The theory goes that the high concentration of Vitamin B1 (thiamine) in Marmite alters your body odour, making you less appealing to biting insects. It's a lovely idea, and one that has been passed down through generations of travellers.

Unfortunately, scientific research has consistently failed to back up this claim. Studies, including those from the London School of Hygiene & Tropical Medicine, have found no evidence that consuming Vitamin B or Marmite has any effect on mosquito attraction. Experts recommend sticking to proven repellents containing DEET or lemon eucalyptus oil.

So, while it won't help with the bugs, you can still enjoy your Marmite on toast for its delicious, savoury taste.

Source: https://uk.yahoo.com/news/marmite-mosquito-repellent-myth-busted-100000000.html, https://www.cosmopolitan.com/uk/body/health/a30000/does-marmite-repel-mosquitoes/