My apologies...I confused the ZooMed with the RepCal. Some of the names are so similar. I thought the Zoo Med product was a new formulation of RepCal.

The only two cons I've ever heard to oyster shell was that oyster shell tablets had issues because the tablets were hard pressed and not easily dissolved. The other issues is that oyster shell and dolomite can contain lead and other forms of heavy metals.

Whenever I'm making a decision, I do my research and then make the best decision I can. People can only give you their opinion or their interpretation of facts. You've read an article with a point of view. You can contact the RepCal company and ask them about any safety concerns with their product. Be specific and ask them why some people say oyster shell is undesirable. I bet you get a response within 48 hrs. If you still can't get a satisfactory answer to your dilemma, best to throw out what you have and start over. What's $20 for piece of mind? There's no sense in using something if you're always wondering if it's the best product or it's harmful to your animal.

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