A controversial brand of testosterone cream claims to have boosted testosterone levels in men, but researchers have discovered a problem with its claims.
The brand of Bull Shark is made by The Wellness Company, which makes supplements for men including testosterone cream.
It claims to boost the body’s natural testosterone by adding a small amount of a compound called propylene glycol to its product, which is often referred to as bull shark testosterone.
It says it helps men maintain their testosterone levels and “increases testosterone production”.
But a review of 17 studies done in South Africa found propylene-glycol supplementation did not increase testosterone levels.
A study published in the American Journal of Clinical Nutrition found that in men who took the product, testosterone levels were not increased.
“We believe that this is a myth,” the company told the BBC.
“It is a product that is manufactured in China with ingredients sourced from the United States, but it is not a testosterone product.”
It’s unclear what effect propylene Glycol may have on testosterone levels, but the company did not deny it was present.
“The idea that you can use propylene as an ingredient in a testosterone supplement is not correct,” it said.
“This is a supplement that is produced by TheWellness Company and it is a testosterone booster.
We do not make testosterone supplements.”
The Wellness Co-op is the same company that sells products including bull shark, testosterone, and biofuel.
A spokesperson for the company said the products contained propylene and were not anabolic steroids.
“Propylene glycerin, a synthetic form of propylene, has been shown to reduce testosterone levels by reducing its conversion to testosterone ester,” the spokesperson said.
They said they believed that propylene had been used in the past to increase testosterone, which has been known to cause male infertility in animals.
The spokesperson said that the company had no knowledge of any other products containing propylene.
“No other products are sold in Australia that have been tested on animals, nor do we have any knowledge of anything else that is made with propylene.”
In a statement to ABC News, The Welliness Company said the product was produced by a small Australian company and that the brand did not make supplements.
“Bull Shark is the only product we use in Australia to contain propylene but our product is 100% pure and safe to use,” the statement read.
“At The Wellogy Company, we have been using bull shark for many years as an alternative to testosterone supplements and we have never heard of any adverse effects from using the product.”
As a result, we do not believe that any of our products contain propene glycol.
“The spokesperson did not explain why the company was taking such a stance on propylene in its products.
The Wellogy Co-Op is now in the process of selling its products in Australia.