A 10-year-old boy has 20 complex allergies, including seafood, coconuts and cats, and has to visit the US regularly for life-changing treatment.
After travelling 5,000 miles (8,046 km) every 12 weeks for the past 18 months, Yann Jennings has gone from not being able to have nuts in the house to eating some types daily.
Mum Katie Hutt, 46, is hoping Yann will be in remission by the time he is in secondary school after enrolling on an allergy elimination programme in California, which costs them £30,000 a year.
She said the NHS in the UK could not help her son’s “complex” allergies, while the Welsh government said all people “deserve timely access to the services and support they need”.
Katie said Yann will miss 18 months of school in total while completing his four-year treatment plan in the US.
The family stay there for around a week at a time every three months, with the family teaching Yann and sister Mai, eight, themselves when they miss school.
Some experts believe similar help is available in the UK via the private sector, but agree provision needs to be improved on the NHS.
“I learned from joining allergy groups on Facebook and learning from other parents whose kids already had anaphylaxis [allergic reactions], what it could potentially look like,” Katie said.
As a baby, Yann had severe eczema and at six months, blood tests showed he was allergic to milk, peanuts and eggs.
But “some trial and error experiences” allowed the family to find many more allergies.
These included dairy, wheat, tree nuts, coconut, seafood, red fish, pulses and beans, kiwi, sesame, dogs, cats, horse, pollen, flaxseed, chia, poppy seed, buckwheat, millet, peas, chestnut, quinoa, rye, oats and pumpkin.
Katie described how Yann would “flare up” if he was in a room with any of his allergens.
He also felt safer being outdoors or with the windows open all the time.
But in terms of treatment, Katie said: “By the time he was three, we’d exhausted all options in Wales.
“We were told he’s too complex, he’s too high risk.”