Dr Ball was asking about vit C for ferrets.  It has been recommended
for use in ferrets with lymphoma anecdotally.  To quote from the book
(Essentials of Ferrets)
 
" Vitamin C (25-50 mg/kg BID PO) is used in the buffered, ester, or
  chelated form as it causes less GI upset.147  Start at 100 mg q 12
  hrs and gradually work up to the highest dose (over several weeks)
  that does not cause soft stools.  Mixing powder from capsules with
  food works well. Liquid vitamin C is usually available at health
  stores, and many pets take it readily. "
 
Karen Purcell DVM
Author of Essentials of Ferrets: A Guide for Practitioners
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Uxbridge, MA
[Posted in FML issue 3319]