Probiotics?

Everyone talks about different probiotics.. It seems that primal defense and natures biotics are the same thing so why the difference in price and they talk about SBO's and HBO's what is the difference. Each of them don't mention anything other than different strains of acidophillus, which you can buy anyway. I can't get a straight answer from the makers, which makes me wonder about the validity of these products.

Does anyone know and what should I use?

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