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From: Price: $ $ $ $ $ $ $ $ $ $/day $/day $ $ $ $/day Member Price
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Shipping Frequency: AutoShips every 28 days (details) AutoShips every  days (details) One-time Ship
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  • Focused on healthy s, because consistency is key
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PLUS! You'll save % on every shipment if you order this product on AutoShip PLUS! You'll save % on every shipment if you order this product on AutoShip
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Feeding Chart

Daily Serving

Feeding Chart
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
This is only a guide. Please consult your veterinarian to determine the perfect feeding amount for your dog.
Only SmartPaks on AutoShip make you eligible to apply for the FREE ColiCare Program. Colicare is a free program that provides up to $15,000 in colic surgery reimbursement
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Please call 1-800-461-8898 to order this product.
Only SmartPaks on AutoShip make you eligible to apply for the FREE ColiCare Program. Colicare is a free program that provides up to $15,000 in colic surgery reimbursement
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Product Overview

Nutrition for horses fed grass-type forage

Mega-Cell™ (Pellet) is a well-balanced multi-vitamin and mineral supplement formulated to coincide with current NRC (National Research Council) recommended daily requirements, to accommodate feeding programs consisting of grass-type hays (timothy, coastal, Bermuda, native grass)/grain-based diets. The addition of live, stabilized direct fed microbials, live cell yeast culture, and amino acid content, sourced from alfalfa meal, rice bran, and soybean meal makes Mega-Cell™ an excellent choice to support growth, stamina, conditioning, and maximum performance for all disciplines.

Note: To accommodate feeding programs consisting of alfalfa hay/grain based diets, choose Mega-Mag™.

View our Multi-Vitamin Supplement Comparison Chart
  • Comprehensive selection of vitamins & minerals plus probiotics, yeast & amino acids
  • Formulated to coincide with current NRC (National Research Council) recommended daily requirements

Learn More

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

  • Simplify with SmartPaks | Consistent, Custom, Convenient
    We take the guesswork out of serving sizes, ensuring your horse gets the right amount, every time. SmartPaks have airtight seals to ensure that your horse always has the freshest supplements available. Your horse is unique and his supplements should be too. Choose from over 230 supplements to get everything he needs, nothing he doesn't. We print your horse's name on every Pak so there are no mix-ups, making feeding time fast, accurate and easy! Unlike most buckets, SmartPaks are made from recycled plastic and can be recycled again! We'll send your SmartPaks on time so you never run out, with total flexibility and no commitment. Plus all SmartPaks over $40 receive free ground shipping.


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.

Mega-Cell™ is rated 4.7 out of 5 by 245.
Rated 5 out of 5 by from Amazing I’ve been using this for a few months and the difference it has made is amazing. My 19 year old appendix is dappling, and his coat is shiny. I LOVE this product
Date published: 2023-07-08
Rated 3 out of 5 by from okay for the money but there are better products ive used this product for about 2 months and bought it because i wanted a vitamin/mineral supplement for my mare because i switched to a forage-based diet. it worked somewhat for what i needed (i don’t know for sure considering it’s just a vitamin/mineral supplement) but after further research i noticed that it has 3 inflammatory ingredients listed in the top 5 ingredients (corn, soy, and wheat) and immediately cancelled my autoship smartpaks. it’s a very affordable option and for that i do recommend it. it’s not a bad supplement by any means but i’ve a better, higher quality supplement without the inflammatory ingredients
Date published: 2023-05-22
Rated 5 out of 5 by from EMS/IR Friendly This was the only EMS/IR friendly product that I could find, AND it’s super affordable :) I do have to soak it with feedings, neither of my horses will eat it as a top dressing.
Date published: 2023-03-22
Rated 5 out of 5 by from Helps keep my horse healthy! I purchased this product about 2 months ago to help my horse out with his overall health. He had started to lose weight, even though he was in little to no work while on stall rest. Not wanting to increase his concentrates, I opted to look for a supplement to help him out - and Mega-Cell was it! The nutrients he gets from his dose of Mega-Cell helped him to stop dropping weight without having to increase the amount of grain he was getting. His overall health seems better too - he's brighter, the quality of his hooves seems better, and he looks forward to his meals! Plus, I think it smells really good too! Overall, I am thrilled with the results I have seen with this product so far.
Date published: 2023-03-01
Rated 5 out of 5 by from Will order again Got to supplement a horse and a mule that live on air and don’t get enough grain to meet vitamin needs. Winter coats are coming in and horse is still dappled and stunning. Both gobble it up without a second thought.
Date published: 2022-11-15
Rated 5 out of 5 by from a good daily supplement for extra magnesium! Ive used this product to balance my horses diet and give my boys some extra magnesium. It has a somewhat calming effect on both of them.
Date published: 2022-07-29
Rated 3 out of 5 by from You only get half the supply!! The bags Guaranteed Analysis is Per 2oz, smartpaks maintence dose is only 1oz! Better to buy in bulk since 400 day supply is really only 200 if you feed 2oz :(
Date published: 2022-07-26
Rated 5 out of 5 by from Great Value My vet wanted me to put my horse on something that had probiotics and amino acids. This fills in those gaps for a great value. Highly reccomend.
Date published: 2022-04-04
Rated 5 out of 5 by from We have seen a major difference in Outlaw walking and seems to be in less pain
Date published: 2022-02-23
Rated 5 out of 5 by from We Love Mega-Cell! Mega-cell has been a life saver for my horse, who cannot have any grain. She looks and feel great! I can sleep at night knowing she gets all the nutrients she needs. You can't beat the price either!
Date published: 2022-01-13
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