For Pets
Shield
Daily immune nourishment for the animal you love — functional mushrooms, gentle enough for everyday food, built to keep their natural defenses well-supplied.
Your animal's body already carries a standing intelligence for defense — a network of surveillance cells that recognizes what belongs and what doesn't, and works quietly, every day, to keep them resilient. Immunity is not a remedy you reach for when something is wrong. It is a daily food for that native intelligence: a small spoonful stirred into the bowl that keeps the systems of recognition, balance, and renewal well-nourished, season after season. This is what the great fungal tonics have always been for — not a spike, not a fix, but a steady reserve of vitality the body draws on at its own pace.
What makes this formula worth reaching for is its completeness. Rather than lean on a single mushroom, we built Immunity from the full set — reishi, cordyceps, lion's mane, chaga, turkey tail, and agaricus blazei —, the same full-spectrum blend as our human formula, simply rendered at pet-safe concentrations. Each mushroom carries the family of compounds the body recognizes as familiar, and each adds a distinct character: deep beta-glucan richness, antioxidant density, the nucleosides of stamina and oxygen-use, the hericenones tradition prized, and fermentable polysaccharides the old fungal lore folded into the daily bowl. Together they cover more of the body's terrain than any one mushroom could alone.
You would reach for it for the healthy animal you simply want to keep healthy — the dog who travels and meets new dogs, the senior cat whose vitality you want to hold steady, the working or sporting animal whose body is asked for more, the bird or horse whose daily resilience you'd like well-supplied. It is gentle by design: food-grade culinary mushrooms, prepared as dilute hot-water extracts, scaled down to the smallest sensible dose and built up gradually. It is daily maintenance, not drama — the kind of quiet, steady support a body recognizes and uses.
And because it is grounded in the same fungal chemistry across all three of our kingdoms — People, Pets, and Plants — you can trust that what nourishes your own resilience is the same lineage nourishing your animal's, scaled with care for their smaller body and different physiology.
The characterized botanicals inside
Whole botanicals with compounds characterized in the scientific literature, used across centuries of traditional practice. We share the chemistry and the tradition — food and lineage, never a claim to treat any condition.
For Pets
Small-batch. Dual-extracted where it matters. Made by hand.
How to take it
Wellness dose by body weight — begin with the minimum, adjust as needed: ~1/16 tsp at 5 lbs · ~1/8 tsp at 10 lbs · ~1/4 tsp at 20–30 lbs · ~1/2 tsp at 40–50 lbs, daily, mixed into food.
Whole plant, never isolated
Concentrated extracts of the whole botanical — the way the body recognizes it.
Cited to measured biology
Every action we describe traces to the compound and its measured target.
Structure & function
We describe what an herb nourishes — never a claim to treat disease.
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What you get
What this formula gives you
Keeps your animal's natural immune defenses well-nourished and well-regulated, every day
Supplies a dense, full-spectrum antioxidant reserve (melanin, polyphenols, triterpenes) to support cellular resilience against everyday oxidative stress
Carries prebiotic fungal polysaccharides — the fermentable, microbial-feeding fraction the fungal tradition always kept close to the daily bowl
Supports steady energy, stamina, and recovery through cordyceps' role in the body's own cellular energy production
Adds lion's mane, the tradition's prized culinary mushroom, alongside the tonic mushrooms
Gentle, food-grade, and pet-safe by design — daily maintenance you can stir into the bowl without drama
How it works
The science of Shield
Not buzzwords — the actual chemistry of the plants in this formula: their characterized compounds and the proteins those compounds are measured to engage, every one cited.
The throughline of this formula is one of the most elegant facts in all of botanical medicine: the body recognizes mushrooms. Every one of these six is built, at the level of its cell wall, from beta-glucans — long, branched chains of glucose woven into a molecular architecture the mammalian body has been reading for as long as animals have lived and eaten among fungi. The innate immune system carries receptors shaped to recognize precisely these beta-glucan patterns; when a sentinel cell meets them, the body's own machinery of recognition is engaged and toned. This is the meaning of immunomodulation in the strict structure/function sense — the mushroom does not act upon the body or push its defenses in any single direction. It presents a familiar pattern, and the body's own immune intelligence reads it as information and uses it to support its natural, self-regulating balance. Turkey tail concentrates this into its renowned protein-bound polysaccharides (the PSP and PSK fractions), and agaricus blazei carries one of the densest beta-glucan reserves found anywhere in the fungal kingdom — which is why both are prepared as hot-water extracts, the form in which these water-soluble polysaccharides lift cleanly into the body's reach.
On top of that shared foundation of recognized beta-glucans, each mushroom contributes a distinct second signature, and it is the layering of these that makes the blend more complete than any one. Reishi adds its triterpenes — the bitter, oxygenated ganoderic acids that engage signaling targets in our molecular data (including the STAT3 node) and that the tradition tied to a grounded, composed character — placing reishi at the intersection of resilience and a steady stress response. Chaga brings an exceptionally concentrated antioxidant fraction: melanin, a broad spectrum of polyphenols, and triterpenes including betulinic acid drawn from its birch host, compound classes characterized for their role against everyday oxidative stress. Turkey tail's polyphenols echo that antioxidant character, while its fibrous, fermentable polysaccharides act as a prebiotic substrate — the kind of microbial nourishment the fungal tradition kept close to the daily bowl.
The remaining two reach beyond beta-glucans into vitality and stamina. Cordyceps is cultivated for its nucleosides — cordycepin and adenosine — and adenosine is the same nucleoside the body builds into ATP, the molecule every cell uses as energy currency, and signals through its own adenosine receptors; the established interest in cordyceps centers on its profile around the body's own cellular energy and its natural use of oxygen during exertion, which is why it is the stamina and recovery mushroom. Lion's mane carries two compound families found almost nowhere else — the hericenones and erinacines — long studied for their relationship with nerve growth factor (NGF), one of the body's own neurotrophic signals; alongside its own beta-glucans, this extends the formula's reach across the body's terrain. The result is a single blend layering antioxidant, energetic, and prebiotic character at once — every note traceable to a real compound in a real mushroom, food the body recognizes rather than anything aimed against a condition.
The molecules, measured
A formula is a community of compounds. Below are active molecules from the herbs in this blend and the proteins each is measured to engage — the precise points where the plants meet biology. So you see not just that it works, but how.
Ganoderma lucidum
Ganoderic acid A
PubChem ↗Measured to act on
An enzyme that locally regenerates active cortisol, shaping how tissues respond to the body's stress hormone.
An enzyme that quiets cortisol inside kidney and salt-handling tissues, helping govern fluid and mineral balance.
An enzyme that converts glucose into sorbitol, part of how cells handle sugar.
Ganoderic acid B
PubChem ↗Measured to act on
The enzyme that breaks down acetylcholine, resetting nerve and muscle signals between pulses.
A blood enzyme that breaks down acetylcholine and helps clear certain compounds from circulation.
An enzyme that converts glucose into sorbitol, part of how cells handle sugar.
Cordyceps militaris
Cordycepin (3'-deoxyadenosine)
PubChem ↗Measured in the lab: binds to Adenosine receptor A1 · Ki 7.12 µM
Measured to act on
A receptor for adenosine that helps calm cellular activity and signaling.
A repair enzyme that clears certain damage points so DNA can be mended.
Pentostatin (2'-deoxycoformycin)
PubChem ↗Measured in the lab: binds very tightly to Adenosine deaminase · Ki 1 nM
Measured to act on
An enzyme that breaks down adenosine, part of how cells recycle their building blocks.
Hericium erinaceus
Ergosterol
PubChem ↗Measured to act on
An enzyme that adjusts protein activity and helps the cell clear damaged material.
A cellular pump that escorts foreign compounds out of cells.
An enzyme immune cells switch on to make nitric oxide, a signaling molecule of the inflammatory response.
Inonotus obliquus
Betulinic acid
PubChem ↗Measured in the lab: binds tightly to Albumin · Kd 593 nM
Measured to act on
A receptor inside cells that helps direct immune cell development and daily body rhythms.
An enzyme that recycles the building blocks of DNA and cellular energy molecules.
An enzyme that helps repair and copy DNA to keep the genetic code intact.
Protocatechuic acid
PubChem ↗Measured in the lab: binds tightly to Carbonic anhydrase 2 · Ki 470 nM
Measured to act on
An enzyme that balances carbon dioxide and acidity throughout the body's fluids.
An enzyme that helps manage carbon dioxide and acid-base balance in the blood.
A bacterial enzyme in a pathway plants and microbes use that humans lack entirely.
Trametes versicolor
Ergosterol
PubChem ↗Measured to act on
An enzyme that produces nitric oxide as part of the immune and inflammatory response.
A liver enzyme that attaches sugar groups to compounds so the body can clear them.
Ergosterol peroxide
PubChem ↗Measured in the lab: binds to Nitric oxide synthase, inducible · IC50 6.3 µM
Measured to act on
An enzyme that converts glucose into sorbitol, part of how cells handle sugar.
An enzyme that produces nitric oxide as part of the immune and inflammatory response.
A receptor that senses bile acids and helps govern fat, cholesterol, and bile balance.
Agaricus blazei Murill
Ergosterol
PubChem ↗Measured to act on
An enzyme immune cells switch on to make nitric oxide, a signaling molecule of the inflammatory response.
A liver enzyme that tags compounds with sugar so the body can clear them.
A liver transporter that pulls compounds from the blood into liver cells for processing.
Ergosterol peroxide (5,8-epidioxy-ergosta-6,22-dien-3-ol)
PubChem ↗Measured to act on
An enzyme immune cells switch on to make nitric oxide, a signaling molecule of the inflammatory response.
An enzyme that converts excess glucose into sorbitol, part of how cells handle sugar.
A sensor that reads bile acid levels and helps govern fat and cholesterol balance.
Cited science · not claims
Everything we publish about these plants traces to a primary source — the compounds to PubChem, ChEMBL, and BindingDB, the traditional uses to named, dated herbals. We describe what a plant is and what it is understood to nourish — the body’s own systems, structure and function only. We do not claim it treats, cures, or prevents any disease, and nothing here is a substitute for professional care. See our method & sources →
These statements have not been evaluated by the Food and Drug Administration. Not intended to diagnose, treat, cure, or prevent any disease.
Why these herbs together
The shared mechanism
More than one botanical in this blend is measured to engage the same molecular targets. We share the convergent chemistry — characterized and cited, never a claim.
Reishi · Turkey Tail · Agaricus Blazei
Reishi · Chaga
Chaga · Agaricus Blazei
Each convergence is a gene whose protein two or more of this formula’s herbs are measured to engage (PubChem BioAssay & ChEMBL). It describes characterized molecular activity and the protein’s normal role — structure and function only, never a claim to treat, cure, or prevent any disease.
In practice
Who it’s for, and how to use it
Who it’s for
For the healthy companion animal whose vitality you want to keep steady — dogs and cats first, with the same gentle blend scaled for birds and horses. Reach for it for the traveler who meets new animals, the senior whose resilience you want to hold, the working or sporting animal asked for more, or simply any animal you'd like to keep well-supplied through the changing seasons. It is daily maintenance for a body that is already well, not a remedy for one that is unwell — and as with any potent botanical food, animals on prescribed medication, under a veterinarian's care, or with significant kidney or liver concerns (chaga is naturally high in oxalates) should be introduced only with veterinary guidance. Start at the smallest dose and build gradually.
How to use it
A wellness dose scaled to body weight, stirred into food once daily — begin with the minimum and adjust as needed: about 1/16 tsp at 5 lbs, 1/8 tsp at 10 lbs, 1/4 tsp at 20-30 lbs, 1/2 tsp at 40-50 lbs. Start low, build gradually over days, and give with a meal. The extract is genuinely potent, so a little goes a long way.
Measure · Wellness dose by body weight — begin with the minimum, adjust as needed: ~1/16 tsp at 5 lbs · ~1/8 tsp at 10 lbs · ~1/4 tsp at 20–30 lbs · ~1/2 tsp at 40–50 lbs, daily, mixed into food.
What’s inside
Inside: functional mushrooms — reishi, cordyceps, lion's mane, chaga, turkey tail, and agaricus blazei — each a food-grade 10:1 hot-water extract of the fruiting body. We chose this combination because each carries the beta-glucans the body recognizes while adding a strength the others don't: reishi's grounding triterpenes, chaga's antioxidant melanin and polyphenols, turkey tail's prebiotic protein-bound polysaccharides, cordyceps' energy nucleosides, lion's mane's nerve-supporting hericenones and erinacines, and agaricus' exceptionally dense immune polysaccharides. The same complete blend as our human formula, simply rendered gentle for the animal you love.
Structure-and-function support for animal nutrition and vitality. Introduce gradually and watch how your companion responds. Not intended to diagnose, treat, cure, or prevent any disease. If your animal is pregnant, nursing, or on medication, consult your veterinarian first.
Pairs well with
Formulas that share Shield's botanicals
Built from overlapping herbs, these reinforce Shieldalong the same lines — the shared-botanical kinship our genome engine maps.