Can you cite non-manufacturer studies that support this?
To the best of my knowledge, there is no organization that oversees nutritional suppliments quality or safety.
Studies on Ginseng for example have found that many of the over the counter packages contained minimal if any actual Ginseng.
Mens Fitness magazine also on recent looks at supliments had a few things to say:
Men's Fitness November, 1999
"While herbs are natural products, it's important to keep in mind that when stimulants such as ephedra (ma huang) are taken to enhance performance, they often function like drugs. "
Men's Fitness May, 1999
"Caffeine and ephedra
These two controversial stimulants are thermogenic on their own but have an even greater effect on fat loss when combined. They are added to several ready-made drinks or pills found in health-food stores, sometimes referred to by their respective herbal names, guarana and ma huang.
The problem, again, is side effects. Overuse of caffeine and ephedra has been associated with increased heart rate, insomnia, nervousness and even death. "Scientific studies have shown that [the combination] works, but I'm not crazy about the potential for side effects," Kalman says. If you're on antidepressant medication, ephedra is not an option. "
Men's Fitness February, 2000
"And if youÂ’re having any trouble sleeping, donÂ’t take fat-burning supplements that contain stimulating substances such as caffeine or ephedra. "
If it is safe, why has the NFL banned its use?
http://www.ephedrine-news.com/html/athletes.html
In May 2001, the NFL was the first professional sports league to ban the use of ephedra, allowing any player that fails a random testing for ephedra to be suspended for four games. The NFL's decision to ban ephedra followed reports from experts saying the supplement "can cause seizures, strokes, and even death." Prior to the NFL's decision, players had been endorsing ephedra-containing sports drinks. In August 2001, Rashidi Wheeler, a Northwestern University football player, brought national attention to the dangers of ephedra-containing products when he collapsed and died during a workout. Wheeler had drunk the ephedra-based sports mix Ultimate Punch and used Xenadrine with teammates prior to practice.
Why does the Military discourage its use, and have banned sales of ephedra based products on its bases? Certainly if any group out there needed a way to rapidly whip recruits into shape, and give their troops an edge in combat its the military.
"The military services have documented adverse effects due to ephedra-use. The Navy Surgeon General stated that "all three military services have documented medical cases where significant adverse events and deaths have occurred among active duty service members taking certain dietary supplements, specifically preparations containing ephedrine alkaloids." This has resulted in the Navy banning the sale of ephedra containing dietary supplements from Pearl Harbor stores and the Marine base at Kaneohe Bay. Due to the reports of soldier deaths due to ephedra products, such as Metabolife, the Moncrief Army Community Hospital issued a statement saying, "We recommend that you don't take ephedra at all. The bottom line: Ephedra is a very dangerous herb that can kill."
Additional information: The Honolulu Advertiser
http://the.honoluluadvertiser.com/article/2002/Sep/04/ln/ln01a.html
The Army and Air Force Exchange Service has banned the sale of popular ephedra-related dietary supplements in Hawai'i and elsewhere in the wake of reported adverse health reactions and the death of a Texas soldier.
From Honolulu Star-Bulletin
http://starbulletin.com/2001/02/09/news/story5.html
'All three military services have documented medical cases where significant adverse events and deaths have occurred among active duty service members taking certain dietary supplements, specifically preparations containing ephedrine alkaloids.'
Vice Adm. Richard Nelson
NAVY SURGEON GENERAL
The Military, the NFL and many other sports associations either ban it outright or discourage its use. California has recently passed laws concerning it and other states are expected to follow soon. Study after study not run by those who profit from it continue to find reason for concern.
Let us be frank here...the average person on the street does not have the discipline to watch their intake or count their calleries. They will simply pop the magic pills and wait to lose weight. They are not professional atheletes, they are not body builders. The average person on the mat doesn't eat 8 meals a day and wash it down with weight-gain 2000. This stuff is dangerous, and should not be readilly available for those who can not or will not use it safely (if that is possible) to obtain.