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So what do people think about Reptocal is it any good???
How often can I feed a turtle pellets with Reptocal on them???

I would assume you can offer it once every week or two, like you would if you were using cuttlebone for the calcium supplement.

1-2 Times every week in replacemnt of cuttlebone

Reptocal contains phosphates which is already available in just about everything the turtle eats. Reptiles need a 2 to 1 ratio of calcium to phosphate. Excess phosphates will inhibit the utilization of calcium by the turtle. I would recommend Rep-Cal instead since it does not contain any phosphates.

Reptocal contains phosphorus, a product like RepCal does not. I'd use a calcium supplement that doesn't contain phosphorus rather than one that does. RepCal is good, there are other calcium supplements that don't contain phosphorus as well.