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SmartMuscle® Mass Pellets

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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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Key Ingredients


Supplement Facts

Ingredient Name Amount Per Serving
Ingredient Name Amount Per Pound

Ingredient Details


Weight Recommended Amount Loading Amount

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 378.
Rated 5 out of 5 by from Helped my OTTB build a great top line! My OTTB has been on this for about 6 months now after needing to go on a pretty strict diet due to allergies and no longer being able to have most grains. In combination with ration balancer and a few other supplements, he has the best top line and overall muscle definition that he's ever had despite being in the same amount of work.
Date published: 2023-04-17
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
Rated 5 out of 5 by from Amazing Topline Results I had my pony, Pumpkin, leased out for a few months. Unfortunately, when he came back he was lacking muscle. He had lost a lot of muscle on his topline and hind end. I wasn't sure if it was from a lack of vitamins and minerals or because he is now getting some age on him. I was very concerned. I didn't want to feed him more feed and have him gain weight and form laminitis. He has always been an easy keeper. So easy that when he was previously home, he wore a grazing muzzle. I figured the best thing to do is support his muscle development. My vet recommended that I use a supplement with amino acids and Gamma Oryzanol. SmartMuscle® Mass Pellets fit the bill. I try to be cautious about loading my small pony up on supplements that he doesn't need. Since he has been on SmartMuscle® Mass Pellets, 3 months now, he looks dramatically better. I definitely recommend this as something simple to add to a horse's diet. What a difference a few months make! I will continue to use this product and would recommend it. It is a great product for putting muscle weight on some horses. Pumpkin benefited from SmartMuscle Mass, his chest is more muscular as are his hind quarters, topline, and neck. It's an amazing product!
Date published: 2021-10-13
Rated 5 out of 5 by from Incredible product for building topline I put my horse on this every year, around the time when summer transitions to fall. My horse is older and suffers from a mild case of shivers, which makes it difficult to put muscle back on him when he leans out, as the grass dies out in the fall every year in New England. This product gives him the exact boost he needs to get through, and really helped him out this year, when he got very lean quickly. Just over a month later and you can see the results. His coat is shiny, he has plenty of energy, and his muscling looks great again. Definitely a go-to of mine every year.
Date published: 2021-09-12
Rated 1 out of 5 by from No difference My gelding is on his second month of this supplement and I've not noticed a difference in his muscling/weight unfortunately. He's in 5 day a week work and I wanted to help him with muscle gain as he's a long bodied guy, plus no hills in NC. He eats it with no issue at least. Will not continue after this month is used up!
Date published: 2021-08-25
Rated 5 out of 5 by from Working already! I have been tweaking my OTTBs diet since I got him about 18 mos ago and he’s been slowly putting in condition and muscle. But a vet friend mentioned that she liked this supplement so I started him on it about 7wks ago. It seems like he’s already filling out even more very quickly! It’s the only thing I’ve changed recently and he’s actually getting a little less work lately, if anything, due to the very hot summer weather lately. So far I’m pretty impressed!
Date published: 2021-08-16
Rated 5 out of 5 by from Seeing results after 3 weeks! I was having some trouble building a top line on my ottb so I decided to add this to his supplements . I sure am happy I did. He is less sore overall after workouts and really showing improvement In His top line! can’t wait to see him in six months !
Date published: 2021-07-09
Rated 4 out of 5 by from Great product. Bought this a month ago and love it. I’ve seen some muscle gain on my horse and she is looking fabulous. Loved they they give you a tote for storage for it. I like the concept of having thing pre-measured, don’t care for the way it’s packaged with plastic, ends up with a lot of plastic waste. Overall it’s been a good product.
Date published: 2021-06-11
Rated 5 out of 5 by from I Bought this product to rebuild my horse's muscle mass. He had contracted a viral infection when I went to Arizona to rope. I nearly lost him but he recovered and had significant weight loss. Muscle mass is returning. I plan to continue using this product for a while.
Date published: 2021-05-27
Rated 5 out of 5 by from Really works fast We are 60 days into using SmartMuscle Mass Pellets in addition to the SmartCombo Ultra pellets (which he has been on about 6 months). The photo on the top was immediately prior to starting any Smartpak supplements. This horse was adopted as a retired TB racehorse at age 7. He lost a lot of weight and muscle quickly during initial transition into his new lifestyle. When I added the Smart muscle to his supplement plan 2 months ago, he started gaining muscle right away! His overall soreness is improved and his weight gain has been amazing. He is still only about 70% where I want him, but oh em gee he is looking pretty handsome already!
Date published: 2021-04-07
Rated 5 out of 5 by from Worth every penny I started my thoroughbred filly on this after we got her fresh off the track since she was a 3 year old that was still physically immature and still growing. The difference this product has made for her since starting it (about 60 days) has been wonderful and the progress is way better than I had expected. This is with no work, just let down time and turned out in the pasture. It's also helped with keeping weight on during the winter since she's one of those that hates cold weather and struggles with maintaining weight during the cold months. I'm excited to see the difference it makes when I get her back into a consistent program!
Date published: 2021-03-22
Rated 5 out of 5 by from Great! I’ve had my horse on this for 2 months now. Progress is slow, but I see improvement. Excited to see how it continues to affect him.
Date published: 2021-03-15
Rated 5 out of 5 by from Amazing results in 30 days ! I am blown away at the results, even my hard to impress husband can tell the difference! In 30 days my 4 year old quarter horse has put on 15 pounds! He looks more defined and recovers quickly from workouts. We show in reined cow horse and sometimes training takes a lot out of him but with this supplement he recovers faster.
Date published: 2020-11-20
Rated 5 out of 5 by from Excellent Results This product was recommended by a horse nutritionist for my 13 year old gelding. He had 3/4 of his colon removed and recovery was good but slow. This gave him support in absorbing nutrition. He looks wonderful with development on his top line and hindquarters.
Date published: 2020-11-05
Rated 5 out of 5 by from Great Product! I love using this on my horses in training. It really allows them to grow muscle where they need it the most. For many years my horse struggled to fill out in his neck and topline and as you can see after using this product as well as proper conditioning he looks amazing!
Date published: 2020-09-25
Rated 5 out of 5 by from Great product I bought this for a horse that I taken in who was really skinny and needed weight and muscle. This product sure did help him alot as the other ones I have him on as well will order again.
Date published: 2020-09-03
Rated 1 out of 5 by from Not impressed I've had my mare on this for 2 months and there's not much difference in her topline. Not worth the price.
Date published: 2020-08-06
Rated 5 out of 5 by from Great Results! My girl has been on this for a little over a month and I have seen nothing but great results! Paired with a workout routine, my barrel horse was able to put the weight and muscle on that she needed. Both friends and family are in ‘awe’ whenever they see her now! And, of course, she has absolutely no complaints about it!
Date published: 2020-08-04
Rated 5 out of 5 by from Great Results - OTTB My trainer recommended this supplement when we brought in our 4yo OTTB. He came in well loved and cared for, but definitely thin from the track. The photos below were taken 12 weeks apart. He gets his fair share of hay and has been lunging in a Pessoa system for 10 of those weeks. I feel the supplement is contributing to helping him gain weight and develop muscles well.
Date published: 2020-07-21
Rated 5 out of 5 by from It just works! I moved from GA to CA and my horse who was used to grazing all day and moving went into a 12x24 with no grass. I quickly noticed his topline starting to fall. I started him on this and the results were fast and gave the right muscle where he needed it! It has been a life saver out here!
Date published: 2020-06-11
Rated 5 out of 5 by from Great product This is my second month of using this product and can see a huge change in my gelding
Date published: 2020-05-20
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