A popular sports supplement has been banned from use in the UK after it was found to contain a toxic substance that can have lethal side effects.
Fitness fanatics should no longer use Jack3D because it contains the chemical DMAA which has been linked to the death of at least one man, the Medicines and Healthcare products Regulatory Agency (MHRA) said.
The MHRA has ruled that Jack3D is an unlicensed medicinal product and that all other products containing DMAA need to be removed from the market to protect public safety.
DMAA, which is used as a workout aid or weight-loss supplement, has been linked to psychiatric disorders, heart attacks, strokes and even a death.
It has been linked to suspected adverse drug reactions across the world. A male mine worker died in Australia after taking DMAA which he purchased over the internet, an Australian coroner found.
MHRA's medicines borderline section manager David Carter said: "People need to be aware when choosing their sports supplements. These products may claim to increase performance but contain powerful ingredients which can have serious side effects.
"We recommend that people only use approved products and speak to a qualified medical practitioner if they have any concerns about any supplements they may be taking."
DMAA is also on the list of substances banned by the World Anti-Doping Agency.
Graham Arthur, legal director at UK anti-doping, added: "This is a significant step forward for all competitive athletes as methylhexaneamine (DMAA) is a banned substance 'in-competition' that frequently appears in over the counter and internet bought products but not clearly on the label.
"Athletes who use sports supplements need to choose reputable manufacturers who can justify their claims with scientific evidence, and have their products screened to minimise the risk of testing positive for a substance on the World Anti-Doping Agency's prohibited list."