<a href=showthread.php?s=&postid=15125843#post15125843 target=_blank>Originally posted</a> by macclellan
Invertebrates and fish can't synthesize their own ascorbic acid, so it makes sense that it could be a beneficial supplement in aquaria (most fish food has it already). The predecessors of amphibians and reptiles produced ascorbic acid (in their kidneys). As far as warm-blooded animals, older orders of birds still use their kidneys, but newer orders use the liver. All mammals produced it in their liver - but humans, a few other primates, guinea pigs, bats, and a few birds lost the ability millions of years ago... Sometimes evolution sucks like that. Thank goodness for oranges.
Interesting, I read that it was benificial and it's cheap enough so I thought I would try it. I noticed a positve change in some fish and coral in as little as 2 weeks!!