Myco Pet Lean Mass+ jar, 60 servings, on a white backgroundPart 2 of the Itchy Pet Protocol
Leaky GutRecoveryStrength & Weight

Lean Mass+

Targeted support for lean muscle maintenance, tissue repair, and recovery. Helps strengthen resilience while supporting gut health and whole-body vitality.

5.0 · 5 reviews
$54.99
  • Supports Leaky Gut Syndrome
  • Helps improve recovery after injury
  • Supports gut health and nutrient absorption
  • Designed for active, underweight, or recovering pets
Choose your size
How do you want it?
1
Not sure it’s the right one? Ask Mikvah, our product guidePairs perfectly with the Itchy Pet ProtocolFrom $129.97. Save time with the complete routine. See it
Human-gradeMade in CanadaNo fillersDogs & cats
Made for pets with

Sound like your pet?

Colostrum, mushrooms and probiotics support the gut lining, muscle and recovery.

Leaky gut & poor absorption
Leaky gut & poor absorption
Injury, surgery & recovery
Injury, surgery & recovery
Healthy weight gain or loss
Healthy weight gain or loss
Joint health
Joint health
Active & working dogs
Active & working dogs
Senior muscle loss
Senior muscle loss
What Lean Mass+ is made for: leaky gut, injury repair and recovery, healthy weight gain or loss, joint health, active and senior pets, lean muscle and strength
What it does

Benefits you can see

70–80% of a pet’s immune system lives in the gut. Rebalance it, and the skin, coat and tummy follow.

  • Supports muscle, bone, ligament, tendon, and cartilage health
  • Supports normal immune function and cellular growth and repair
  • Supports intestinal health, normal digestion and nutrient absorption
What’s inside

Every scoop, explained

Exactly as on the label. Tap any ingredient to learn what it does.

ReishiSupports calm, resilience, and immune health

Reishi is traditionally known as the “mushroom of longevity.” It helps support immune balance, stress resilience, and overall vitality, making it a powerful daily wellness ingredient.

ProbioticsHelps maintain beneficial gut bacteria

Probiotics are beneficial microorganisms that help support digestive balance, stool quality, and a healthy gut environment. They are an important part of daily microbiome support.

18 species of probiotics because DIVERSITY is the best indicator for positive outcomes, not CFU count.

B. lactis, B. bifidum, B. breve, B. infantis, B. longum, E. lactis, L. casei, L. acidophilus, L. bulgaricus, L. plantarum, L. rhamnosus, L. salivarius, Lc. lactis, L. brevis, L. fermentum, L. reuteri, S. boulardii, and S. thermophilus

PrebioticsNourishes the gut microbiome

Prebiotics act as food for beneficial gut bacteria. They help support microbiome diversity, digestive comfort, and the foundation for stronger gut and immune health.

Digestive Enzymes (Postbiotics)Supports gut and immune signaling

Postbiotics are beneficial compounds produced by probiotics. They help support gut barrier function, immune communication, and overall digestive resilience.

ColostrumSupports gut lining, immune development and tissue repair

Colostrum provides naturally occurring immune-supportive compounds that help support gut lining integrity, immune health, and whole-body resilience, especially during growth, stress, or recovery. It also contains growth factors to support tissue growth, regeneration and repair.

*Ethically sourced – baby cows get all they need before we collect any colostrum!

Beta-GlucansSupports immune resilience

Beta-glucans are naturally occurring compounds found in functional mushrooms and yeast. They help support healthy immune activity, gut health, and the body’s natural resilience.

FenugreekSupports digestion and metabolic balance

Fenugreek is a traditional botanical known for supporting digestive comfort, healthy metabolism, and overall vitality. It also helps support nutrient absorption and balanced wellness from within.

18probiotic species
Colostrumrich formula
0fillers or sweeteners
0.5 gper serving
How to use

One scoop, once or twice a day

Mix into damp food. Most pets do great on once a day. When things flare up, simply give it more often: it’s very unlikely you can give too much, but you can give too little.

1× a dayEveryday maintenance
2× a dayFlare-ups, allergy season, stress, travel or after antibiotics
Up to 3× a dayTough cases and periods of high external stress

Store in a cool, dry area, away from direct sunlight.

How much for my pet? 1. Weight
2. How often
Each serving1 scoop1× a day
Small jar lasts60 days
Large jar lasts200 days
1 scoop = 0.5 g. Sensitive pets: start small and build up over 7 days.
Reviews
5.0out of 5
Based on 5 reviews Read all reviews
“The colostrum in this mix helps a lot to rebuild muscle ect, so this particular product has been extra awesome for my bulldog. Helping him grow into a beautiful pup!”
Kayla · Verified buyer
Join thousands of happier pets.Most pet parents notice a difference within 2–30 days of daily use.

Customer Reviews

Based on 5 reviews
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M
Marie-Claire Mcmullin
Our dog Cooper

Our dog, Cooper has been taking ½ scoop each of Gut & Immunity and Lean Mass twice a day for the past 13 days and has been completely off all other medications. I am still in disbelief at his transformation. His skin is completely clear, and he has stopped itching altogether.

I cannot express how grateful I am to you and your products. The results have been nothing short of amazing.

Thank you so very much.
Marie-Claire McMullin

S
Stéphanie Bossé
Perfect

Perfect product

C
Chloe Hewett

Highly recommend this product!
Smells great (reminds me of maple walnut ice cream at my grandparents) the dogs enjoy the taste. It’s a smooth powder so no chalky texture to worry about when adding to their meal.

Our vet had made positive comment on weight improvement and muscle for both our girls during their annual visits after starting them on this product. It’s nice to know something natural is available to utilize for such clear results!

T
Teresa Sota

This an amazing product! We have been giving it to our standard poodle who has colitis and she now her flareups are a rare occurrence. I highly recommend Lean Mass for any pooch parent who has a fur baby with inflammatory gut issues.

Teresa Sota review photo
K
Kayla

The colostrum in this mix helps a lot to rebuild muscle ect, so this particular product has been extra awesome for my bulldog. Helping him grow into a beautiful pup!

Better together

Itchy Pet Protocol

Itchy Pet Protocol is Myco Pet’s most complete support bundle for dogs and cats with itchy Skin and Coat, paw licking, yeasty-smelling skin, hot spots, skin irritation, bad breath, poor digestion, and gut imbalance.…

Learn more
Itchy Pet Protocol for Dogs & Cats — Advanced Gut, Skin and Coat, Paw & Hot Spot Support Bundle
FAQ

Questions, answered

Still unsure? Ask Mikvah, or reach out. We’re always an email or call away.

How long does it take to see results?

Every pet is different, but many pet parents notice improvements within 2-30 days of consistent daily use. For deeper gut healing, immune balance, and long-term wellness support, we recommend giving the products at least 60–90 days.

Can I use this with my pet’s current food or medication?

In most cases, yes. Myco Pet supplements are designed to work alongside your pet’s existing routine and can be mixed directly with food. We have not found any contraindications with medications. If your pet has a medical condition, we always recommend speaking with your veterinarian first.

Is this safe for both dogs and cats?

Yes. All our products are formulated for both dogs and cats. Dosage is adjusted based on your pet’s weight and needs.

How do I serve the supplement?

Simply mix the recommended amount into your pet’s food 1-2x daily. For sensitive pets, you can start with a smaller amount and gradually increase to the full serving over several days.

What if my pet is a picky eater?

Many pets adjust easily when introduced slowly. Start with a smaller amount mixed into wet food, raw food, broth, or a favorite topper to help with acceptance.

Know that if they're a picky eater, this often is a sign that they have an imbalance in their gut microbiome. Try the Gut & Immunity+ supplement to help with this.

Also, our serving size is soooo tiny because we don't add any fillers, artificial ingredients or preservatives, so palatability is almost never an issue.

Can puppies and kittens use this?

Yes, but we recommend using age-appropriate formulas like our Puppy & Kitten Formula when possible. Always follow serving guidelines based on age and size.

Do I need to use this every day?

Consistency is key for the best results. Functional mushrooms, probiotics, prebiotics, and postbiotics work best when used daily to support long-term balance and resilience.

We always ask: if you feed your pet every day, they should also get gut supporting toppers to counteract the negative effects of the many toxins in our food system these days.

Is this a probiotic?

All our supplements include 18 different species of probiotics, but it goes beyond that. Our formulas combine probiotics, prebiotics, postbiotics, functional mushrooms, colostrum and targeted nutrients to support the gut-immune axis and root-cause wellness.

What makes Myco Pet different from other pet supplements?

We focus on root-cause wellness, not symptom masking. Our formulas combine functional mushrooms, probiotics, microbiome support, and human-grade ingredients designed to restore balance, strengthen immunity, and support whole-body vitality.

Can I use multiple Myco Pet products together?

Yes. Many pet parents combine products depending on their pet’s needs. For example, Gut & Immunity+ pairs well with Lean Mass+ and the PROTECT Spray for both internal and external support.

Can I give my pet too much?

Thankfully, we have no evidence that suggests your pet can overdose on this. In fact, some pets are using 4,6 and 10 doses per day with no negative side effects!

We like to say, it's very unlikely you can give too much, but you CAN give too little! So if you're not seeing the results you want, your pet likely just needs a little bit more.