Posted in: Health

Marathoner Died After Using Supplement, Coroner Says Substance May Have Been Deadly

marathoner died after using supplement london

A marathoner who died after using a supplement has been autopsied, and a coroner indicates that the booster she consumed during the course of the London Marathon last spring may have contributed to her death.

The marathoner who died after using the supplement was Claire Squires, 30. Squires had been participating to raise money for suicide awareness, and, since her death, more than $1 million has been raised for the cause she supported.

The supplement the marathoner used is known as Jack3D, which contains a substance called DMAA, or dimethylamylamine. The supplement that may have contributed to Squires’ death has since been banned in Britain, but, at the time of her passing, DMAA was legally available for purchase in the country.

The marathoner’s grieving boyfriend Simon van Herrewege spoke about the supplement and her death, saying recently:

“She innocently took a supplement which at the time was entirely legal and widely available on the high street and somewhat worryingly apparently used by so many others… It is clear that there needs to be far better supervision of the so-called health foods and supplements industry so that no more tragedies like this happen again, causing other families to have to go through what we have been through this past year.”

Since the supplement became linked to the marathoner’s April death, a spokeswoman for the London Marathon reaffirmed its stance against use of such potentially dangerous substances.

london marathon

Nicola Okey said:

“The substance is on the (WADA) banned list, but the only athletes to be tested would be elite athletes. We just ask the rest of the runners to be medically fit. We don’t make any other inquiries about what substances they are taking… We will be amending our medical advice following the inquest’s verdict. We obviously give medical advice, but it hasn’t mentioned before the use of supplements.”

Of the marathoner’s use of the supplement and subsequent death, a coroner ruled that “on the balance of probabilities, in combination with extreme physical exertion, caused acute cardiac failure, which resulted in her death.”

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4 Responses to “Marathoner Died After Using Supplement, Coroner Says Substance May Have Been Deadly”

  1. Anonymous

    how ironic, she was raising money for suicide awareness and then died in the process.

  2. So Akhi

    I'm really sorry on her loss, although…

    It is really vital that you note that she already was diagnosed with an unnatural pulse, which was identified by her acupuncture doctor. She hid this through her friends and family.

    If she followed the label, which is plainly posted on websites like, she never should have used it in the first place.

    In fact, she should not have already been on ANY stimulants or supplements unless she had her physician's consent due to her medical problem.

    When the label demonstrably states for people like herself not to use it the supplement should never be blamed.

    Once again, I'm deeply sorry for her loss, however a complete business shouldn't ruined as a result of her improper use.

  3. Anonymous

    Only 30 – way too young. That's very sad. So was it a heart attack? Did anyone try CPR? Why do people take those supplements? Makes no sense. If you can't run without a drug then should a person be running in a marathon? DMAA is a stimulant. I could understand a person with chronic fatigue syndrome taking this just to function during the day but why take it when you are already stimulated and fit enough to be a runner?

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