Every living thing in your gut — and what it means.
A reference to the whole gut ecosystem — bacteria, archaea, fungi, parasites and viruses. See the microbes research links to any condition, with the direction of the shift and how strong the evidence really is.
5 domains · 19 organisms · 9 conditions · 11 influences · 12 neurotransmitters
The gut census
Who lives here — and why "what percentage" has two honest answers, by number and by weight.
Influences & rhythms
Diet, nutrients, stress, sleep, daily rhythm — each sorted by how much the evidence supports it.
The gut–brain axis
The neurotransmitters your bacteria help make — and how the traffic runs both ways.
Browse by domain
Explore conditions
Research associations, not a diagnosis.
Most links are correlational and studies often disagree — especially for parasites (commensal
or harmful) and viruses (mostly bacteria-infecting phages whose effects are indirect).
BiotaMD shows that uncertainty instead of hiding it, and flags popular claims the evidence
doesn’t support. For symptoms, see a clinician.