Also if it goes rancid, would that make it smell? I've tried smelling it and there's no smell.
I can see the calcium separate from whatever solution is in it but that's probably normal for liquid forms I'd imagine? It's the only liquid calcium I've ever used before.
*Almost forgot to mention that it has always been refrigerated.
Chelated calcium is calcium bound to an organic acid, such as citrate, malate, lactate, or gluconate, glubiuonate; or to an amino acid, such as aspartate. Research indicates that calcium chelates, are more bioavailable than calcium carbonate.
Why not just dissolve calcium carbonate dust in water and give as a solution ? essentially , the can't dissolve very much calcium per litre so this is not a very effective way of getting calcium into your dragon. See viewtopic.php?f=6&t=236517&p=1817861#p1817861
Unfortunately the chelating compounds used oxidize on contact with oxygen in the air, hence the shelf life, beyond which the chelates have started to become rancid. Refrigeration will extend this because it will slow the oxidation reactions.