Strong second for gut health, sleep and minimizing immune load.
Yes, I would be cautious with it: One course of antibiotics can change your gut microbiome for years (New Scientist)
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Is this true for subantimicrobial amounts of doxy? e.g. 20mg BID?
Mikhail Blagosklonny said it was a good weekly idea… I have been been using at least 4 years.
Keeps all the parasites out of your system.
Maybe my nightly kefir at bedtime helps. 
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