Worth a read..
If you have access to academic journals.. this clears up some of the "broscience" on here about E
Effects of Ephedra on autonomic nervous modulations:
Chen WL, Tsai TH, Yang CC, Kuo TB, Clinical Pharmacology And Therapeutics [Clin Pharmacol Ther], ISSN: 1532-6535, 2010 Jul; Vol. 88 (1), pp. 39-44; PMID: 20520603
This discusses clinical reaction and toxicity of E
Woolf, Alan D.; Watson, William A.; Smolinske, Susan; Litovitz, Toby. Clinical Toxicology (15563650), Aug2005, Vol. 43 Issue 5, p347-355, 9p, 3 Charts, 1 Graph; DOI: 10.1081/CLT-200066075
Chen, Wei-Lung; Tsai, Tung-Hu; Yang, Cheryl C.H.; Kuo, Terry B.J.. Journal of Ethnopharmacology, Aug2010, Vol. 130 Issue 3, p563-568, 6p; DOI: 10.1016/j.jep.2010.05.056
And this one..
Mehendale, Sangeeta R.; Bauer, Brent A.; Chun-Su Yuan. American Journal of Chinese Medicine, 2004, Vol. 32 Issue 1, p1-10, 10
Anyone who thinks they feel a difference between HCL and Sulfate should be interested. These studies both link to a group of case studies where scientists essentially determined the difference in ephedrine HCL and Sulfate absorption/reaction in the body was .0002% after a four week run. Thats as numerically close to "zero difference" as it gets.