I have no links to post right now because I couldn't really be that bothered to post any links so I'll just use my own common knowledge for now.
Like the title says "Onions are great antioxidents" and yes, they are indeed.
On Tuesday last week, I had a slight cough. On Monday morning-early afternoon, I still had this slight cough. In the evening I had a good soak in the bath with some Epsom salts. Afterwards my cough was a lot worse. The days after that my cough was bad and a cold eventually broke out. I was treating the cough/cold with herbal teas, ginger/mullein/echinacea, all great teas for cough/colds.
I did use onion as well. I had read once before that cutting the top and bottom of an onion and placing them on the bottom of your feet, using socks to hold them in place, did the trick. And what I read was not wrong either. A couple of years ago I had an upset stomach and I was lying down most of the day. I had onions put on my feet and half an hour later I was sitting upright and a few minutes after that I was eating.
I had a cough and fever last year and used onions again. The onion didn't have such a massive affect on my cough but it did on my fever.
This time around, the onions eased my cough, eased the cold or loosened it more and I had a little fever which the onion eased.
Now, I have read some things in the past that people used onions in the time of the Bubonic plague and also a few people, claiming to be doctors/"professionals", have denied the importance of onions and said they do not work when I can tell you now, they do.
I have said it before that we live in a heavily corrupt world and there is a lot of truthful information as well as a lot of false info out there, such as the doctors denying the truth :).
I shall also add menthol crystals. Basically they are crystalised peppermint essential oil, or something similar. One pack contains loads of different sized shards of crystals. I usually pop 1 or 2 shards in a cup and pour boiling water over and inhale away. Great for clearing the synuses. Careful with how much you use cos I put one big, fat shard in a cup, I covered myself with a towel/robe or domed myself and the fumes blew my head off :). My eyes were watering, my nose was running, I was having coughing fits but all that to me was a good thing, that is what you want to do when you've got a cold/cough. It's not a good idea to keep sniffing. You body is trying to get rid of mucus, that is why it runs. Blow it out into a tissue, keep blowing your nose. Get rid of all that gunk. Similar thing with the coughing.
Hope some of this info helped. I'm sure further links would provide much more help if I had added some :).
Take care everyone,