none. I put the dropper right under my tongue.

I used to chase it with a glass of water.

Challenge accepted!

I've been stuffy most mornings lately and have been taking it frequently

For cold/flu how big a dose?

I usually just fill it right beyond the tip otherwise I end up with an entire dropper in my mouth and have to spit it out in the sink and the bathroom smells like oregano all day

Oh shit I think I overdosed.

Are there side effects?

I've done higher when I'm sick. Like where that cord crosses over the glass.

Not that I know of.

K well so far so good.