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oyster shell calcium

i have read some things that oyster shell is not as good as pure calcium carbonate. what i have seen is that the calcium carbonate is more absorbable than the oyster shell. what does everyone think of this? i have a beardie and im getting a tegu soon. i want to make sure i am using the best calcium i can get. also how do you guys supplement d3? the calcium i use now is rep-cal with d3 but i want do get away from that due to the fact that d3 is toxic in high amounts. i also use the rep-cal multi vitamin but it does not have d3 in it.
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