Reverse osmosis filter
For water filtration for city dwellers
Most of the experts we follow recommend it.
A reverse osmosis filter is recommended to reduce contaminants in tap water.
Who is behind it
Voices including a board-certified cardiologist, a clinical nutritionist and a registered nutritional therapist.
How strong the research is
Mostly expert experience so far, with published research still catching up.
In their words
“Reverse osmosis filters can strip out fluoride. The Berky filters can. There's some other companies that have filters that report to do that”
a board-certified cardiologist
To avoid fluoride exposure from tap water which can disrupt the oral microbiome and mitochondrial function, a high-quality water filter is advised.
Most tap water contains microplastics that add up with every sip.
Filtering water by reverse osmosis or distillation ensures it is free of toxins.
With care
Some of the minds attach conditions. These are worth reading before you begin.
Reverse osmosis removes aluminum but also minerals needed for hydration; mineral supplementation may be needed
Talk it through
Entrain shows what the experts teach, so you can make better decisions with your own clinician. It does not diagnose or prescribe. If something is worrying you, start there.
How this reading was made
Every line here comes from a doctor, scientist or coach speaking publicly, and links to the moment they said it. Entrain listens for where independent experts arrive at the same place on their own, and shows where they part ways. Mostly expert experience so far, with published research still catching up.
None of the statements here come with a declared commercial interest. Last refreshed 23 September 2026.
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