For what its worth....
Benefits of vitamin D and during HCV treatment.
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Transpl Int. 2011 Jan;24(1):43-50. doi: 10.1111/j.1432-2277.2010.01141.x.
Vitamin D supplementation improves response to antiviral treatment for recurrent hepatitis C.
Bitetto D, Fabris C, Fornasiere E, Pipan C, Fumolo E, Cussigh A, Bignulin S, Cmet S, Fontanini E, Falleti E, Martinella R, Pirisi M, Toniutto P.