You need to grow up. You have posted no references and you don't even understand what PubMed is.
You say something is dangerous, explain it and post some references.
Here are even more references supporting BCAAs use and their effectiveness.
Branched-Chain Amino Acids
Blomstrand E, Celsing F, Newshome EA (1988) Changes in plasma concentrations of aromatic and branch-chain amino acids during sustained exercise in man and their possible role in fatigue. Acta Physiologica Scandinavica 133, 115-21
Bloomstrand E, Hassmen P, Ekblom B et al (1991 ) Administration of branch-chain amino acids during sustained exercise - effects on performance and on plasma concentration of some amino acids. European Journal of Applied Physiology 63, 83-8
Bloomstrand E, Hassmen P, Newsholme E (1991 ) Effect of branch-chain amino acid supplementation on mental performance. Acta Physiologica Scandinavica 143, 225-6
Carli G, Bonifazi M, Lodi L et al (1992 ) Changes in exercise-induced hormone response to branched chain amino acid administration. European Journal of Applied Physiology 64, 272-7
Coombes J, McNaughton L (1995) The effects of branched chain amino acid supplementation on indicators of muscle damage after prolonged strenuous exercise. Medicine and Science in Sports and Exercise 27, S149 (abstract )
Davis JM (1995) Carbohydrates, branched-chain amino acids, and endurance, The central fatigue hypothesis. International Journal of Sport Nutrition 5, S29-38.
Davis JM, Baily SP, Woods JA et al (1992). Effects of carbohydrate feedings on plasma free tryptophan and branched-chain amino acids during prolonged cycling European Journal of Applied Physiology 65, 513-19
Gastmann UA, Lehmann MJ (1998). Overtraining and the BCAA hypothesis. Medicine and Science in Sports and Exercise 30, 1173-8
Hefler SK, Wildman L, Gaesser GA et al (1993). Branched-chain amino acid (BCAA) supplementation improves endurance performance in competitive cyclists. Medicine and Science in Sports and Exercise 25, S24 (abstract)
Kreider RB (1998). Central fatigue hypothesis and overtraining. In Kreider RB, Fry AC, O’Toole M (editors), Overtraining in Sport (pages 309-31). Champaign, Illinois: Human Kinetics
Kreider RB, Jackson CW (1994). Effects of amino acid supplementation on psychological status during and intercollegiate swim season. Medicine and Science in Sports and Exercise 26, S115 (abstract)
Kreider RB, Miller GW, Mitchell M et al (1992). Effects of amino acid supplementation on ultraendurance triathlon performance. In Proceedings of the I World Congress on Sport Nutrition (pages 488-536). Barcelona, Spain
Enero
Newsholme EA, Parry-Billings M, McAndrew M et al (1991). Biochemical mechanism to explain some characteristics of overtraining. In Brouns F (editor) Medical Sports Science, Vol. 32, Advances in Nutrition and Top Sport (pages 79-93). Basel, Germany Karger
Wagenmakers AJ (1998. Muscle amino acid metabolism at rest and during exercise: role in human physiology and metabolism. In Holloszy JO (editor) Exercise and Sport Sciences Reviews (pages 287-314). Baltimore, Maryland Williams & Wilkins
Enjoy PoorServe you have been smoked!
You can buy BCAAs here for $10.00 for 200grams (cheap and more safe than drinking your local tap water)
http://www.easycart.net/BeyondACenturyInc./Amino_Acids_Arginine_Formulas_etc.html