Suppositories with Theopylline 500mg and Promethazine 30mg Decolor Pink. Do I add ascorbic acid?

I found following composition:

Each rectal suppository contains 12.5 mg or 25mg promethazine HCl with Ascorbyl palmitate, silicon dioxide, white wax, and cocoa butter.

So, as I expected, it uses an Antioxydans used for Oli ë N and Fats. I mention butylhydroxyanisole and BHT or Butylhydroxytolulene and propyl gallate. Ask your supplier of raw materials what they can deliver.