Apparently something I wrote earlier on the below topic died in the ether,
so:
 
There are three known situations in which C in dangerous in large amounts:
 
1. Rebound Scurvy: this occurs when large amounts are given over a long
time and then reduced IF the body continues dumping as much as it was
dumping before.  This is a documented problem but confuses some people since
the diet will contain what normally would be enough C to prevent scurvy.
 
2. C is considered to be preferentially taken up my the body over the B
vitamins.  If an individual has a diet low in any of the B vitamins or is
already poor at absorbing Bs (something which is documented with some
genetic groups and random indivudals) then the result could be same as not
getting enough of that (those) B(s).  Oh, that is as in multiple Bs, rather
than as in B.S.
 
3. Too much C injested and taken up is postulated to be able to interfere
with copper metabolism, with the normal consequences of that resulting.
 
B6 can cause neurological damage in large amounts over long periods.
 
There is no reason at this time to think that these problems might not also
be able to happen with ferrets, with some more likely than others.
 
This field is still badly understudied in many resepects even for humans
(which are the most studied) so expect there to be a LOT to still be
learned.
 
That said: use common sense.  We already know the human ancestral diet
which has a long (NOT talking what your great-grandparents ate here.<G>)
background (low amounts of flesh protein, low amounts of animal fat, some
crustaceans, many veggies, many fruits, nuts, etc.) is the safest diet for
most humans so it should make sense to all why trying to get close to the
ancestral diet for ferrets is the safest for most ferrets.  Also, recall
that the very elderly among humans appear to have different needs than
younger ones and that these needs many vary more greatly among individuals
in the very old -- so such special concerns might exist for very elderly
ferrets, too.
 
Sukie
[Posted in FML issue 2321]