Probiotics (plz advise)

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Hi, can someone tell me if it's good to alternate probiotics? And how often

please? Which ones do you use ? Any good or bad effects , my son has high

oxalates and from what I read VSL is good as it's breaks them , Can i use it for

my son (yeasty) for a long time? I once gave him ther-Biotic Detoxification

Complete but he seemed uncomfortable with it, I took it myself and it seemed to

increase yeast..

Anyfeedback will be appreciated,

Thanks a lot,

Nafissa