[mrleinad]

Is the process to convert glucose into Vitamin C understood? Would it require something that could be seen as a tradeoff in our case?

[maxerickson]

Probably not a tradeoff. Scurvy is devastating and Wikipedia says an animal like a 70 kg goat makes ~13 grams of Vitamin C a day (which isn't very much of anything).

[jonhendry]

Scurvy might be devastating, but it's ridiculously easy to prevent. Especially nowadays.

[maxerickson]

Sure. I was responding to the tradeoff question. It just doesn't seem very likely that some animal survived because it wasn't making Vitamin C (the other case is some animal surviving even though it didn't properly make it).