Actually, Calci-Sand is one of the worst things you can buy. It is made out of calcium carbonate which is also used to neutralize stomach acid (Your bearded dragon is literally living on TUMS... Check out the ingredient list!). If a bearded dragon feels like it needs more calcium in its diet, it can get into the habit of eating this stuff... And the more they ingest, the more they neutralize their stomach acid, which just makes it more difficult to digest. Not to mention that Calci-Sand tends to harden like cement when wet.