Helping Toddlers immune system

Hi, I'm just wondering if anyone can offer advice on any good natural products that might help me build my toddlers immune system.

She started daycare last year and even now 12 months in she still seems to pick up every bug under the sun. She's had tonsillitis 3 times in the last 3 months and now today she's come home with a runny nose. I've also been the sickest Ive ever been in the last 12 months because she's passing it all on. I give her the childrens inner health powder fairly often and she also has a cup of the toddler gold formula each day.
I've got a feeling someone told me once olive leaf extract was good for helping the immune system? Can anyone vouch for this? And how do you get your toddler to take it? (mine won't take medicines or anything out of a dropper)

TIA :)

I haven't tried this yet but a lady I know at the chemist was telling me about it the other day cos I was chatting to her about how we've been nothing but sick here for ages too! She told me about Colloidal Silver. I am looking into it at this stage, but apparently it works and has many different uses.

Thanks for your reply Ozziehoffy, sorry for my late response.
I'll def. keep coloidal silver in mind. i ended up buying some olive leaf extract. It's berry flavour and I've been putting it in her joice, I'll see how that goes :)