Ferment accidents
A phage can collapse a yoghurt vat by killing the starter. Dairies rotate strains for that reason.
Phages already police the bacteria in fermented foods and in your gut. You do not need to buy them as a lifestyle powder.
Food-industry use of phages against Listeria on some meats exists as regulated products in some countries. That is factory hygiene, not a kitchen protocol from this page.
Everyday uses
River and sewage counts
Coliphages are used as water-quality indicators because they track faecal bacteria conceptually.
Gut virome chatter
Sequencing finds thousands of phage genomes in stool. Function for most is still a guess.
Teaching DNA
School films of T4 landing are how many people first see a virus as a machine.
Not a hand sanitiser
Phages on skin would need matching bacterial hosts. Soap still wins for hands.
News about therapy
Read for hope and limits. Matching, regulation and resistance are the real plot, not a miracle spray.
If a bottle claims to 'unleash phages in your bloodstream', treat it as marketing until a clinician and a regulator say otherwise.
Keep exploring
More in Tree of microbes
Bacteria
Single-celled prokaryotes with cell walls ? the oldest widespread life form, and both partners and pathogens.
Familiarity 95Viruses
Packets of DNA or RNA that are not cells — they replicate only inside living hosts.
Familiarity 96Fungi
A eukaryotic kingdom of yeasts, moulds and mushrooms — chitin walls, external digestion, partners of plants.
Familiarity 80Archaea
A prokaryotic domain that is not bacteria — methanogens, extremophiles and no known human pathogens.
Familiarity 35Protozoa
Motile unicellular eukaryotes — a teaching grade that includes pond ciliates and a minority of serious parasites.
Familiarity 58