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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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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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    Cups:    ( Cups / Meal)
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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

Supports muscle & immune system function

IN-SYNC 4 Pellets are designed to help support efficient muscle function, immune system health, normal blood cell production and hair coat. The comprehensive formula includes lysine and methionine for muscle development; thiamine, niacin, riboflavin, and vitamin B12 for red blood cell production; natural vitamin E and other antioxidants for immune system function; and magnesium, selenium, and DMG for muscle function. In addition, key ingredients such as magnesium, vitamin E, lysine, and DMG may also help manage muscle discomfort.
  • Includes magnesium, vitamin E, lysine, DMG, and methionine for normal muscle function
  • Also provides ingredients for immune system health and red blood cell production

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
    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.

IN-SYNC 4™ is rated 4.5 out of 5 by 10.
Rated 5 out of 5 by from A worthy investment for a working horse. Absolutely noticed a difference in my horse after roughly 60 days using this supplement paired with increased exercise. His top line and neck are filling out and his coat has improved.
Date published: 2023-09-10
Rated 1 out of 5 by from My horse wont eat it - bad smell My horse will leave all her pellets and starve rather than eating with this supplement added. If I give her the pellets without she eats it just fine. Very frustrating!
Date published: 2022-02-14
Rated 5 out of 5 by from Life Saver! Just getting to the end of my first bag and now transferring it into my autoship smartpaks! I've owned my 14 year old, Purebred Arabian gelding for 9 years now, and since the day I got him he has been hard to catch, and i'm talking like a good hour to catch him in a medium sized dry lot paddock. I tried everything from grain, sitting and waiting, taking all other horses out of pen, not working him after he's caught etc. The only thing I could do was chase him to make him run until he was tired, which isn't fun after work or in the rain, heat, snow etc, for about an hour every time. For. nine. years. I started him on this, and literally in the first week of starting him on it, when he sees me he nickers and meets me at the gate. I read other reviews before purchasing of people saying it helped there hard to catch horses, but I was doubtful as mine had been a problem for so long, but WOW were they right. This supplement has saved my life! HIGHLY RECOMMEND
Date published: 2021-07-29
Rated 5 out of 5 by from Works very well!! Started my gelding on this about 4 months ago and he has gained weight, held and built muscle and kept his brain, which is pretty awesome considering he's been on stall rest for an injury. Very pleased with this product.
Date published: 2020-10-08
Rated 5 out of 5 by from Boost of energy and more focused I bought this one month ago and my mare is completely changed.
Date published: 2020-05-28
Rated 5 out of 5 by from It really works! I bought this for a mare who had been neglected out in a pasture for a year. Bringing her into a stall, feeding and worming helped her a lot, but she was not muscling up, especially the top-line and her coat was dull. After only one month, she blossomed and is now being ridden for the first time in 6 years.
Date published: 2019-06-04
Rated 5 out of 5 by from Amazing results I upgraded from just using Med Vet's 5000 Magnesium to this and what a difference! My mare is all muscled up now without a change in exercise and her immune system has improved. She is a think skinned TB and is always getting cuts and scrapes and now these are healing in practically a day instead of a week. It's expensive but the ingredients are amazing and worth it.
Date published: 2019-05-29
Rated 5 out of 5 by from Amazing supplement I won a 2 month supply of this supplement and used it for my crazy horse who had a previous tying up incident. Not only has In Sync prevented any new tying up incidents but it has also made my horse fill out and look more muscular. His coat is shiny, his feet are great AND he is so much calmer then before!! Not drowsy or groggy but not being a rearing, screaming freak at events like he used to be. I am beyond happy with In Sync 4 and will never take him off it.
Date published: 2017-10-12
Rated 5 out of 5 by from MVP never disappoints!! I've been feeding MVP supplements for some time now and recently added this to the diet of 2 of my horses. My 24 year old isn't riding sound, but can be lunged lightly and I've noticed better muscle quality on him just in a short time and nothing else in his diet has changed. Just started it 2 weeks ago on my barrel horse and am looking forward to seeing the changes in him as well soon. I trust MVP products and I don't feed anything but MVP supplements. I recommend this for a variety of horses, I have several friends who use it and I've seen their results which prompted me to add this to mine!
Date published: 2017-08-07
Rated 4 out of 5 by from Great! Great product, produces a great top line on my gelding
Date published: 2017-02-14
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