I hadn't heard that one, for sure.
My package (I've just been prescribed an initial course) states they're veggie, gluten-free and a hole lot of other stuff free.
My initial dose is 20,000 units, twice a week, for 10 weeks, that 10 microgrammes (400 units) daily thereafter. My GP likes to get the job done, I think.
She didn't prescribe me K2 to go alongside, but I've picked that up for myself. It's actually easier to by D3 +K2 combined, I found anyway, but that just might have been me.
Please don't think I'm trying to suggest your Doc has suggested anything wrong, or that I'm trying to persuade you to alter your doses. I'm just relaying personal experience of a recent personal experience.