Adaptogens for Cats

Reishi’s fungal compounds, actual feline findings and a full formula for cellular energy and healthy aging

By La Petite Labs Editorial 17 min read

As Seen On

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Contents

“Adaptogens for cats” usually refers to herbs or fungi chosen with the intention of helping the body handle stress. Reishi is one of those fungi. Its compounds have prompted research into immune and gut biology, but that is a different question from whether it makes a frightened cat feel calm. 2 5

Hollywood Elixir includes reishi within a 17-active formula for cellular energy, antioxidant support and healthy aging. The prepared combination brings fungal ingredients together with an NAD+ system, vitamins and other nutrients for your cat’s daily food. 13

Reishi is a mushroom, and the preparation matters

Reishi, commonly called Ganoderma lucidum, is a fungus with a long history in Asian traditional medicine. The word adaptogen describes the intention behind its use, rather than a single chemical or a uniform effect shared by every product. 5

For a cat owner, the useful starting point is the actual preparation. A product can contain mushroom material, an extract or a mixture with other ingredients. The mushroom name alone does not tell you the composition of the portion.

This makes reishi a specific ingredient choice within a wider nutrition plan. Its role in antioxidant supplements for cats belongs alongside the rest of the formula and the goal you want it to serve.

Woman kneeling with two long-haired tabby cats while holding a Hollywood Elixir box beside a food bowl

Polysaccharides and beta-glucans are related terms

Mushroom cell walls contain complex carbohydrates called polysaccharides. Glucans are among them, and they can have alpha or beta forms. Their structures and amounts vary between mushrooms and preparations. 1

A label stating “35% polysaccharides” therefore describes a broader category than a beta-glucan measurement. It does not establish that the ingredient contains 35% beta-glucans.

That distinction helps you read a reishi label accurately. Keep the named compound, the percentage and the amount of ingredient together; they answer different parts of the composition question.

Woman exercising beside a tabby cat, with a Hollywood Elixir box and food bowl on a small table

A powder can also be an extract

One cat owner researching reishi was unsure whether whole mushroom powder differed from the dry extract inside a capsule. They also asked about mixing it with hot water and about a warning found through an online search. The replies offered conflicting advice.

Powder describes a physical form; extract describes processing. An extract can be dried into a powder. Extraction methods affect which compounds are recovered and their properties. 1

Use the actual label and preparation instructions to resolve that choice. Boiling an already formulated supplement at home is not a substitute for knowing what it contains, and a capsule’s amount should not be converted into a feline portion by guesswork.

Orange-and-white cat reaching toward a woman holding a Hollywood Elixir box while sitting in a chair

A new feline trial tested a specific mushroom blend

In 2026, a blinded trial assigned 20 healthy cats to placebo or turkey-tail, red-reishi and lion’s-mane water extracts with bovine colostrum for 12 weeks. 2

The blend lowered blood triglycerides, changed gut microbes modestly and left stool characteristics unchanged. IgA decreased while rising in controls.

Three authors had Standard Process affiliations. The preparation and outcomes differ from isolated reishi, Hollywood Elixir or a calming trial.

Gray-haired man holding a Hollywood Elixir box while two cats rest beside him in an armchair

Immune activity and emotional calm are different goals

An immune measurement describes part of the body’s defense system. A change in gut bacteria describes another biological response. Neither, on its own, tells you whether a cat feels safer during a visit, a move or an encounter with another cat.

Likewise, oxidative stress refers to reactive molecules and cellular defenses. It is not another name for fear. 8 Nutrition for cellular protection has a useful purpose without promising to change an emotional response.

If your original question is about anxiety, start with the stressed-cat guide. If it is about daily nutrition for healthy aging, the full formula later in this article addresses that different goal.

Beta-glucans are one type of mushroom polysaccharide; a total-polysaccharide percentage does not tell you the beta-glucan amount.

New aggression or hiding needs its own explanation

In another owner discussion, the caregiver of a seven-year-old FIV-positive cat asked about brain-health supplements after new stress and aggression. That individual question shows how quickly an ingredient search can become a search for the cause of a change.

Fear, pain and frustration can affect feline behavior. 4 New aggression or withdrawal deserves assessment rather than an assumption that the cat needs an adaptogen. Our guide to cats hiding illness explores that concern.

If a medicine such as gabapentin is part of the care plan, keep its purpose distinct from a nutritional supplement. A reishi-containing formula is not an interchangeable way to manage the same problem.

Tabby cat looking up at a Hollywood Elixir sachet held above it, with the product box on a small table

Give your cat places to feel secure

The Feline Veterinary Medical Association recommends an environment that gives cats safety and control. Practical steps include hiding and elevated resting places, separated food and water stations, accessible toileting areas and opportunities to play. 4

In a multi-cat home, distribute those resources so one cat does not need to pass another to reach everything it needs. Keep interactions predictable and suited to the individual cat’s preferences.

Those changes address the cat’s surroundings directly. Alongside routine veterinary care for senior cats, they help give a daily nutrition plan a sound place in the cat’s life.

Hand gently petting an orange-and-white cat beside a food bowl and Hollywood Elixir box

Keep the accepted complete meal at the center

Cats have specific requirements for protein, amino acids and other nutrients. A complete food supplies the foundation for meeting them. Fungi are not plants, and a small mushroom ingredient has a different role from replacing a meal’s essential nutrition. 7

A healthy-aging addition should fit food your cat willingly eats. If the supplement changes a favorite meal enough that the cat refuses it, acceptance needs attention before adding more ingredients. See the senior-cat appetite guide when eating itself has changed.

The guides to feline nutrition and cat vitamins and supplements help separate the complete diet from the purpose of an additional formula.

Man holding a Hollywood Elixir box beside a black cat, an orange tabby and a food bowl

Rhodiola is a different ingredient with different research

Rhodiola rosea is a plant traditionally used for fatigue and performance under stress. It is not another form of reishi. The US National Center for Complementary and Integrative Health says the human evidence is not reliable enough to establish its usefulness for a health purpose. 6

That human literature does not provide a reishi-versus-rhodiola ranking for cats. Nor does the shared “adaptogen” label make portions or expected effects interchangeable.

Choose the actual preparation and the job it is intended to do. Hollywood Elixir’s declaration includes reishi; it does not include rhodiola. 13

What Hollywood Elixir’s reishi amount means

A full 2.5 g sachet of Hollywood Elixir contains 25 mg of reishi mushroom powder extract standardized to 35% polysaccharides. It separately declares 50 mg of beta-1,3/1,6-D-glucan from Saccharomyces cerevisiae, a yeast source. 13

Those are two distinct ingredients. The reishi percentage is not a separate beta-glucan assay, and the yeast ingredient should not be described as mushroom beta-glucan.

Read these amounts as part of Hollywood Elixir’s own composition. They are not a match to the mixed preparation used in the feline trial. The complete ingredient guide shows how they fit the whole formula.

In a 12-week study of healthy cats, a mushroom-and-colostrum blend changed gut microbes and lowered blood triglycerides.

Silver tabby sitting beside a food bowl and a Hollywood Elixir box held in a person's hand

DVM Voice: Clinical Vignette of a Common Pattern in Senior Cat Aging

Case provided by JoAnna Pendergrass, DVM

Sasha, a 12-year-old cat, was brought in after her owner noticed increased thirst and urination, lethargy, vomiting, and a generally unkempt appearance. Examination showed weight loss, elevated blood pressure, and reduced vitality.

Diagnostic testing revealed elevated kidney markers, poorly concentrated urine, and protein loss in the urine — findings consistent with chronic kidney disease, one of the most common chronic conditions in senior cats.

Her care required a kidney-focused diet, blood pressure management, targeted supplementation, medication support, and regular monitoring — a necessary plan, but one started after clinical signs were already visible.

Clinical takeaway: Sasha’s case reflects why senior-cat wellness should begin before obvious decline. Earlier monitoring, body-condition tracking, hydration awareness, antioxidant support, and daily cellular resilience may help support quality of life as cats age.

Single-case vignette. Not generalizable. Veterinary diagnosis and monitoring are essential for increased thirst, urination, vomiting, lethargy, weight loss, or suspected kidney disease.

Explore Hollywood Elixir Research →
Woman holding a Hollywood Elixir box toward a brown cat perched on the back of a sofa

Hollywood Elixir brings healthy-aging nutrition together

Hollywood Elixir combines 17 actives for daily cellular energy, antioxidant support and healthy aging. Reishi and yeast beta glucan belong to its immune-support purpose, alongside an NAD+ precursor, mitochondrial cofactors, vitamins and other antioxidant ingredients. 13

Choose the full combination when you want nutrition for the ordinary work of using food energy and protecting cellular material, with the ingredients already prepared for one daily food portion. There is no need to assemble separate reishi, NR, CoQ10, glutathione and vitamin products.

These roles explain the formula’s nutritional purpose. They do not establish a clinical trial result for finished Hollywood Elixir. The senior-cat supplement guide places that choice within broader care.

Woman leaning toward a fluffy orange cat beside a Hollywood Elixir box and green food bowl

NAD connects food with usable cellular energy

Food supplies energy through protein, fat and carbohydrate. Cells use NAD+ and NADH to carry electrons through reactions involved in turning that food energy into usable cellular energy. 7 9

Hollywood Elixir contains NR, which cells can convert through NMN into NAD+. CoQ10 serves as an electron carrier in the mitochondrial respiratory system. Riboflavin supplies the building material for FMN and FAD, cofactors used by enzymes. 10 11 12

The formula brings those roles together with B3, B6 and B12 and its other ingredients. 13 Reishi is therefore part of a broader daily nutrition choice, with energy metabolism represented alongside immune-health and antioxidant support.

See how cells make, use and recycle NAD+ in our NADome and NADomics guide.

Tabby cat licking its nose beside a food bowl and Hollywood Elixir box

Antioxidant nutrition supports cellular protection

Reactive oxygen molecules participate in normal signaling and metabolism. When their production exceeds the defenses managing them, they can damage cellular material. Glutathione works with enzymes that process peroxides, and NADPH supplies reducing power for glutathione recycling. 8 9

Hollywood Elixir combines reduced glutathione with vitamin E, vitamin C, an astaxanthin preparation, resveratrol, quercetin, blueberry fruit powder and spirulina. 13 These ingredients sit alongside the formula’s energy-related nutrients, rather than asking one mushroom to perform every role.

The oxidative-stress guide explains that cellular process. Its nutritional purpose is protection and maintenance, distinct from promising that a cat will hide less or tolerate noise better.

All 17 actives in the prepared formula

The manufacturer declares these amounts per full 2.5 g sachet: 13

  • Astaxanthin 2% (natural): 2 mg
  • Vitamin E, D-alpha Tocopheryl Acid Succinate 1210: 15 IU
  • Beta glucan, beta-1,3/1,6-D-glucan from Saccharomyces cerevisiae: 50 mg
  • Coenzyme Q10 98%, ubidecarenone: 40 mg
  • Vitamin B12, methylcobalamin trituration 1% on DCP: 0.25 mg
  • Nicotinamide riboside tartrate: 60 mg
  • Reduced L-glutathione: 50 mg
  • Resveratrol extract, standardized to 98% from Polygonum cuspidatum: 15 mg
  • Quercetin dihydrate 95%: 25 mg
  • Reishi mushroom powder extract, standardized to 35% polysaccharides: 25 mg
  • Organic spirulina powder: 50 mg
  • Vitamin B3, niacin: 2 mg
  • Vitamin B6, pyridoxal 5-phosphate: 1 mg
  • Vitamin B2, riboflavin USP: 0.5 mg
  • Blueberry fruit powder: 50 mg
  • Whey protein isolate 90%: 250 mg
  • Vitamin C, ascorbic acid: 10 mg

The astaxanthin and B12 amounts refer to the named preparations, not the same masses of pure astaxanthin or B12. Blueberry is declared as fruit powder, rather than an isolated anthocyanin amount.

Additional ingredients are chicken flavor, chicken liver powder, yeast extract, glycine and hydroxypropyl beta-cyclodextrin. The whey contributes a protein ingredient within the formula; the regular meal remains responsible for overall protein and energy nutrition.

Choose the daily portion and respect food preferences

Hollywood Elixir’s directions for adult cats use these daily weight bands: 14

  • Under 7 lb: half a sachet
  • 7–30 lb: one sachet
  • Over 30 lb: two sachets

Mix the portion into food and serve immediately. Use for kittens or pregnant or nursing pets is veterinarian-directed. The amount of each ingredient follows the portion given, rather than assuming every cat receives the full-sachet declaration.

In the FIV-owner discussion above, a commenter described a different mushroom powder that discouraged their cat from eating its usual food. That is an individual acceptance experience, not a finding about every mushroom product. Keep your cat’s willingness to eat central to the choice; a familiar, accepted meal makes daily nutrition practical.

Tabby cat sitting at a table with a food bowl and Hollywood Elixir box

Use the complete label and available quality reports

A useful label identifies the mushroom preparation, the whole formula and the amount in the daily portion. It also lets you see other animal ingredients: Hollywood Elixir includes whey and chicken ingredients, which matter if a cat has specific food sensitivities. 13

La Petite Labs states that Hollywood Elixir is made in the USA in a cGMP-compliant, NASC Preferred Supplier facility, with third-party heavy-metal and microbial-contamination checks. Its COA lookup provides access to batch-linked reports. 15

Use that information to answer composition and manufacturing questions. Clinical findings still belong to the actual preparation tested, while the full label shows what you are choosing for your cat.

Woman cuddling a silver tabby and a cream-colored cat while holding a Hollywood Elixir box

Review medicines and specific health conditions

Veterinary mushroom guidance advises avoiding use with a mushroom allergy and reviewing bleeding, liver, kidney and immune-mediated conditions. It flags anticoagulants, NSAIDs, immune-modulating medicines and diabetes drugs for individual review. 3 The immune-health guide and immunomodulation guide explain related questions.

Start one new product at a time so you can attribute changes accurately. Bring the complete label and portion to the review.

The first owner’s one-month liver warning came from a human MSD chapter. That source does not establish a feline duration limit or guarantee longer use is safe. 5 Keep the advice tied to the actual cat, preparation and health history.

Choose reishi within full healthy-aging nutrition

Choose Hollywood Elixir’s 17-active formula for daily cellular energy, antioxidant support and immune-health nutrition, with reishi included in the prepared combination. Its NAD+ system, mitochondrial cofactors, vitamins and fungal and plant ingredients bring complementary roles to your cat’s food. 13

Keep an accepted complete meal, a secure environment and individual health care alongside it. This is a direct way to add the full healthy-aging combination without piecing together separate ingredients.

Explore the wider longevity-supplement guide for cats, or choose Hollywood Elixir for daily cellular energy and healthy-aging nutrition.

Hollywood Elixir combines 17 actives for daily cellular energy, antioxidant support and healthy aging.

Educational content only. This material is not a substitute for veterinary advice. Always consult your veterinarian about your cat’s specific needs. These statements have not been evaluated by the Food and Drug Administration. Products mentioned are not intended to diagnose, treat, cure, or prevent any disease.

Glossary

  • Adaptogen: An herb or fungus used with the intention of helping the body handle stress; the term does not establish a shared clinical effect.
  • Reishi: A mushroom commonly identified as Ganoderma lucidum.
  • Polysaccharides: Complex carbohydrates made from linked sugar units.
  • Beta-glucans: A group of polysaccharides whose structures and amounts vary by source and preparation.
  • Extract: Material obtained by separating selected compounds from a starting ingredient.
  • IgA: An antibody measured in some immune studies.
  • NAD+/NADH: A cofactor pair involved in cellular energy metabolism and other reactions.
  • Oxidative stress: An imbalance between reactive-molecule production and the defenses managing it.

Related Reading

Aging & Senior Cat Guidance
• Cat Age Calculator: Cat Years to Human Years
• Cat Lifespan by Breed
• Lethargy in Cats
• Senior Cat Not Eating
• Cat Drinking A Lot
• Why Is My Senior Cat Withdrawn?

Healthy Aging Support
• NAD+ for Cats
• NMN for Cats
• Vitamins For Older Cats
• Senior Cat Food

References

Numbered references identify the sources used for specific claims. Read the study design, species and evidence boundaries alongside each finding.

  1. János Vetter. The Mushroom Glucans: Molecules of High Biological and Medicinal Importance. 2023· DOI 10.3390/foods12051009Evidence boundary: A review of fungal glucan structures, extraction and measurement.↩ 1 · ↩ 2
  2. Broughton MG et al. Effects of a mushroom-based β-glucan blend on the gastrointestinal health and immune function of healthy adult cats. 2026· DOI 10.1093/jas/skag259Evidence boundary: A 12-week study of a mushroom-extract and colostrum mixture in healthy adult cats.↩ 1 · ↩ 2 · ↩ 3
  3. Alison Hamilton, DVM; Rania Gollakner, BS, DVM, MPH. Medicinal Mushrooms. 2026Evidence boundary: Veterinary guidance on medicinal mushroom preparations and individual precautions.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4
  4. Feline Veterinary Medical Association. Setting Up the Environment for Success. n.d.Evidence boundary: Professional guidance on feline behavior, environmental resources and positive interaction.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4
  5. Laura Shane-McWhorter, PharmD. Reishi. 2025Evidence boundary: Human information on reishi’s traditional use and safety considerations.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5
  6. National Center for Complementary and Integrative Health. Rhodiola. 2025Evidence boundary: An official review of rhodiola use and evidence in people.↩ 1 · ↩ 2
  7. Sherry Lynn Sanderson. Nutritional Requirements of Small Animals. 2024Evidence boundary: Veterinary nutrition guidance on species requirements, food energy and vitamins.↩ 1 · ↩ 2
  8. Reactome. Detoxification of Reactive Oxygen Species. 2013· DOI 10.3180/REACT_172715.1Evidence boundary: A curated pathway describing reactive oxygen species and antioxidant defenses.↩ 1 · ↩ 2
  9. Xiao W, Wang RS, Handy DE, Loscalzo J. NAD(H) and NADP(H) Redox Couples and Cellular Energy Metabolism. 2018· DOI 10.1089/ars.2017.7216Evidence boundary: A review of NAD(H) and NADP(H) in cellular metabolism.↩ 1 · ↩ 2
  10. Rachel S Fletcher, Joanna Ratajczak, Craig L Doig, Lucy A Oakey, Rebecca Callingham, Gabriella Da Silva Xavier, Antje Garten, Yasir S Elhassan, Philip Redpath, Marie E Migaud, Andrew Philp, Charles Brenner, Carles Canto, Gareth G Lavery. Nicotinamide riboside kinases display redundancy in mediating nicotinamide mononucleotide and nicotinamide riboside metabolism in skeletal muscle cells. 2017· DOI 10.1016/j.molmet.2017.05.011Evidence boundary: Experimental research on NR metabolism through NMN into NAD+.↩
  11. Reactome. Complex I oxidises NADH to NAD+, reduces CoQ to CoQH2. 2005Evidence boundary: A curated mitochondrial reaction describing electron transfer to coenzyme Q.↩
  12. NIH Office of Dietary Supplements. Riboflavin: Fact Sheet for Health Professionals. 2022Evidence boundary: A scientific fact sheet on riboflavin-derived cofactors.↩
  13. La Petite Labs. Hollywood Elixir®: current ingredient declaration. n.d.Evidence boundary: The manufacturer’s 17-active declaration and full-sachet amounts.↩ 1 · ↩ 2 · ↩ 3 · ↩ 4 · ↩ 5 · ↩ 6 · ↩ 7 · ↩ 8 · ↩ 9 · ↩ 10 · ↩ 11
  14. La Petite Labs. Hollywood Elixir® Longevity System: serving and purchase options. n.d.Evidence boundary: Manufacturer directions for adult daily portions and product use.↩ 1 · ↩ 2
  15. La Petite Labs. Publicly verified lab results and COA Lookup. n.d.Evidence boundary: The manufacturer’s public route to batch-linked quality reports.↩

FAQ

What are adaptogens for cats, in plain everyday terms?

The term usually covers herbs or fungi chosen with the intention of helping the body handle stress. Reishi is a fungus in that category. The name does not establish a common effect for every preparation or prove that it calms cats. 5

Which cats should avoid an adaptogens supplement for cats?

A mushroom allergy is a reason to avoid medicinal mushrooms. Pregnancy, nursing, bleeding disorders and liver, kidney or immune-mediated disease need individual veterinary review. 3

What side effects can adaptogens cause in cats?

Digestive upset or allergic reactions can occur with mushroom products. Stop a new supplement and contact the veterinary team if concerning symptoms develop. 3

How do I choose the best adaptogens for cats health?

Match the complete preparation to your goal. Check its mushroom form, named compounds, daily portion and other ingredients. Hollywood Elixir combines reishi with 16 other actives for cellular energy, antioxidant support and healthy aging; its purpose is broader than a single mushroom. 13

How quickly should I expect results from adaptogens for cats?

There is no established universal timeline for a calmer cat. The feline study discussed here measured a specific blend’s gut and blood outcomes. A new behavior or appetite change needs its own assessment, rather than waiting for a promised supplement week. 2 4

Can senior cats benefit more from adaptogens supplements for cats?

Age alone does not establish a reishi need or predict a larger benefit. Choose according to the cat’s health, accepted food and nutritional goal. Hollywood Elixir is intended for adult and senior pets and brings reishi into a broader 17-active healthy-aging formula. 13 14

How does reishi compare to rhodiola for cats?

Reishi is a fungus and rhodiola is a plant, with different preparations and research. The human rhodiola literature does not provide a feline head-to-head comparison. They should not be ranked or substituted solely because both are called adaptogens. 5 6

When should I call the vet before using adaptogens for cats?

Ask first when chronic disease or prescription medicines are involved. New aggression, hiding, appetite loss or other concerning changes also need assessment on their own terms. Bring the label and intended portion. 3 4

Orange-and-white cat beside a Hollywood Elixir box held in a person's hand

Discover LPL-01: How This Fits Into a Larger Feline Longevity System

Aging in cats unfolds quietly. It’s not driven by a single failure, but by gradual shifts across interconnected systems — cellular energy, oxidative balance, immune tone, and tissue integrity — each influencing the others over time.

This article explores one layer of that system. To understand what actually shapes long-term health, you need to step back and look at how these layers interact.

Start with the underlying science:

Keep exploring

What would you like to understand next?

Search practical guides about healthy aging, cellular energy, ingredients, and daily support for cats.