There is some debate about the science behind this particular holiday health hack.
But the fact remains: many people say that it works.
They say that, when they take Vitamin B1 supplement on holiday, they find they DON’T get bitten by mosquitoes.
Vitamin B1 – also known as ‘Thiamine’ – is available in shops like Holland & Barrett for around £3.50 for 100 tablets.
Other repellents that holidaymakers swear by include garlic, patchouli oil and zinc.
Have you discovered any secrets to keeping the mozzies away?