How to mix supplements

Hi everyone....my main problem is bad breath...I have had constipation my whole life and I think my bad breath is a result of my digestive problems. I have been reading a lot of posts on here and I plan on trying goldenseal with my meals to stimulate the digestive system. I have also started taking probiotics. I bought the GNC probiotic but it did not help too much....I remember having success with primal defense a while ago so I looked online and bought a different type of soil based probiotic. It is cheaper than primal defense but still pretty expensive.

Fortunately, the new probiotic made me go to the bathroom the same day I started taking it. I feel a lot better and I think that my breath is not that bad right now. I know that goldenseal is an antibiotic...how should I take both at the same time...I dont want to waste my money with the the probiotics...Should I take the probiotic first thing in the morning on an empty stomach and then take the goldenseal with my meal 20 min later? Would the goldenseal kill of the expensive probiotics I am taking now? Also, I am thinking about adding glutamine...when should I take that?