Adaptogens for Dogs: Ashwagandha, Reishi & What Science Says

The word "adaptogen" has become one of the most buzzed-about terms in both human and pet wellness. Originally coined by Soviet pharmacologist Nikolai Lazarev in the 1940s to describe substances that increase non-specific resistance to stress, adaptogens are botanicals believed to help the body maintain equilibrium — modulating the stress response, supporting adrenal function, and promoting resilience across multiple physiological systems.

In the human supplement world, adaptogens like ashwagandha, rhodiola, and reishi mushroom have attracted enormous commercial attention. Now the pet industry is following suit, with a growing number of products promoting adaptogenic herbs for anxious dogs, senior dogs with declining vitality, and working dogs under physical stress. But how much of this is backed by science, and how much is marketing riding a human wellness wave? Let's look at the evidence carefully.

What Makes Something an Adaptogen?

For a plant to be classified as a true adaptogen, it traditionally must meet three criteria: it must be non-toxic at normal doses, it must produce a non-specific response that increases resistance to multiple stressors (physical, chemical, biological), and it must help normalise physiological function regardless of the direction of the imbalance. As reported in research covered by Science Daily, adaptogens work primarily by modulating the hypothalamic-pituitary-adrenal (HPA) axis — the hormonal cascade responsible for the body's stress response — as well as the sympatho-adrenal system.

This mechanism is relevant for dogs because canine stress physiology operates through the same HPA axis. Dogs exposed to chronic stressors — rehoming, Separation Anxiety: Causes, Signs & Treatment That Works">Separation Anxiety: A 4-Week Desensitization Plan">separation anxiety, loud environments, competitive agility, working roles — show measurable elevations in cortisol and related stress biomarkers. The theoretical basis for using adaptogens in dogs therefore has some logic behind it. Whether the compounds actually work as intended in canine biology is a different question.

Ashwagandha (Withania somnifera)

Ashwagandha is arguably the most researched adaptogen and the one with the most data in animal models. A well-cited study available at PubMed (PMID 32021735) reviewed the pharmacology of ashwagandha across multiple species, finding evidence of anxiolytic (anti-anxiety), anti-inflammatory, and neuroprotective effects. The active compounds — primarily withanolides — have been shown to modulate GABA receptors and reduce cortisol output, which in theory would be beneficial for anxious dogs.

In animal studies (primarily rodents), ashwagandha has demonstrated reductions in stress-induced physiological changes, improved physical endurance, and anti-inflammatory activity. The challenge is that canine-specific controlled trials are sparse. As The Guardian noted in its comprehensive review of adaptogen science, even the human research, while promising, often relies on small studies with variable quality. Extrapolating to dogs requires additional caution.

Ashwagandha also carries some cautions for dogs: it has thyroid-stimulating effects and should not be given to dogs with hyperthyroidism. It may also interact with sedatives and thyroid medications. Dosing for dogs has not been standardised.

Reishi Mushroom (Ganoderma lucidum)

Reishi is a medicinal mushroom used in traditional Chinese medicine for thousands of years. Its bioactive compounds — beta-glucans, triterpenes, and polysaccharides — have immune-modulating, anti-inflammatory, and adaptogenic properties. Unlike some adaptogens with primarily anecdotal bases, reishi has a more substantial body of research in mammals.

Beta-glucans from reishi have been studied in veterinary contexts and show evidence of immune system enhancement, particularly in the context of cancer support. Several veterinary oncologists have incorporated medicinal mushroom extracts into integrative protocols for dogs undergoing chemotherapy. The American Kennel Club acknowledges that certain herbs and mushrooms" title="Can Cats Eat mushrooms" title="Can Dogs Eat Mushrooms? Store-Bought Yes — Wild Mushrooms Are Potentially Fatal">Mushrooms? Store-Bought vs Wild">mushrooms show genuine veterinary interest, while cautioning that quality and standardisation of products varies enormously.

Reishi is generally considered safe for dogs at appropriate doses, with few reported adverse effects. However, it can have mild blood-thinning properties and should be discontinued prior to surgery. Product quality is a significant concern — many mushroom supplements contain mostly mycelium grown on grain rather than the fruiting body, which contains the highest concentrations of bioactive compounds. Look for products specifying "fruiting body" and providing beta-glucan content on the label.

Rhodiola Rosea

Rhodiola is a high-altitude plant used traditionally to combat fatigue and improve stress tolerance. In humans, it has evidence for reducing mental fatigue and supporting athletic recovery. For dogs, the data is nearly nonexistent. While the mechanism of action — stimulating serotonin, dopamine, and norepinephrine while modulating cortisol — is theoretically relevant, canine neurotransmitter pharmacology differs from human, and safe dosing is entirely unstudied in dogs. I would not recommend rhodiola for dogs until species-specific research exists.

Holy Basil (Tulsi) and Eleuthero

Holy basil has traditional use for anxiety and inflammation, with some small animal studies suggesting anti-stress effects. Eleuthero (Siberian ginseng) has a somewhat larger body of research supporting its adaptogenic classification, though again, specific canine data is limited. As reviewed by Benzie and Wachtel-Galor (PMID 28266134), the evidence for herbal adaptogens across species shows consistent mechanistic plausibility but uneven clinical validation. The same honest summary applies to canine applications.

What to Look for in an Adaptogenic Dog Product

If you decide to explore adaptogens for your dog — particularly for anxiety, immune support, or healthy ageing — look for the following in any product:

• Species-appropriate formulation: Products designed specifically for dogs, not human supplements repurposed for pets.
• Third-party testing: Lab verification of ingredient identity, purity, and potency.
• Standardised extracts: Products specifying the percentage of active compounds (e.g., withanolides in ashwagandha, beta-glucans in mushrooms).
• Veterinary oversight: Ideally, a product developed or endorsed by veterinary herbalists or integrative veterinarians.
• Transparent THC/contaminant levels if the product includes hemp-derived ingredients.

The BBC Future has highlighted that even in human use, the adaptogen category suffers from enormous quality variability — many products don't contain what they claim on the label, or contain it in amounts too small to have any biological effect. The same problem is magnified in the pet supplement industry, which is regulated less stringently than human supplements.

The Natural Wellness Approach: Supporting Stress Holistically

Adaptogens are not a substitute for addressing the root causes of stress in dogs. Environmental enrichment, consistent routine, positive training, appropriate exercise, and social interaction remain the pillars of canine wellbeing. Herbal support can be a complementary layer — but should be approached as exactly that: complementary.