Everyone is different. I took Zinc Sulphate capsules. I had no side effects and my taste was almost fully returned by 6 months. No way to prove it was the zinc, but no way to prove it wasn't either. Hope it works for your Dad.

Take care,
Eileen


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Aug 1997 unknown primary, Stage III
mets to 1 lymph node in neck; rt ND, 36 XRT rad
Aug 2001 tiny tumor on larynx, Stage I total laryngectomy; left ND
June 5, 2010 dx early stage breast cancer
June 9, 2011 SCC 1.5 cm hypo pharynx, 70% P-16 positive, no mets, Stage I