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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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  • 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 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
Rated 5 out of 5 by from THE BEST Excellent product. My mare I got more a rescue came to me much more underweight than I expected. No topline, no muscle anywhere. Now she is gaining topline, she has had a growth spurt and her haunch muscles are amazing! People constantly comment on her butt! Huge difference in 4 months. Slight difference in 2-3 months. But give it at least 3 months!
Date published: 2020-05-04
Rated 5 out of 5 by from Saw Positive Changes in 6 Weeks I put my 18yo TB gelding on this about six weeks ago. His top line was not coming back like it used to after being off due to an injury for three months. I had already added alfalfa cubes into his diet and was looking for additional support. With the quarantine, I have not been at the barn regularly and he has not been working regularly, but it's clear the difference this supplement has made in his body condition! His hindquarters and shoulders are less angular and there's better fat cover across his body. I can't wait to start working him again to see the full effects.
Date published: 2020-04-22
Rated 4 out of 5 by from Really helped add weight and muscle! I started my horse on this about a month ago and it’s really helped her gain muscle and weight! I was struggling to have her put weight on, but we’re finally seeing results after starting her on this!
Date published: 2020-04-03
Rated 2 out of 5 by from Nothing I was hoping this would help my pleasure gelding build up his butt/ However after 2 months I do not see any improvement. He had no problems eating it. Just did not do anything.
Date published: 2020-03-15
Rated 4 out of 5 by from Quick results I bought this two months ago and I am very pleased with the results. I am already seeing a difference in my boy and his body type.
Date published: 2020-03-05
Rated 3 out of 5 by from Slight improvement I’ve only been using for a little over a month and have seen a slight improvement, but I haven’t been able to exorcise my gelding because of all the mud and ice
Date published: 2020-02-07
Rated 5 out of 5 by from Bought more Thought I'd try the SmartMuscle Mass Pellets to help support my horse's topline, which needed work. Of course that's a gradual process, but I actually started noticing a difference within a couple weeks of starting him on these. It's hard to say how much of the change is attributable to the supplement versus training/exercise, but I'm confident enough that this supplement is helping that I bought more. Probably won't keep my guy on them forever, but for now I feel it's money well spent. Also, he gobbles them right down (though he's not a picky eater).
Date published: 2020-01-20
Rated 5 out of 5 by from It’s working! I am on my 2nd month of this product and my TWH that I got from a kill pen is putting on weight and looking more muscular. Can’t wait to see how he looks this spring after he sheds out. He eats it without batting an eye.
Date published: 2020-01-15
Rated 5 out of 5 by from Awesome!! I used this supplement from June to August and saying my horse transformed is no understatement. When I bought him he needed a lot of topline and rounding out. After this I got complements from everyone in the barn and on the trail about how great he looked. I'm really happy with what this product did to my horse. The first picture is when I started it in June, and the second is in August.
Date published: 2020-01-07
Rated 4 out of 5 by from Good Product! I have my 18 yr old TB mare on this for the winter along w\ her ProForce Fuel grain and her topline is amazing! Her shoulders have gained alot of muscle and she does not look 18 years old. This is a good product for those horse trying to build muscle who are older!
Date published: 2019-12-24
Rated 5 out of 5 by from Just what she needed Hi, I chose the smart muscle because I personally loose flab with a good protein diet while controlling carbs. I thought my somewhat chunky QH mare would do likewise. And yes, her weight isn’t changed, but her crest is reduced and her shoulders are loosing flab and gaining muscle. Her top line is improving, pulling up that belly. Years of exercising while on carb restriction and 30% balancer did not give me that result. She would loose weight and crest, but not get a top line, she sagged in the belly, and was anxious. The combination of quiescence and smart muscle gave me a less cresty less spooky mare with nicely developing muscles. Poor girl was an athlete without enough fuel to build the muscles her genetics called for! Thanks so much for your wonderful products.
Date published: 2019-09-25
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