I think the *check with your doctor* is something that helps them avoid any legal issues with things they write.Unless there is an allergy to milk I can not imagine the kefir causing a problem.
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No,they do not seem to sell anything in pill or powder form,but I have read the *activity* of such probiotics is far lower than that of the live cultured milk and soy products.
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You are lucky your child takes the lifeway.My son will only drink it as a medicine in one of those medicine measuring cups,lol.