Place smashed garlic cloves (leaving the skin on is fine) and alcohol into a glass jar.
Leave in the fridge for 7-10 days, then strain garlic through a muslin cloth. Place the remaining liquid back into jar and place in fridge for 2 days.
Take garlic infusion, in drop form, for twelve days, morning, midday and evening, when you feel a flu approaching or want to boost immunity. Every time increasing your dose with an extra three drops, until you are taking up to 25 drops.