A new group of dietary supplements that are touted to help with arthritis and neurological conditions has a controversial history.
In recent years, Neuraganic supplements have been marketed by a number of medical and pharmaceutical companies.
They include an arthritis-fighting supplement and an anti-depressant.
But the companies behind the supplements say the products are harmless, and have no known connection to serious health problems.
The group of products, called Neurogenic, is owned by Dr. Daniel P. Creswell, who is also a member of the board of directors of Neurogenic.
The group has received tens of millions of dollars in government grants to study the products.
The company says the products work to relieve pain and stiffness in arthritis.
Neurogenic has not made a statement about its scientific validity.
Neurogenics chief executive John M. Cappelli said the group was seeking to prove that the products could work.
He said Neurogenic had found a solution to an illness that was caused by the same protein that causes Parkinson’s disease.
He added that neurogenic products work with an enzyme that can be used to reduce inflammation in the body.
Creswell has been in the spotlight because of a study he conducted in his lab that showed the proteins in Neuragics are active against nerve damage.
The study was published in The Journal of Neuroscience last year, but the company says it has since stopped publication.
Crispin R. Lipscomb, a professor of biochemistry at the University of Colorado, Boulder, says the results don’t support the idea that the proteins found in Neugenics cause the disease.
“I don’t think the study is convincing in that regard,” he said.
In the study, researchers found that when the protein in NeiGens was injected into the bloodstream, the body’s immune system could detect it and shut down the enzyme.
But there is some controversy over the study.
Linscher said the results were in line with a study that looked at a drug called riluzole, which is used to treat epilepsy and Alzheimer’s disease, and found the drugs also helped relieve pain.
Linscher also said the company was trying to get a better understanding of the protein’s action, but he said he could not tell if the results support the claims.
Lipscomb also questioned whether the product could be effective in people with arthritis, especially people who are prone to it.
“There’s no evidence that the protein that’s being injected into our bodies does anything to help those people who suffer from arthritis,” he told ABC News.
Lipson says it is important to note that the drugs that were injected into mice did not cause a rise in inflammation.
“It’s really not clear to me that that would be beneficial,” he added.
“It’s also unclear to me whether this could be a real benefit in people who have arthritis.”
Follow David Sallust on Twitter at @david_sallust.