Add lysine to your daily intake. Most colds are RNA-based viruses from what I've read and lysine helps lower the reproduction of RNA viruses. And saved a pet's life when the veterinarian put him on it. Covid is also RNA-based so I nagged friends to take it after the wicked virus got exported. No one who did has been infected with covid.

Lysine is just an amino acid so in many foods. I take more during cold season and, new normal, viral pandemics.

Enjoy at least planning your Ireland trip. You can find pen pal-matching agencies and might make friends there before you go :‐).