What Are Adaptogens? The Science Behind Ashwagandha, Reishi, Lion’s Mane, and the Herbs in Your Supplements

In 1947, a Soviet toxicologist named Nikolai Lazarev was trying to solve a military problem. The USSR wanted its soldiers, athletes, and cosmonauts to perform under extreme stress without breaking down. Stimulants worked short-term but burned people out. Sedatives kept them calm but useless. What Lazarev was looking for was a third category—something that would increase resistance to stress without the jittery upside of stimulants or the drowsy downside of sedatives. He called these hypothetical substances “adaptogens,” from the Latin adaptare—to adjust. The body wouldn’t be pushed up or pulled down. It would be helped to adapt.

That was almost eighty years ago. The term fell into obscurity in Western medicine, got picked up by the supplement industry in the 2010s, and is now plastered across every mushroom coffee, stress gummy, and wellness powder at your local health food store. Most of those products use the word “adaptogen” the way fast food restaurants use the word “artisan”—technically not wrong, but conveying almost nothing useful.

So let’s actually define it. Precisely. Because the word has a real scientific meaning that most of the marketing ignores.

The Actual Definition (Brekhman’s Criteria)

After Lazarev coined the term, it was his student, Israel Brekhman, who formalized the definition in the 1960s. Brekhman established three criteria that a substance must meet to qualify as an adaptogen:

1. It must be non-specific in its action. An adaptogen doesn’t target a single organ or pathway. It increases resistance to a broad range of stressors—physical, chemical, and biological.

2. It must be normalizing. This is the key distinction from stimulants and sedatives. An adaptogen brings deviated physiological parameters back toward homeostasis. If your cortisol is too high, a true adaptogen should help lower it. If it’s too low (yes, this happens—chronic fatigue, adrenal insufficiency), it should help raise it. The same compound, working in opposite directions depending on what the body needs.

3. It must be non-toxic. At therapeutic doses, an adaptogen should not cause significant side effects or disrupt normal biological functions. It helps without harming.

These criteria sound simple, but they’re actually quite demanding. Many herbs that get called adaptogens in marketing materials don’t meet all three. Caffeine increases stress resistance but it’s not normalizing—it pushes everyone’s cortisol up regardless of baseline. St. John’s Wort affects mood but it’s specific to serotonin pathways, not non-specific in action. Kava has anxiolytic effects but can cause liver toxicity at higher doses, failing criterion three.

The genuine adaptogens—the ones that survive Brekhman’s filter—are a smaller list than the supplement industry would have you believe. And the ones with strong modern clinical evidence are smaller still.

How Adaptogens Actually Work: The HPA Axis

To understand what adaptogens do, you need to understand the system they’re acting on. The hypothalamic-pituitary-adrenal (HPA) axis is your body’s central stress response machinery. When you encounter a stressor—a work deadline, a near-miss in traffic, an argument, even a hard workout—the hypothalamus signals the pituitary gland, which signals the adrenal glands, which pump cortisol into your bloodstream. Cortisol mobilizes energy, sharpens attention, suppresses non-essential functions (including immune response, digestion, and reproductive drive), and prepares you to fight or flee.

This is a brilliant system for acute stress. It’s a terrible system for modern life, where the “stressor” is your inbox and the “fight or flee” response lasts all day, every day, for years.

Chronic HPA axis activation leads to sustained elevated cortisol, which cascades into a remarkable number of problems: disrupted sleep architecture, impaired immune function, weight gain (especially visceral fat), reduced cognitive performance, mood disorders, and—the detail that connects adaptogens to everything else we write about—suppressed serotonin signaling and reduced neuroplasticity. Chronic stress literally makes your brain less flexible and less capable of the kind of positive adaptation that underpins mental health.

Adaptogens modulate the HPA axis at multiple points. A comprehensive review by Panossian and Wikman (2010) published in Pharmaceuticals mapped the molecular mechanisms: adaptogens influence cortisol production, modulate heat shock proteins, affect nitric oxide production, and interact with molecular chaperones that help cells maintain function under stress. The net effect is that your stress response still works when you need it but doesn’t stay chronically activated when you don’t.

This is also why adaptogens are slow. You don’t take ashwagandha and feel calmer in thirty minutes. HPA axis recalibration takes consistent use over two to four weeks. People who try an adaptogen for three days and quit because “nothing happened” have misunderstood the mechanism. This is hormonal remodeling, not symptom suppression.

Ashwagandha: The Most Studied Adaptogen

Withania somnifera. Also called winter cherry or Indian ginseng, though it’s not related to ginseng. Used in Ayurvedic medicine for over 3,000 years. Has more clinical research behind it than any other adaptogen by a significant margin.

The landmark study is Chandrasekhar et al. (2012), published in the Indian Journal of Psychological Medicine. Sixty-four adults with a history of chronic stress were randomized to receive either 300mg of ashwagandha root extract (KSM-66) twice daily or placebo. After sixty days, the ashwagandha group showed a 28% reduction in serum cortisol levels. Not self-reported stress. Measured cortisol in the blood. The group also showed significant improvements on all stress-assessment scales.

Since then, the evidence has only gotten stronger. Studies have demonstrated ashwagandha’s effects on sleep quality (improved sleep onset and quality in a 2019 trial), anxiety (comparable to cognitive behavioral therapy in some measures), testosterone levels in men (relevant for those with stress-suppressed testosterone), and exercise performance (increased VO2 max and strength in trained athletes).

For the depression and mood conversation specifically, ashwagandha’s cortisol-lowering effect is the key mechanism. High cortisol suppresses serotonin. Lower cortisol creates conditions where your existing serotonin can do its job more effectively. This is why ashwagandha shows up in mood-support formulas even though it’s not technically an antidepressant—it removes one of the major upstream obstacles to normal mood regulation.

In our Daydream blend, ashwagandha sits alongside L-theanine and 125mg of Golden Teachers. The logic is layered: ashwagandha recalibrates the HPA axis over weeks of use, L-theanine provides immediate alpha-wave calm within 30 minutes, and psilocybin promotes the neuroplastic flexibility that lets new, less-stressed patterns of thinking establish themselves. Different timescales, same direction.

Evidence strength: Strong. Multiple RCTs, consistent results, well-characterized mechanism. This is the adaptogen you can recommend with the most confidence.

Reishi: The Calming Fungus

Ganoderma lucidum. Called “the mushroom of immortality” in traditional Chinese medicine, which is an aggressive claim but reflects its 2,000-year reputation. Reishi isn’t a plant—it’s a fungus, a polypore mushroom that grows on hardwood trees. It qualifies as an adaptogen under Brekhman’s criteria: non-specific stress resistance, normalizing effects, and a strong safety profile.

The clinical evidence for reishi is real but more dispersed than ashwagandha’s. It spans immune modulation (reishi polysaccharides enhance natural killer cell activity), sleep quality (improved sleep in a randomized trial of patients with neurasthenia), and—most relevantly for a stress-and-mood context—interaction with GABA receptors that produces mild anxiolytic (anti-anxiety) effects without sedation.

The GABA mechanism is what makes reishi interesting in adaptogenic stacks. GABA is the brain’s primary inhibitory neurotransmitter—it’s the braking system. Benzodiazepines (Valium, Xanax, Ativan) work by amplifying GABA signaling. Reishi appears to interact with the same receptor system at a much gentler level: calming, but not sedating. Centering, not numbing.

In A psilocybin + lion’s mane formulation, reishi is the stabilizer ingredient. It keeps the cognitive enhancement from Lion’s Mane and the neuroplasticity from psilocybin grounded in a calm, focused state rather than tipping into anxious alertness. The combination makes more sense when you understand reishi’s mechanism: it’s not adding energy or sharpness. It’s adding the calm that lets energy and sharpness be useful rather than jittery.

Evidence strength: Moderate. Good mechanistic data, some clinical trials, strong traditional use evidence. More research needed, particularly large RCTs specifically measuring adaptogenic outcomes.

Lion’s Mane: The Neuroplasticity Outlier

Hericium erinaceus. Here’s where I should confess to a tangent that I think is actually the most important point in this article.

Lion’s Mane is not technically an adaptogen by the strict Brekhman criteria. It doesn’t primarily modulate the HPA axis or cortisol. It’s a nootropic—a cognitive enhancer. But it shows up in every adaptogen conversation, every adaptogen supplement, and every “adaptogenic mushroom” marketing campaign, so we need to address it honestly.

What Lion’s Mane actually does is more interesting than what the adaptogen label implies. A landmark 2023 study from the University of Queensland identified compounds in Lion’s Mane (specifically hericenones and erinacines) that stimulate nerve growth factor (NGF) production and significantly enhance neurite outgrowth in brain cells. In non-scientific English: Lion’s Mane helps your brain grow new connections and repair damaged ones.

This is neuroplasticity support, and it’s genuinely remarkable. NGF is one of the key molecules your brain uses to maintain and expand its neural circuitry. It’s essential for learning, memory consolidation, and—this is the depression connection—the formation of new thinking patterns that aren’t the depressive ones currently stuck on repeat.

The overlap with adaptogens isn’t in mechanism but in outcome. Adaptogens help your stress response system stop overreacting. Lion’s Mane helps your brain build the new wiring to support different responses. If adaptogens clear the road, Lion’s Mane builds new roads. And psilocybin—the compound that promotes default mode network flexibility and serotonin 2A-mediated neuroplasticity—is what drives down those new roads for the first time.

This is why these ingredients end up in the same capsule. Not because they’re all “adaptogens” (they’re not) but because they address complementary aspects of the same problem: a brain stuck in rigid, stress-driven patterns that needs help becoming flexible again.

Lion’s Mane at 275mg is the primary ingredient in Sidekick, where it’s paired with Reishi and Golden Teachers in what’s essentially the Stamets Stack—mycologist Paul Stamets' proposed neuroplasticity protocol. More on Lion’s Mane’s research on our Lion’s Mane apothecary page.

Evidence strength: Strong for NGF stimulation and cognitive benefits. Not technically an adaptogen, despite universal marketing as one. Strong enough that the miscategorization almost doesn’t matter.

Schisandra Berry: The Stimulating Adaptogen

Schisandra chinensis. One of the fifty fundamental herbs in traditional Chinese medicine. The Chinese name, wu wei zi, means “five-flavor berry” because it contains all five tastes recognized in Chinese herbal theory: sweet, sour, salty, bitter, and pungent. This isn’t a charming folk detail—the five-flavor profile reflects a complex phytochemistry with compounds affecting multiple physiological systems.

Schisandra is the adaptogen that surprises people because it’s energizing rather than calming. Most adaptogens (ashwagandha, reishi) have a centering, settling quality. Schisandra is different: it sharpens focus, combats fatigue, and improves physical endurance. Russian research from the Soviet era (this is where adaptogens got serious military funding) documented schisandra’s ability to improve performance under stress in soldiers and athletes.

Modern research supports the traditional use. Schisandra lignans (schisandrin B and related compounds) have demonstrated hepatoprotective effects (liver protection), anti-inflammatory activity, and cortisol-modulating properties. A 2010 review noted its ability to enhance physical and mental performance during conditions of stress without the overstimulation of stimulants.

In psilocybin microdose formulations, schisandra shows up in Brighten—the highest-psilocybin blend (250mg Golden Teachers) paired with schisandra berry for creative energy and mood elevation. The combination is deliberate: the psilocybin opens up sensory and creative channels while schisandra provides the focus and energy to actually do something with that openness. It’s the morning blend, the studio blend, the “I want to feel genuinely excited about my day” blend. Brighten isn’t for unwinding—that’s what Holiday is for.

Evidence strength: Moderate. Good mechanistic evidence, substantial traditional use, some modern clinical support. The Russian-era research is extensive but often not translated or not meeting current Western trial standards. More Western RCTs would strengthen the case.

Ginseng: The Grandfather Adaptogen

Panax ginseng (Asian) and Panax quinquefolius (American). The most widely consumed adaptogen on earth, with a research base spanning thousands of studies. If adaptogens have a patriarch, ginseng is it.

The evidence for ginseng is broad but sometimes shallow—there are studies on cognition, fatigue, immune function, sexual function, blood sugar, and exercise performance, but the quality varies enormously. The best evidence supports ginseng’s effects on mental performance under stress (improved reaction time, reduced mental fatigue in multiple controlled trials) and on fatigue generally.

The mechanism involves ginsenosides interacting with the HPA axis, modulating cortisol, and affecting dopamine and serotonin systems. Different ginsenoside fractions have different effects, which partly explains why ginseng can be both energizing and calming depending on the preparation.

Ginseng appears in A psilocybin + maca + cacao + ginseng formulation alongside maca root, ceremonial cacao, and 150mg of Golden Teachers—its role is energy restoration and physical vitality. When your body has genuine sustained energy rather than caffeine-and-cortisol emergency energy, everything downstream improves. More on our ginseng apothecary page.

Evidence strength: Strong, though the sheer volume of research includes plenty of low-quality studies alongside the good ones. For fatigue and mental performance under stress, the evidence is solid. For other claimed benefits, it’s more variable.

Rhodiola: The Fatigue Fighter

Rhodiola rosea. Another Soviet-era favorite, used by cosmonauts and military personnel. A 2012 systematic review of randomized placebo-controlled trials found rhodiola improved symptoms of stress, including fatigue, exhaustion, and anxiety.

What distinguishes rhodiola from other adaptogens is speed. While ashwagandha’s cortisol effects build over weeks, rhodiola studies show improvements in mental fatigue within days. It’s the adaptogen closest to a “take it and feel something” experience. Not in any current psilocybin microdose formulations, but worth knowing about if you’re building your own stack.

Evidence strength: Moderate to strong. Good RCTs for fatigue and stress. Smaller evidence base than ashwagandha’s but more consistent than most adaptogens.

Which Adaptogens Have Strong Evidence vs. Mostly Traditional Use?

An honest assessment, because the supplement industry won’t give you one:

Strong clinical evidence:

• Ashwagandha—Multiple large RCTs. Measurable cortisol reduction. Well-characterized mechanism. The adaptogen with the most robust Western evidence base.
• Rhodiola—Good RCTs for fatigue and cognitive performance under stress. Relatively fast onset.

Good evidence with caveats:

• Ginseng—Extensive research but variable quality. Best evidence is for mental performance and fatigue. Some studies are industry-funded.
• Lion’s Mane—Strong evidence for NGF stimulation and neuroprotection, but technically a nootropic, not an adaptogen. Gets miscategorized constantly.
• Reishi—Good mechanistic data, some clinical trials, excellent safety profile. Needs more large-scale Western RCTs.

Moderate to limited evidence:

• Schisandra—Substantial traditional use, Russian-era research, some modern support. Needs more Western RCTs.
• Holy basil, cordyceps, astragalus, eleuthero, shatavari—ranging from promising-but-early to mostly-traditional. Maca has good evidence for sexual function but through a non-adaptogenic mechanism.

The supplement industry treats all of these as equivalent. They are not. When a product label says “adaptogenic blend” and lists eight herbs, the honest question is: how many of those eight have clinical evidence for the specific claim being made? Usually one or two doing the heavy lifting and six along for the ride.

How Adaptogens and Psilocybin Work Together

This is the intersection that drives everything we do in psilocybin microdosing, so let me be specific about why these ingredients end up in the same capsules.

Chronic stress creates a physiological environment that’s hostile to mental health: elevated cortisol, suppressed serotonin signaling, reduced neuroplasticity, rigid default mode network activity. Depression, anxiety, and the general “stuck” feeling that brings people to our site are all downstream consequences of this environment.

Adaptogens address the stress infrastructure. Ashwagandha brings cortisol down. Reishi calms GABAergic overactivation. Ginseng restores energy reserves. They normalize the terrain.

Psilocybin addresses the neural rigidity. Through serotonin 2A receptor agonism, it promotes default mode network flexibility—the “shaking the snow globe” effect that researchers at Imperial College London have documented. Rigid patterns of thought get loosened. New connections become possible.

Lion’s Mane provides the raw materials. Through NGF stimulation, it supports the growth and strengthening of the new neural pathways that psilocybin opens up.

None of these alone is the full solution. Together, they create conditions for genuine change: the stress response calms down (adaptogens), new patterns become possible (psilocybin), and the brain has the building materials to make those patterns permanent (Lion’s Mane). Not a magic pill. An intelligent combination that meets your neurobiology where it actually is.

Every product in the lineup reflects this logic. Daydream: ashwagandha + L-theanine + Golden Teachers for calm mental clarity. Sidekick: Lion’s Mane + Reishi + Golden Teachers for cognitive performance. Brighten: schisandra + Golden Teachers for creative energy. Holiday: passionflower + Golden Teachers for deep nervous system relaxation. Bloom: maca + ginseng + cacao + Golden Teachers for physical vitality and sensory presence. Different adaptogens, same psilocybin backbone, each formula designed around a specific dimension of the “stuck-to-flexible” transition.

The word Lazarev coined in 1947—adaptogen, from adaptare, to adjust—turns out to describe not just what these herbs do individually, but what the entire stack does together. It helps you adjust. Not to accept a diminished life, but to rediscover the one your nervous system has been too clenched to notice. Colors a little brighter. Music a little richer. The walk to work with a texture it didn’t have yesterday. That’s adaptation in the direction that matters.