, Cortes CW, Miriel V, Somma CT, Rowland P, Turner C, Hill D.
Dept. of HPER, Old Dominion University, Norfolk, VA 23529-0196.
Six trained male cyclists and triathletes participated in a double blind study to determine the effects of phosphate loading on maximal and endurance exercise performance. Subjects ingested either 1 gm of tribasic sodium phosphate or a glucose placebo four times daily for 3 days prior to performing either an incremental maximal cycling test or a simulated 40-km time trial on a computerized race simulator. They continued the supplementation protocol for an additional day and then performed the remaining maximal or performance exercise test. Subjects observed a 17-day washout period between testing sessions and repeated the experiment with the alternate supplement regimen in identical fashion. Metabolic data were collected at 15-sec intervals while venous blood samples and 2D-echocardiographic data were collected during each stage of exercise during the maximal exercise test and at 8-km intervals during the 40-km time trial. Results indicate that phosphate loading attenuated anaerobic threshold, increased myocardial ejection fraction and fractional shortening, increased maximal oxidative capacity, and enhanced endurance performance in competitive cyclists and triathletes.