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SmartMuscle® Mass Pellets

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Daily Serving

Dog Weight - lbs Inactive Dog Active Dog Working Dog
Inactive Dog - Less than 30 minutes of vigorous exercise daily
Active Dog - At least 30 minutes of vigorous exercise daily
Working Dog - More than two hours of vigorous exercise daily
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Product Overview

Which horses benefit from muscle building support?

Every horse owner wants their partner to have strong, healthy muscles to power performance; whether that means jumping the course, winning the halter class, or hitting the trail. Supplements in this category provide the building blocks needed for lean muscle development and are a great way to ensure your horse your horse has the right nutritional support to make the most of his exercise program.

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Supplement Facts

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Ingredient Details


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How the Ingredients Work


Supporting Success

Supercharge Your Supplements

  • Christine McCrea and Tim McQuay on SmartMuscle Mass Equine Supplement
    Team SmartPak Riders, Christine McCrea and Tim McQuay, talk about why they trust the health of their top horses to SmartMuscle Mass ( Want your horse to be powered by SmartSupplements, too? Order today at
  • Simplify with SmartPaks | Consistent, Custom, Convenient
    Simplify your life with SmartPaks: custom-made, pre-measured daily doses of your horse's supplements.


The reviews provided on this website represent the experience of the individual posting the review. We do not adopt, edit, or endorse any of the submissions posted within the reviews section. Rather, the reviews are part of an online community of animal owners that desire to share their particular experience with other individuals. These reviews are not a substitute for discussing the health of your animal with a veterinarian.

SmartPak customers are some of the most conscientious animal owners around. We encourage you to share your experience with the products we sell to help fellow customers to make informed choices for their animals. We do not edit these reviews in any way - they are direct customer-to-customer communication. We do monitor reviews for positive and negative feedback, and use this feedback to improve our selection as well as sharing feedback with product manufacturers to help them improve their products. Please note that we recommend consulting your vet with serious health issues.

SmartMuscle® Mass Pellets is rated 4.5 out of 5 by 367.
Rated 5 out of 5 by from I swear by this stuff I have used this supplement on two different thoroughbreds with amazing results each. It fills in top line, hindquarters, and all the necessary areas quickly. Noticeable difference before one month was up. Helps overall appearance, shine, and weight gain as well. This product works, very happy with it.
Date published: 2023-01-10
Rated 5 out of 5 by from Has made a difference! My horse recently lost a lot of topline and I’ve been giving her this for about a month and a half. I have noticed a difference in it not being so bony and it’s starting to fill out again.
Date published: 2022-12-13
Rated 5 out of 5 by from Superior muscle builder I used this over a period that my horse wasn't in work, as I didn't want him to lose too much muscle and was super happy with the results after a few months of feeding this. I switched to a lower cost (Leg Up) supplement, and have noticed a decrease in his condition. Its expensive, but it works! Switching back to this for the foreseeable future.
Date published: 2022-12-06
Rated 5 out of 5 by from Everyone Sees the Difference I bought this product because I saw it being used on another horse in my barn and he was nice and muscular. I started feeding it in May while I was home over the summer. At first, I wasn't sure if the supplement wasn't making a difference, or I just didn't see the change it made because I saw my horse every day. When I moved back to school in August everyone said that my horse looked great, like he'd really filled out and grown up over the summer. Just yesterday I sent a photo of him to someone who hadn't seen him since May and they said they didn't even recognize him at first because he has so much more muscle. Unfortunately, I don't have a before photo for comparison, but I think its safe to say that the supplement helped him gain muscle over the past few months.
Date published: 2022-11-02
Rated 5 out of 5 by from Good top line builder! I was back and forth on what supplement I wanted to use in my horse. I was torn between a senior one or the smartmuscle and I just decided to go for this one. After a week, I saw a difference, but taking a step back to see the month difference is mind blowing! I’m so incredibly happy with this product and would recommend it to anyone hoping to improve that top line.
Date published: 2022-10-29
Rated 2 out of 5 by from Palatability Unfortunately my mare became incredibly wary of her food after giving musclemass pellets. Tried wetting food, putting a single pellet in, using molasses. Took two weeks of plain hay pellets just to get her to trust her food again. To be fair, it does smell like a protein shake. Seems like it would be great for horses that it will eat it. It was an expensive gamble.
Date published: 2022-07-07
Rated 5 out of 5 by from Huge improvement I was given a Hackney pony and over the winter he started developing a very locked stifle and could barely walk. We started on a very strict routine of ground pole work and walking up hills. I also read to start on a muscle building supplement and after talking to Smart Pak chose Smart Muscle Mass. It has only been a month and a half and I have seen a huge improvement...he is firing off all cylinders like the crazy little Hackney he was when I first started working him. The only change besides the "horse physical therapy" was this supplement, and you'd never know he had stifle issues. And his muscling looks amazing despite only doing walking and stretching. Going to try this on another lesson horse I have and see if it helps him as well.
Date published: 2022-03-12
Rated 4 out of 5 by from Great Results, a little pricey for regular use I bought this to try because my mare lost a lot of muscle tone after surgery and once she could start working again, I wanted to help her regain the lost muscle quickly. It did work, I started seeing results in about 2 weeks. I was making sure I exercise her 5-6 times a week (1 day light work, 1 day off) along with a balanced diet and this muscle mass supplement from Smartpak. I just don't think it is reasonable to pay $40 a month for what is essentially amino acids, when I'm already paying for other supplements for her that have better value for her health. I don't have a 'before' picture, but I've added a picture I took after a few weeks of using this and she definitely did not have the forearm and shoulder muscle like in the picture. She had also been off work from July to November. As for palatability, I think it is best to mix with other grain. I am not sure my horse noticed the taste because I was mixing it in with her ration balancer and flax that she loves. But I have since given to a couple other horses at the barn by itself and they didn't care for the taste.
Date published: 2021-12-17
Rated 5 out of 5 by from Fast results for topline and filling out hind qtrs Purchased this product for our 23 yr old qtr type mare, she isnt used very often and came out of MN winter with little to no muscle tone, especially being older she was becoming older horse syndrome of possible cushings with larger belly and low top line. She is and was wormed regularly so worms were not the problem with riding her litely once a week in the summer for 1/2 hr and proper feed and SMARTPAK muscle mass she really filled out nicely. I use SMARTPAK OFTEN on my other horse for her joints I do feel the supplements are indeed beneficial. However a bit spending, but adds tremendous results on most of the products I have used including the Muscle Mass for our mare we dont hardly ride regularly.
Date published: 2021-11-10
Rated 5 out of 5 by from Really Helps the Muscles! I have a 12-year-old miniature gelding I was given a year ago. When he came to me I adjusted his nutrition and feed program to help him put on weight and muscle. In a month I started seeing the difference SmartMuscle Mass was making. In eight months this pony went from no topline and a bloated belly, to looking like a horse ready for a halter class with a beautiful topline. I just recently added this to my 24-year-old mare’s Smartpaks and in 30 days definitely see it giving her topline muscles the nutritional support they needed. For forage both horses are on coastal-grass pasture during the day (with grazing muzzles) and fed alfalfa and alfalfa/orchard grass hay in slow-feed nets when in their sheltered paddock at night. My horses only receive their forage and Smartpak supplements. They are not fed any other type of grain, oats, or bran products.
Date published: 2021-10-24
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