@rjd Just to update, I decided to continue taking it. My conclusion was that the heavy metal content was low enough to not be a concern. Sometimes I mix it into a smoothie, but my go-to drink is fat-free milk + 1 tbsp collagen + 1 tbsp Ovaltine. It's a calcium / collagen / vitamin drink all in one.

My wife does take collagen, and she has mentioned something about skin and nails, so I guess it is helping her.