As trisha wrote you need to use a fresh onion every night that you need to do this.
Onion in room overnight.
There is no scientific evidence to prove it.
I have always simply put the onion in a plate on the night stand besides the person s head while they are sleeping.
Washing your hands regularly avoiding crowds during flu season and taking care of your health by eating well exercising and getting ample sleep can help you stay healthy.
Take half of a cut onion and put it in a bowl.
Onion is an ingredient which when cut into small pieces and placed in close proximity to you can help to keep the air humid acting as an expectorant and helping to relieve symptoms.
Placing a raw cut onion in contact with your foot overnight purifies your blood removes toxins and heals your body.
However white onions are encouraged for use.
Placing an onion in the room will not treat or prevent you from getting a cold.
It s a fact onions were used in folk medicine long before 1919 but it s just a false belief.
There have been many other versions of this story claiming that leaving onions around a room will absorb the flu virus along with bacteria causing other illnesses and will prevent people from becoming sick.
Please remember it is dangerous to cut an onion and try to cook it the next day it becomes highly poisonous for even a single night and creates toxic bacteria which may cause adverse stomach infections because of excess bile secretions and even food poisoning.
So as long as you can stand the smell you could try placing a plate of chopped onion in your bedroom.
There are a variety of onions that work well to increase your health.
Simple tips to prevent catching the cold or flu was this page helpful.
The warnings were aplenty and alarmist.
Place the bowl in your room to remain there overnight to absorb the harmful toxins in your environment.