LoginCalcium carbonate and thiamin Search for: Dog Food Advisor › Forums › Dog Food Ingredients › Calcium carbonate and thiamin Viewing 1 post (of 1 total) Author Posts April 25, 2018 at 3:28 pm #113974 Report Abuse Ellies ParentsMember I see these on a pet food label that claims to be natural. Are these ingredients safe? What is your experience with them? Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In