Cross-referencing clinical data
EarlyMyoviridae T4D
Myoviridae T4D.
Another bacteriophage strain in the PreforPro blend, targeting specific harmful bacteria in your gut. Selectively destroys targeted harmful bacteria in your gut using the most well-understood phage mechanism in science.
EarlyResearch strength15mgDaily amount
Reviewed March 2026
- Category
- General
- Also filed under
- Targets specific harmful gut bacteriaRelated to well-studied T4 phage familyPart of studied PreforPro blend
What Myoviridae T4D is, and what it does.
- Does it work
- T4 phage biology is rock-solid science (studied since the 1940s). But as a supplement ingredient, it's only been tested within the PreforPro blend. You can't separate its contribution from the other three phages.
- How much to take
- 15 mg as part of the PreforPro blend. T4D doesn't have standalone dosing because it's always delivered as part of the 4-phage cocktail.
- The first dose
- No perceptible effects. T4D phages begin infecting target bacteria within minutes of reaching the gut, but the scale is microscopic.
- With regular use
- Weeks 3-4: gradual improvements in digestive comfort as the bacterial balance shifts. Effects are subtle, not dramatic.
- How well tolerated
- Well tolerated. T4 phages have been studied for 80+ years. They can only infect specific bacteria. Zero ability to harm human cells.
- How it feels
- Invisible in the best way. You don't feel the phages. You notice the result: fewer random GI issues over time.
About 15mg a day is the studied dose.
How much to take a dayLimited data
15mg
The doseThe daily amount the trials actually used. A product at this figure is dosed right where the research is.
Above 15mgMore capsules, not more effect. Rarely in a serving anyway.
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
- Kills harmful gut bacteria selectively
- Enhances probiotic effectiveness
PubMedCochraneClinicalTrials.govNIH ODSSUPP.AILabs test. IngredientMD verifies.PubMedCochraneClinicalTrials.govNIH ODSSUPP.AILabs test. IngredientMD verifies.
Questions people ask about Myoviridae T4D.
- Why is T4 so well-studied?
- Right place, right time. When scientists in the 1940s needed a simple model to understand genetics, T4 was easy to grow and study. It became the E. coli of viruses.
- If T4 targets E. coli, will it kill my good E. coli?
- T4D targets specific E. coli strains. Not all E. coli are the same. The phage is selective even within E. coli species, hitting harmful variants while leaving beneficial ones.
- Can I just take T4 phage alone for gut health?
- You could, but it wouldn't cover enough ground. Gut health problems involve many bacterial species. That's why PreforPro uses four different phages.
- Is this related to phage therapy for infections?
- Same concept, different intensity. Phage therapy uses high concentrations of phages to treat active infections. Supplement phages are lower dose for general gut maintenance.
- How do phages avoid killing good bacteria?
- Lock and key. Each phage has proteins on its tail that only fit receptors on specific bacteria. If the key doesn't fit, the phage bounces off harmlessly.
- Do antibiotics kill phages?
- No. Antibiotics target bacteria, not viruses. Phages are viruses. However, if antibiotics kill the phage's target bacteria, the phages lose their food source and decline naturally.
Nothing to show here, and the reason why.
A pairing appears on this page only when a trial gave both ingredients together and measured the result. Myoviridae T4D has none that clears that bar.
No pairing for Myoviridae T4D has cleared review yet.
Stitching two separate single-ingredient studies into a pairing is the one thing this engine will not do. When a study of the combination itself holds up at source, it lands here with its citation.
No invented synergy. Where actives were studied on their own rather than together, the record shows each on its own evidence, never a combined effect no trial measured.
Research strength. Research strength says how much work stands behind the combination. It is never a product score.
Independent record. Every finding is cited to a named trial, dated, and never written by the brand.
20 pairings are live across the library today. Checked 20 July 2026.
Plays well withEstablished knowledge, not a trial
No study gave these as a pair, so they are not in the card above. But the reason they belong together is settled biochemistry, not a guess, so it is worth knowing.
Myoviridae T4D + PreforProsame phage cocktail
Myoviridae T4D is one of the lytic coliphage strains that make up the PreforPro preparation. The two describe the same class of material, so a formula listing both is describing one prebiotic phage input rather than two.
Myoviridae T4D + Probioticsprebiotic phage plus live culture
Lytic coliphages break open target Escherichia coli cells and release their carbon and nitrogen into the colonic lumen, which the surviving culture can take up. This is why phage preparations are formulated alongside live cultures rather than on their own.
Myoviridae T4D + Lactobacillus plantarumhost-specific lysis leaves lactobacilli untouched
T4-type phages attach to receptors found on coliform outer membranes and cannot adsorb to Gram-positive lactobacilli, so the culture passes through unaffected while competing coliforms are reduced. That selectivity is the reason the pair is used together.
Myoviridae T4D + Bifidobacterium longumnon-overlapping host range
Coliphages have no receptor on bifidobacteria, so the phage narrows the coliform population without acting on the bifidobacteria in the same capsule. Nutrients released by lysis are available to the resident bifidobacteria.
Myoviridae T4D + Lactobacillus acidophilusColiphage host range does not extend to lactic acid bacteria
T4-type Myoviridae adsorb to lipopolysaccharide and outer membrane receptors specific to Escherichia coli, structures that Gram-positive lactobacilli do not carry. That host restriction is why a coliphage preparation can be co-formulated with a lactobacillus without lysing it. The specificity is established phage biology; whether removing coliforms benefits the lactobacillus population is a separate and much weaker claim.
Myoviridae T4D + Saccharomyces boulardiiA yeast is not a bacteriophage host at all
Bacteriophages infect bacteria only, so a probiotic yeast is untouched by a coliphage preparation and the two can share a capsule. Saccharomyces boulardii is also acid tolerant and does not need the enteric protection a phage preparation may need. The compatibility is mechanical rather than a demonstrated combined effect.
Myoviridae T4D + Bifidobacterium lactisGram-positive organism outside the coliphage host range
Bifidobacteria lack the outer membrane receptors that T4-type phages recognise, so they are not lysed by a coliphage preparation. That makes them a routine co-ingredient in phage-containing blends. Co-formulation compatibility is the established part; an additive effect on colonisation is not.
Myoviridae T4D + InulinPrebiotic substrate for the resident population rather than for the phage
Inulin is fermented by bifidobacteria and other saccharolytic residents into short-chain fatty acids, a well-characterised prebiotic effect. A phage preparation works on a different axis, reducing a specific bacterial host rather than feeding anything. Blends pair them because the mechanisms do not overlap, not because a combination has been measured.
Myoviridae T4D + GOS (Galactooligosaccharides)Fermentable oligosaccharide with an established bifidogenic effect
Galactooligosaccharides resist digestion in the small intestine and are fermented in the colon, shifting the community toward bifidobacteria. Pairing that with a host-specific phage is a two-lever approach, feeding one group while reducing another. The pairing itself has not been measured in the sources available here.
Myoviridae T4D + Resistant StarchColonic fermentation substrate yielding butyrate
Resistant starch escapes small intestinal digestion and is fermented in the colon, with butyrate as a major product. It occupies a different niche from a phage preparation, which does not supply energy to anything. Read the combination as complementary in design rather than clinically demonstrated.
Myoviridae T4D + ButyrateDirect supply of the short-chain fatty acid that colonocytes use as fuel
Butyrate is the preferred energy substrate of colonocytes and is normally produced by fermentation of resistant carbohydrate. Supplying it directly bypasses the fermentation step, while a phage preparation acts on the bacterial population itself. The two do not interfere with each other.
Myoviridae T4D + Partially Hydrolyzed Guar GumSlowly fermented soluble fibre with a gentle gas profile
Partially hydrolysed guar gum ferments more slowly along the colon than inulin, producing less rapid gas formation. It is a common choice in blends aimed at people who tolerate inulin poorly. The pairing with a phage preparation is a formulation decision.
Myoviridae T4D + L-GlutaminePreferred fuel for enterocytes
Glutamine is the principal respiratory fuel for small intestinal enterocytes and a nitrogen donor for nucleotide synthesis in rapidly dividing mucosal cells. It is a common gut-formula companion to microbial ingredients because it acts on the host tissue rather than the microbes. The metabolic role is established; a combined effect is not something the available sources measure.
Myoviridae T4D + Zinc CarnosineChelate used for mucosal support, mechanistically independent of phage activity
Zinc carnosine is a coordination complex that dissolves slowly and releases zinc along the mucosal surface, which is why it appears in gut formulas. It has no interaction with phage particles. The pairing is complementary by design, and the mucosal work rests on its own separate literature.
Myoviridae T4D + Activated CharcoalNon-specific adsorbent that binds macromolecules in the gut lumen
Activated charcoal adsorbs a wide range of organic molecules and particulates in the lumen, and a protein-coated virus particle is exactly the kind of material it can bind. Taking the two at the same time is likely to reduce the number of viable phage reaching their target. Separating the doses is the sensible formulation answer, and this is a mechanistic expectation rather than a measured interaction.
Myoviridae T4D + Bentonite ClayLayered silicate binder with high surface charge
Bentonite carries a high negatively charged surface area that binds proteins and viral particles in suspension, a property used deliberately in water treatment. Co-administration with a phage preparation would be expected to reduce the delivered dose. This is mechanistic reasoning from the material's known behaviour.
Myoviridae T4D + Digestive EnzymesProteases degrade the protein capsid of a phage particle
A bacteriophage capsid is protein, and supplemental proteases are active in the upper gastrointestinal tract where a phage preparation is still transiting. High protease loads taken in the same dose are a plausible route to reduced viable particle counts. Formulators usually separate the two or use delayed release for this reason.
Myoviridae T4D + Betaine HClDeliberate lowering of gastric pH
Betaine hydrochloride is taken to raise gastric acidity, and phage particles vary widely in their tolerance of low pH. A preparation that is not acid-protected may lose viable count faster in a more acidic stomach. This is a mechanistic caution drawn from phage stability behaviour, not a measured clinical interaction.
Who should be cautious
Talk to a doctor before taking Myoviridae T4D if any of these apply to you: Individual strain effects unknown, Bacteriophage supplementation is still emerging. These are flags to check first, not effects Myoviridae T4D is known to cause.
Not medical advice. Show the label to your pharmacist.Getting Myoviridae T4D from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
Untreated waterSoilSewage (research context)
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
What the strongest studies found
The essence, in one line each.
- In a 4-week randomised, double-blind, placebo-controlled trial in 68 healthy adults, adding a bacteriophage blend containing T4D to a Bifidobacterium animalis subsp. lactis probiotic showed a within-group improvement in a self-reported gut symptom score (p = 0.01) and a larger rise in Lactobacillus and short-chain fatty acid producing bacteria than the probiotic alone.Randomised trial. Grubb et al., 2020 (Nutrients). PMID 32824480 ↗
These are the studies our verdict leans on, chosen from the 8 we read for Myoviridae T4D. The full linked list is below.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.
