I'm chiming in very late here, but we're avid oregano oil users here. As well as some other good stuff - but OO is our go to "medicine" of choice.
With seven kiddos we have increased odds of illnesses in our family - I have a few who have to touch everything and insist on putting their fingers in their mouths or up their noses regulalry. We take Vit D at 35iu per pound for everyone in the family. Lots of Vitamin C if there is a bug or we've been exposed to anything. We'll use herbal teas to help strengthen the immune system - but again, only if there has been exposure (usually echinaccea and/or elderberry). I used to make some herbal tinctures however, since using oregano oil I truely haven't needed them. I also like to use garlic and occasionally we'll use silver as well.
My kiddos tend to get a cold or two a year - not bad for a family of our size. I think my hubby has had a few mild illnesses in the past 3 years and I haven't been sick at all in that time - I've felt it coming on, but I've been able to nip it in the bud before it settles. Finding oregano oil has been a HUGE blessing for us!
We're pretty liberal with the oil - we use the brand Oregoil (Azure Standard carries it, not sure where else it can be found). It's in an olive oil base. It is far less expensive than the North American Herb and Spice brand and it's been extremely effective for us. Here's how we usually dose it:
Given under the tongue, with a glass of water at the ready to wash it down. If it's used as a preventative due to exposure it's generally just 1x daily, if kids are actually sick we use it 2x a day.
3yo gets 1 drop
5yo gets 2 drops
6 yo gets 2-3 drops
9 yo gets 3 drops
11 and 13 yo get 4 drops each
16 yo takes up to 8 drops
Dh takes anywhere from 6-10
I take 8-12
Prior to about 2.5 yo, I rubbed a drop or two onto each foot at nap time and bed time. With congestion I've rubbed a drop or two onto the chest as well.
More info than you wanted, I'm sure but just thought I'd let you know what has been successful for us with a house load of kids over the past few years.
HTH,
Debbi