Calcium: what about oyster shell calcium?

I've seen all the posts about Calcium Citrate and Carbonate. But do we as post-ops absorb the calcium in pills like Os-Cal, which say that the calcium is from oyster shell? The supplement I picked up also has vitamin D too. 2 pills = 1000 mg, the recommended dose. I haven't seen any discussion on this. These pills are much less expensive than the calcium citrate, and easier for me to get down too. Any advice would be appreciated! Thanks! =)

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