Chromium picolinate

Polynomstapler

New member
Hallo meine Lieben ;)

Hat jemand (Skyguide? ;)) Studien zur Wirksamkeit von Chromium bezüglich Fettabbau/Muskelaufbau?

Gruss,
D.
 
Chrom ist aktiver Bestandteil des Glucose Tolerance Faktors (GTF). GTF verstärkt die Insulinwirkung und ist für dessen Funktion notwendig.
Mir ist eine Interventionsstudie an Fußballern bekannt, die während eines mehrwöchigen Krafttrainings 200µg Chrom (als Picolinat) als Supplement erhielten. Dies zeigte keinen Effekt auf Körperzusammensetzung und Muskelkraft gegenüber einer Kontrollgruppe.

Eine Studie an weiblichen Studenten unter Krafttraining zeigte allerdings eine Zunahme des Körpergewichts gegenüber der Kontrollgruppe.

Bei beiden Studien wird jedoch nichts über die Chromzufuhr durch die Nahrung gesagt, die effektive Gesamtzufuhr bleibt somit im Dunkeln.


Falls ich die Studien wiederfinde, gibt´s auch einen Verweis darauf.;)


jeckyll
 
Vielen Dank, habe eben extrem Unterschiedliches gehört.

Egal, ich nehms gerade. Notfalls isses ein teures Placebo. Wobei ich letzens von einer Studie gehört habe, die besagt, Cr P. sei cancerogen. Hat mich schon beunruhigt..

Gruss,
D.
 
Ne Aussage der FTC:

COMPANIES ADVERTISING POPULAR DIETARY
SUPPLEMENT CHROMIUM PICOLINATE CAN'T SUBSTANTIATE
WEIGHT LOSS AND HEALTH BENEFIT CLAIMS, SAYS FTC

The Federal Trade Commission today announced settlements with three California companies charged with making unsupported claims about weight loss and health benefits for chromium picolinate, one of the hottest dietary supplements on the market. The FTC said that these claims must be backed with solid scientific evidence, but these were not.

Some have called chromium picolinate the "medical miracle of the 1990s." At issue are claims that most American diets lack adequate chromium and risk potentially serious health problems, and claims that chromium picolinate supplements burn fat, cause weight loss, increase muscle mass, reduce serum cholesterol, regulate blood sugar levels, and treat or prevent diabetes. Chromium is a trace mineral that appears to play a role in insulin function. Chromium picolinate has found its way into many products, including chewing gum; total retail sales for chromium-based supplements are estimated to be $100 million a year.

"Consumers have a right to expect that claims that products will speed weight loss and improve health are based on solid scientific evidence, not preliminary or inconsistent findings," said Jodie Bernstein, director of the FTC's Bureau of Consumer Protection.

Today's cases are against:

Nutrition 21, the sole supplier of chromium picolinate in the U.S., Selene Systems, Inc., a general partner of Nutrition 21, and Herbert H. Boynton. The San Diego-based company holds the exclusive U.S. license on the patent rights to chromium picolinate, and sells it to the public through distributors;
Victoria Bie, doing business as Body Gold, a La Jolla-based company that sold its dietary supplements directly to the public through ads in national magazines. The main ingredients of the products -- sold under the names Chromium Picolinate, 24K with Chromium Picolinate, Super Fat Burner Formula, L-Carnitine, Daily Energy Formula, and Citrigold -- are chromium picolinate, L-carnitine, and/or (-)hydroxycitric acid (HCA); and
Universal Merchants, Inc., a Los Angeles-based company and Steven Oscherowitz, its president. The company advertises and distributes its chromium picolinate chewing gum products -- Chromatrim and Chromatrim 100 -- through an infomercial starring Susan Ruttan, an actress who appeared in the long-running series, L.A. Law, and in print ads in national magazines.
Today's complaints cite various advertising statements and testimonials from consumers claiming weight loss and health benefits that allegedly can be achieved by using chromium picolinate. According to the complaints, the companies failed to provide adequate substantiation for their claims that the supplement would, among other things, cause significant and long-term weight loss; improve body composition by reducing body fat and building muscle; increase metabolic rate; control appetite; reduce serum cholesterol; regulate blood sugar levels; increase energy and/or stamina; and treat and prevent diabetes.

The FTC also maintains that:

the companies failed to substantiate their claim that 90 percent of American adults do not consume enough chromium in their diets to support normal insulin function and therefore are at risk for obesity, heart disease and diabetes;
the companies falsely claimed that chromium picolinate's benefits are proven by scientific studies; and
some of the companies made unsubstantiated claims that the testimonials used in their ads reflect the typical experiences of consumers who use chromium picolinate products.
According to the FTC's Bernstein, Americans spend about $33 billion a year on weight loss products, programs and services. "There's only one way people can tell the sizzle from the substance when it comes to these kinds of claims," she said. "Subject them to a healthy dose of skepticism." Over the years, the FTC has brought more than 140 cases against companies making deceptive weight loss and health benefits claims.

Under the proposed consent agreements to settle these allegations, announced today for public comment, the respondents would be prohibited from making any of the challenged claims for chromium picolinate in the future, unless they have competent and reliable scientific evidence to support them. The settlements also would require them to have competent and reliable scientific evidence to support any representation they make about the benefits, performance, efficacy, or safety of any food, dietary supplement, or drug they advertise or sell.

The settlements would further prohibit the respondents from misrepresenting the results of any test, study, or research. Respondents Bie and Universal Merchants would be prohibited from representing that any testimonial or endorsement is the typical or ordinary experience of users of the advertised products, unless the claim is substantiated or the respondents disclose the generally expected results clearly and prominently.

In addition, the settlement with Nutrition 21 would require the company to send its customers (who resell chromium picolinate to the public) a notice of the Commission's allegations and a request to stop using sales materials making the challenged claims. This notice must be sent to anyone with whom Nutrition 21 has done business since 1993 and everyone with whom they do business for the next three years.

Finally, the settlements include various reporting requirements to help the FTC monitor the respondents' compliance with their provisions.

The Commission votes to accept the three consent agreements for public comment were 5-0.

A summary describing the consent agreements will be appear in the Federal Register shortly and will be subject to public comment for 60 days, after which the Commission will decide whether to make them final. Comments should be addressed to the FTC, Office of the Secretary, 6th Street and Pennsylvania Avenue, N.W., Washington, D.C. 20580
 
und noch was:

There had been scientific references that suggested that supplementing with Chromium Picolinate would enhance insulin utilization. That has not proven consistently true in current research.

Chromium can be measured in hair and blood. But laboratory methods to determine chromium levels are lacking. This is why a chromium requirement has not been determined. There is no Recommended Dietary Allowances (RDA) for Chromium. Toxicity of chromium is low according to the National Academy of Sciences. However since people have started to supplement with chromium picolinate, there have been several cases of toxicity which resulted in chronic renal failure and accumulation of chromium in tissues. Persons with behavior disorders are warned to avoid chromium supplements.
 
und weiter....

Dietary supplement may be cancer risk
By LORI VALIGRA

WASHINGTON, March 23 (UPI) - A popular dietary supplement claimed to reduce body fat and build muscle also may cause genetic mutations and cancer. Chemists at the University of Alabama said they showed the supplement, chromium picolinate, causes DNA to break, and that in turn can cause mutations of genes and cancer. The researchers presented their findings today at the American Chemical Society in Anaheim, Calif.

Other researchers challenge their conclusions. A lead scientist at the United States Department of Agriculture, who has been conducting tests on chromium picolinate, said the compound's benefits far outweigh any possible problems. But the Alabama researchers, who conducted their studies in rodents, said their work backs earlier studies at Dartmouth College that chromium picolinate can get into cells in a lab dish and damage DNA. And their study for the first time explains how chromium picolinate causes the amage, they said. "We've shown this compound can affect DNA, and things that affect DNA are not good for your health," said Stephen Woski, a chemist and assistant professor at the University of Alabama who did the research with colleague John Vincent. "The kinds of damage it does in the past have been related to cancers."

Chromium picolinate, a chromium compound, comes in the form of tablets, as an ingredient in sports drinks and in certain gum. Supplement suppliers claim the compound reduces body fat and builds muscle. There also are claims that it reduces the risk of cardiovascular disease and the symptoms of diabetes. Chromium picolinate is the most popular dietary supplement in the United States, with sales of more than $150 million annually, according to the U.S. Department of Agriculture (USDA). The main supplier of the compound, Nutrition 21 of San Diego, Calif., claims it is distributed into about 97 percent of all retail drug stores, health food stores and mass market outlets nationwide.

The health claims for chromium stem from its role as an essential nutrient for humans to metabolize carbohydrates and fats. The chemists at Alabama said they believe it does this by making the receptor for insulin work better in cells. But the role of chromium still is not well understood, they said. Chromium is needed only in small amounts. However, the USDA said more than 90 percent of American diets contain less than the minimum recommended daily allowance of chromium, and sources of chromium in the diet are poorly absorbed by the body. The body needs small amounts of chromium, only about 50 micrograms a day. Chromium picolinate is a compound that improves the body's absorption rate of chromium. The Alabama researchers said it seems to be quite stable, and it could be a big concern if it gets into cells intact and interacts with vitamin C or certain other biochemicals and oxygen, a deadly combination that can break DNA.

Because a lot still is unknown about what happens in animals and humans when chromium picolinate is consumed, a lot of controversy remains about the possible benefits and risks of taking chromium. Dr. Walter Mertz, a retired USDA scientist who discovered chromium's role as an essential mineral to the body, said chromium is needed in tiny amounts per day for proper action of the hormone insulin. He said that under certain conditions, chromium compounds might cause chromosome damage. And, many people may not need to take chromium supplements. However, Richard Anderson, a lead scientist at the USDA who has been conducting tests on chromium picolinate, said the compound's benefits far outweigh any possible problems. He argued that the Alabama researchers tested chromium picolinate in a very sensitive system in rodents with no protective mechanisms, and similar results have not been seen in the human body.

"We have found there are definite positive affects for glucose intolerance (and diabetes) that outweigh any potential problems," Anderson said. "Chromium is one of the safest nutrients you can take." Woski and Vincent admit more research needs to be done to understand how chromium picolinate affects people and animals. But they caution consumers about taking chromium picolinate supplements. "I would definitely be concerned about taking this nutritional supplement based on what we've found," Vincent said. He said more research needs to be done on the cancer and mutations the compound might cause and to develop other absorbable sources of chromium that will not cause the damage. In the meantime, wary consumers might try eating a more well-balanced diet. And that might not be too much of a sacrifice. "The best foods for chromium are lobster and beer," said Woski. Add to that whole grain cereals, meats and cheese.
 
Several months ago, many news reports alarmed the public by carrying the headline “Chromium picolinate causes cancer!” The headline was based on a presentation to the American Chemical Society by John B. Vincent, Ph.D., titled “The nutritional supplement chromium(III) tris(picolinate) cleaves DNA1.” We reviewed the article after publication. This was a test-tube study done on DNA, one of the components of a cell. The results are accurately reported: after exposure to chromium picolinate in the presence of vitamin C, the DNA began to unravel. But associating DNA damage in a test tube to cancer in a human being is just speculation by the researchers.



We then searched MEDLINE for chromium picolinate and mutagenesis in cellular DNA. Several articles show that there is an increase in oxidative stress in cells maintained in test tubes. However, in a study done on entire cells (not just cell components), while oxidative stress occurred, there was no damage to the cells themselves2. We also found a study that demonstrated that picolinic compounds can kill leukemia cells while not harming normal human cells3. It would be just as speculative and irresponsible if we were to say that picolinic compounds, like chromium picolinate, cured leukemia. All we know for sure is that there is still much research to be done.



So, what are we to think regarding the potential for chromium picolinate to cause DNA damage in the body? The human body is a wonderful and complex series of systems, all working together to keep us alive and healthy. When we remove cells from the body, we eliminate the body’s ability to respond positively to any challenge placed on those cells. In other words, the cell must depend on itself, and only itself, without the benefit of the blood supply, the immune system, the endocrine system, and all of the other wonderful systems that keep us operating optimally. Many substances can cause oxidative stress to cells in test tubes; it just doesn’t always seem to carry over to the whole body. What happens in a test tube may—or may not—mean anything in the body.



At BLI, we always examine an issue in total. The decision to supplement or not is always up to you as the consumer. However, there is no reason to avoid dietary supplements that contain chromium picolinate based on the research to date. In fact, in the amounts that are reasonable, 100-400 mcg per day, scientific data indicate there are health benefits of chromium supplementation for normalization of glucose metabolism. With the alarming increase in diabetes the last few years, that’s an important benefit.



References:

1. Speetjens JK, Collins RA, Vincent JB, Woski SA. The nutritional supplement chromium(III) tris(picolinate) cleaves DNA. Chem Res Toxicol. 1999 Jun;12(6):483-7.

2. Taguchi H. Vitamins and apoptosis--induction of apoptosis in human cancer cells by nicotinic acid-related compounds. Nippon Rinsho 1999 Oct;57(10):2319-24.

3. Bagchi D, Bagchi M, Balmoori J, Ye X, Stohs SJ. Comparative induction of oxidative stress in cultured J774A.1 macrophage cells by chromium picolinate and chromium nicotinate. Res Commun Mol Pathol Pharmacol 1997 Sep;97(3):335-46.
 
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