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A young woman died after swallowing a toxic amount of caffeine tablets – the equivalent of 100 cups of espresso coffee.

An inquest at Llangefni today heard that Gemma Ann Jones, 26, was found dead lying on her bed by a friend who had to break down her locked bedroom door.

Gemma’s friend, witness Martin Lloyd, of Y Glyn, Caernarfon , said: “She used to text me every night saying she felt ‘crap’.

He remembered one message saying: ‘I can’t keep going on like this’. Mr Lloyd said: “We used to talk about it and sort it out.”

The North Wales Daily Post reported that on the morning of November 18 last year, Mr Lloyd said he had “a gut feeling something was wrong. I just knew in my stomach that something wasn’t right.”

He tried calling Gemma, an office worker, 20 times and left messages for her.

When he got to her home in Llanfaelog, Anglesey , he found her car outside, the blinds down and her front door locked. He said: “Me and Gemma were supposed to go out for the day.

He got a front door key from a neighbour he knew. When he got to her bedroom, Mr Lloyd said: “She was just lying on her left side; her face down on the pillow. I just saw a brown residue by her mouth.”

Mr Lloyd phoned 999 at 10.45am and was told to do CPR but she had already died.

He said: “I was devastated. We had plans coming up.”

North West Wales coroner Dewi Pritchard Jones said police examined Gemma’s mobile phone. One message said: “So how long will it take to shut down the body? It can’t be long because I am already tired.”

Mr Jones explained that the substance was a compound used by athletes and keep-fit enthusiasts containing mainly caffeine .

Ysbyty Gwynedd pathologist Dr Mark Lord said post-mortem toxicology tests showed she had swallowed a high number of tablets of the tablets.

He said: “It was clearly a high level. The toxic effects of caffeine would have affected the heart. It was death due to caffeine .”

Mr Jones said: “This is an unusual case. She has taken a very high level of caffeine that led to her major organs not functioning. She died of caffeine toxicity.”

He said: “Was there a proper intention to kill herself or was she going through a depressive episode? The answer is I don’t know.”

Recording a narrative conclusion, Mr Jones said: “Gemma Ann Jones did kill herself” – without making any other findings at all.