Has added muscle much faster than any other product.

Jill

Verified buyer

MuscleMx Pellets

$38.00

CERTIFIED BY THE

Title
Formula 707 MuscleMx combines four natural nutrients that work synergistically to encourage the metabolic reactions required for muscle growth and development. Lysine lays the foundation for the formation of muscle-building proteins

Congrats! You've reached the threshold for free shipping!

Title
Size
Quantity
Title
Title

Free Shipping On Orders $100+

90-Day Satisfaction Guarantee

Formulated With Veterinarians

Made In Colorado

Description:

Formula 707 MuscleMx combines four natural nutrients that work synergistically to encourage the metabolic reactions required for muscle growth and development. Lysine lays the foundation for the formation of muscle-building proteins. Gamma oryzanol, a natural plant extract, assists in weight gain and muscle formation. Creatine, a naturally-occurring organic acid, helps supply energy to muscle cells by stepping up production of ATP, the body’s energy-transport molecule. And Ornithine-A-Ketoglutarate (OKG), an organic salt based on the amino acids ornithine and glutamine, bypasses the inhibitory metabolic processes preventing new muscle development. MuscleMx provides real, natural results.

Return Policy:

We offer a 90-day 100% satisfaction guarantee on all of our products. This satisfaction guarantee extends to products purchased on our website directly. Products that are purchased from other sellers (e.g. Amazon, Chewy, brick & mortar) are subject to the return policies of their respective seller. Unopened products may be exchanged or returned (for order credit or full refund). Customer is responsible for return shipping. We allow exchanges and returns on open products at our discretion. The guarantee is also limited to your most recent purchase of a specific product (e.g. if you've been using a product for 5 months with a purchase every month, we will only refund your most recent purchase, even if purchase #3 and #4 are within the 90 days).

For more information on returning an item, please contact our customer service department at 800-525-8601. Thank you.

We ship within 2 business days of receiving an order, usually the next business day.

In the event of a return, please notify us that you are returning the product. We will always accept new, un-opened products within 90 days of the purchase date. Returning a product with no notification will result in no refund. For open or used product, we have a 90-day satisfaction guarantee. Please reach out to us and we will make things right!

Once initiating the return, please send the product to us within 30 days. Once the return is received, you can expect the funds to be received back on your credit card within a week. Customer is responsible for return shipping.

Has added muscle much faster than any other product.

Jill

Verified buyer

  • Directions for Use

  • Ingredients

Under 500 lbs -  Provide ½ scoop daily
500 – 1000 lbs. – Provide 1 scoop daily
1000 lbs. or over – Provide 1 ½ scoop daily
Or, as directed by your veterinarian. 
 

Ingredients Table
Active Ingredients per Scoop (1.5 oz.)
Lysine 5000 mg.
Proprietary Blend - (Gamma Oryzanol, Creatine Monohydrate, Ornithine-a-ketoglutarate) 1100 mg.
Inactive Ingredients:
Alfalfa, Wheat Midds

Fuel your horse's muscle development from within

Building and maintaining muscle can be frustrating, especially when a horse is in work but still struggles to develop topline or maintain condition. This comprehensive muscle formula was created to support horses facing those challenges. With a high level of lysine and a carefully selected blend of muscle-support ingredients, it is designed to support topline, strength, and overall muscle condition in horses in regular training.

 

The before and after shown here features a 6-year-old horse after one month on Pro Edge and MuscleMx. Supplied by Colts Unlimited in Wyoming, the photo reflects the type of muscle development and condition support that targeted nutrition and consistent work can help achieve over time.

Buy MuscleMx

Photos courtesy of Colts Unlimited of Sheridan , WY

Lysine

Supports muscle development and topline by supplying the essential amino acid horses rely on to build and maintain muscle. Especially important for horses in regular work or training programs.

Gamma Oryzanol

Supports muscle tone and overall conditioning in performance horses. Commonly used in muscle formulas to help support horses through consistent training.

Creatine

Supports muscle energy pathways involved in physical work and conditioning. Included as part of a comprehensive muscle-support formula for horses in training.

OKG (Ornithine Alpha-Ketoglutarate)

Supports amino acid utilization and muscle recovery during periods of increased workload. Helps support muscle maintenance as part of a balanced conditioning program.

Addressing muscle soreness after training

After a ride, some horses feel tight, stiff, or slow to loosen up, and those small signs can tell you a lot about how well their muscles are recovering between workouts. Every training session creates normal muscle strain, but when recovery takes longer than it should, that lingering soreness can affect how your horse moves and feels the next time you ride.

 

You might notice shorter strides, resistance in transitions, a tight or hollow back, or a general sense that your horse isn’t moving as freely as usual, even when the workload hasn’t changed. Over time, these patterns can make consistent training harder to maintain.

 

MuscleMx is designed to support the muscle recovery process after exercise by providing a targeted blend of amino acids and cellular energy nutrients that help repair muscle tissue, reduce post-work fatigue, and support more comfortable movement between rides. With proper recovery support, many horses warm up more easily, stay looser through the back, handle consistent training days with less fatigue, and develop a stronger topline over time.

Buy MuscleMx

Building muscle starts with supplying enough calories

Muscle development requires more than targeted nutrients. Horses also need adequate calories to support muscle growth and maintain condition through training. If a horse is not consuming enough energy, even the best muscle formula cannot perform at its full potential. It's recommended that you provide enough high-quality forage to meet the caloric demands of your horse's training.

 

For horses that struggle to hold weight or need additional calories to support muscle development, pairing MuscleMx with a weight gain or high-calorie supplement like Formula 707 Weight Gain can help provide the fuel needed to support visible topline and muscle condition.

Certified by the National Animal Supplement Council

Spot the Quality Seal on products, indicating our commitment to rigorous NASC audits, ensuring high standards and responsible sourcing.

This Product is Show-Safe

This product contains no ingredients that are listed as prohibited, and additionally has been used by customers in major federations without issue. (If you'd like to double check, please reach out to your respective federation!)

Real Support

Want help with your order, or have general questions? Our live, Colorado-based Customer Support team is here to answer any questions you may have. Simply email us at info@formula707.com or call at 970-284-5575 (M-F, 9am-4pm MST). 

Customer Reviews

Based on 10 reviews
80%
(8)
0%
(0)
20%
(2)
0%
(0)
0%
(0)
S
Sschlac
Effective

I have a 5 year old who has been slow developing. This combined with the weight gain mixture has been a game changer for him. Natural substantial muscle and a healthy appearance. He has never refused the pellets, and finally has some mass to him.

r
r.g.

Perfect !!

M
Megan Harding

Love this product!!!
About halfway through the 1st bag and my mare loves it and I love how she is looking!

l
lawanda fennell-Morrison
Seeing results

Been using about month and half and definitely see more definition and tone. Great addition to my horses workouts.

V
Vickie lynn
Excellent

Recently switched from another muscle builder to formula 707, my horse loves the pellets hay flavor and started to notice a change to his overall figure .

M
Melissa Maza
Love this product

Works amazing!

J
John Chamberlain

To early to commit need order to be shipped as soon as possible thanks

J
John Chamberlain

To early to commit need order to be shipped as soon as possible thanks

FAQs

What is MuscleMx?

MuscleMx is a comprehensive muscle support supplement designed to help horses build and maintain lean muscle when paired with proper nutrition and training. It combines key amino acids and performance-supporting compounds commonly used in conditioning programs.

What types of horses is MuscleMx best for?

MuscleMx is great for performance horses in work, horses coming back from time off, hard keepers that struggle to hold topline, and young horses developing muscle through training.

Will MuscleMx make my horse gain weight?

MuscleMx supports lean muscle development, not fat gain. It does not add calories like a weight-gain or high-fat supplement. Most horses maintain their current body condition while improving muscle tone and topline when fed as directed.

 

For weight gain, we recommend using Formula 707 Weight Gain and/or Formula 707 Glo-N-Go Liquid. These can be fed safely in conjunction with MuscleMx. We also recommend consulting your veterinarian about your horse's overall diet.

Is MuscleMx the same as a weight builder?

No. MuscleMx focuses on muscle support and amino acids rather than adding bulk calories. If your horse needs weight gain, it can be used alongside a separate calorie or fat supplement.

How is MuscleMx different from other muscle supplements?

MuscleMx combines multiple muscle-support ingredients into one formula rather than relying on a single ingredient. It’s designed to support muscle from multiple angles, not just one pathway.

Do I need to feed it long-term?

Many horses stay on MuscleMx during training or competition seasons, while others use it during conditioning phases. Feeding duration depends on your horse’s workload and goals.

How long does it take to see results?

Many owners notice changes in muscle tone and topline within 3–4 weeks, with more visible improvement over 6–8 weeks depending on workload, diet, and genetics.

Can I feed MuscleMx to a horse in light work or turnout?

Yes. While results are most noticeable in horses in consistent work, MuscleMx can still support muscle maintenance in lightly worked or turned-out horses.

Will MuscleMx add muscle to my horse without exercise?

MuscleMx provides the nutritional building blocks that support muscle development, but it does not replace training or movement. Horses build muscle through use. MuscleMx works best when paired with regular work, conditioning, or purposeful movement, and can help support muscle maintenance in lightly worked horses.

Does MuscleMx contain stimulants or “hot” ingredients?

No. MuscleMx does not contain caffeine or stimulant-type ingredients and is suitable for horses that are sensitive or easily amped up.

Is MuscleMx safe for young or senior horses?

MuscleMx is appropriate for horses of various ages when fed as directed. Always consult your veterinarian if your horse has a medical condition or special dietary needs.

Is MuscleMx show-safe?

MuscleMx contains no known prohibited substances. Always check your specific association’s rules if you compete under drug or medication guidelines.

Customers Also Bought

A Name That's Been Trusted for Over 75 Years

When a man named John Ewing started an equine supplement called "Formula 707" in the mid-20th century, there wasn't much consideration for the benefits of feed supplements in horses.

Today, we continue his legacy with a full line of innovative products to support every horse.