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Lean Muscle or Strength & Stamina: Topline or Go-the-Distance?
Lean Muscle leads on colostrum for topline; Strength & Stamina adds Cordyceps and King Trumpet for hooves, coat and stamina. Which ImmuBiome formula fits?
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Both of these sit in our Muscle Building collection, and both lean on colostrum. Lean Muscle is about filling out: topline, condition and muscle tone. Strength & Stamina is about work capacity, with hooves, coat and connective tissue in the mix.
Side by side
| What | Lean Muscle | Strength & Stamina |
|---|---|---|
| Built for | Topline, lean muscle, everyday condition | Stamina, hooves, coat, connective tissue |
| Mushrooms | Reishi | Cordyceps sinensis, Cordyceps militaris, King Trumpet, Lion’s Mane |
| Colostrum | 8,750 mg | 3,000 mg |
| Probiotics | 3 billion CFU | 3 billion CFU |
| Prebiotics | 750 mg | 6,500 mg |
| Beta-glucans | 10% minimum | 25% minimum |
| Smallest tub | 420 g, from $134 | 300 g, from $69 |
Choose Lean Muscle for topline
If your horse has lost topline over winter, is coming back from time off, is a senior who struggles to hold condition, or is a youngster still filling out, Lean Muscle is the one. It’s built around colostrum, carrying more than any other formula we make, and has no molasses or added sweetener, which suits easy keepers. It pairs with G-Tract in our ulcer protocol.
Choose Strength & Stamina for work capacity
For the eventer, endurance horse or busy show horse who needs to keep going, with hooves and coat you want to look after too, Strength & Stamina is the better fit. Two Cordyceps species support stamina, and King Trumpet supports bone and connective tissue. It also leads our Hoof Support collection.
What about both?
Some owners use both for a hard-working horse who also needs topline. Ask us at 1-888-31-HORSE or check with your vet before combining. Our PSSM post is worth reading if muscle is a long-running concern; that’s a conversation for your vet first. Both formulas are in Muscle Building Support.
Still deciding? Try the Formula Finder or see every tub size on Compare Formulas.
Questions owners ask
Which builds more topline, Lean Muscle or Strength & Stamina?
Lean Muscle is our topline formula, with 8,750 mg of bovine colostrum and Reishi. Strength & Stamina supports muscle capacity too, but its focus is stamina, hooves, coat and connective tissue.
Why does Lean Muscle cost more?
Its smallest tub is 420 g rather than 300 g, and it carries far more colostrum than any other ImmuBiome formula. Both formulas are on the Compare Formulas page with every tub size.
Can a hard keeper have both?
Some owners use both for a horse who works hard and struggles to hold condition. Give us a call or ask your vet so the plan makes sense as a whole.
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Shop Lean Muscle and Strength & Stamina
Every formula ships free on subscription, and you can return any tub within 30 days, even opened.
Strength & Stamina
4.96 (358)
From $69
Cordyceps, King Trumpet and 3,000 mg of colostrum for stamina, hooves and coat.
These statements are about nutritional support only. ImmuBiome supplements are not drugs and don't take the place of veterinary care. Talk with your veterinarian about your horse's specific needs.

