DHEA - I took t for three months and noticed no difference to hair or skin... But would effect everyone differently as its a hormone/ hormone precursor or something (I think makes testosterone - hence the acne effect in some women). I do recall that if have pcos then it's possibly not good to take??
I personally didn't find it helped me.
Prednisone - I'd advise to take it in morning or at least by lunchtime. Charlotte Mooring prescribed me 25mg and said to take it morning time.