Former SAS: Who Dares Wins star Jason Fox has spoken publicly about his experience with low testosterone.
The ex-special forces operator, now a brand advocate for men’s health Voy, said his diagnosis helped explain months of unexplained low mood.
Mr Fox said: "Finding out I had low testosterone explained an awful lot.
"It made things a bit clearer.
"It gave me clarity and understanding – and then to know that you can actually do something about it."
Despite maintaining a healthy lifestyle, he said he had felt persistently low and initially attributed the symptoms to age and fatherhood.
He said: "I thought I was just getting older, which is obviously true.
"Then I thought having had a baby at an older age had impacted my mood.
"That's probably true as well, but I didn't realise it was linked to my hormones."
Before starting testosterone replacement therapy (TRT), Mr Fox said he tried to improve his hormone levels through lifestyle adjustments.
He said: "We went through the beginning part of the journey by bloods and an adjustment of life – not that there needed to be too much of an adjustment, but it was more about refining what I was already doing."
Although those changes brought some improvement, his testosterone remained low.
He began TRT around nine months ago and said the impact has been life-changing.
He said: "I am probably, as far as people that live with me are concerned, a better person to be around.
"Everything is better now.
"The mood's better, I'm feeling great, my wife's happy, I'm training, training hard – I'm loving life."
Regular blood tests have shown his testosterone levels have risen from 11 to around 30, with other health markers also improving.
He said physical symptoms have eased as well.
He said: "I ache less – I ache a lot less.
"Today I went and did a plyometric session, and that would have, last year, filled me with dread.
"Now I'm doing it, and it's fine.
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"It's been a game changer."
Mr Fox said he wants to reduce the stigma around men’s hormone health and encourage others to get tested.
Dr Jeff Foster, Medical Director for Men’s Health & TRT Specialist at Voy, said: "Everyone thinks that testosterone is just for bigger muscles and better sex.
"But this is a massive misconception.
"We know that testosterone is an incredibly potent metabolic drug that you need through your entire life to keep your heart, brain, and your entire body healthy."
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