Hi, I'm 23 with CF. I started taking garlic capsules alot of years ago, and after a few bottles, did not notice any significant effect. Then I read an article about the 'active' compound in garlic, and that it is lost during processing in many over the counter garlic supplements. So I tried eating garlic cloves raw. I know, I know, how gross is that!? And it is extremely gross. It burns your mouth and brings tears to your eyes. HOWEVER after eating a clove or two, I could really feel the difference. Congestion cleared within a few minutes. It seemed like my mucous would just liquify immediately and I could cough easily. I eat raw garlic about 3-4 times a week. But whenever I feel a cold coming on, I increase my intake to 2 cloves a day. It's absolutely amazing! I haven't been on antibiotics in 6 years. I have on average 1 cold per year (last year it was zero!). The one MAJOR downside to eating raw garlic is obviously the aftertaste which seems to last for hours and more obviously the wonderful breath you have afterwards. I'm married, so obviously I didn't want to smell like I was warding off vampires around my husband, but he is extremely understanding. And I always arrange to eat it just before I go to bed so I'm not breathing stink breath on everyone all day.
Anyways, that's my experience with garlic. If you decide to try it, I hope it works as well for you as it has for me.
Oh ya, one important tip - raw garlic must be CHEWED. Why? Because the active healing compound in garlic is only formed AFTER it is chewed or crushed. Why? Because allicin (active component) is not present in fresh garlic. It is formed after alliin (substrate) comes into contact with alliinase (enzyme) which is done by chewing or crushing. The enzyme acts on the substrate to form allicin which is the compound you need. Now I know most of the garlic supplements state each capsule contains a certain amount of allicin, and on-and-off I buy a different brand to try it out. NEVER has a supplement come close the effects of eating it raw. It's a major piss-off, but I guess you can't always get what you want.