<<Disclaimer: Verify this information before applying it to your situation.>>
The daily kind contains lactose. It is a lactose base.
I don't know about the once a week kind. Best to
check on the ingredients.
If you are lactose intolerant, please keep this in mind.
Didronel or Etidronate has no lactose, but I haven't checked
on the GF status yet. It doesn't work quite as well.
Vicki