So glad surgery is behind you and his healing is well underway! I can't offer thoughts on supplement question, Jim wouldn't even take an aspirin before he got sick. I do know sometimes you have to take matters into your own hands so long as there won't be any bad reaction to something prescribed especially if it helps him feel good. The trach tube does take practice but once I got the hang of it Jim wouldn't let the docs or nurses touch it. I know I babied him...but I'm glad I did.
Your dad is lucky to have such a caring daughter. Take care!