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Ship speed applies to in stock items, pending location. Does not include personalized items like engraving, embroidery, SmartPaks, or PortionPaks. Complete details on our Shipping Policies page.
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Putting your horse's supplements on AutoShip helps you take great care of your horse, so we take great care of you with SmartPerks! When you order your horse's supplements on AutoShip, you're automatically* eligible for our FREE SmartPerks benefits, including:
Learn more about SmartPerks
*At least one individual AutoShip supplement or horse's SmartPaks must be over $40. Some exclusions apply.
Visit SmartPak.com/SmartPerks or call 1-800-461-8898 for details.

Qualifying Items

Qualifying items are eligible for free shipping, every day. Look for the badge below on the product page to confirm that your item ships free!
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Ride Along Items

Ride Along items are eligible for free shipping when shipped with your next AutoShip order or any qualifying item. Look for the badge below to identify a Ride Along item.
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The frequency you selected is not eligible for SmartPerks benefits that come with AutoShip supplement orders. In order to get benefits like free shipping and 10% off, set this product to ship at least every days. What are SmartPerks?
2. Customization & Shipping Frequency
You'll love our AutoShip because it's:
  • Focused on healthy s, because consistency is key
  • Easy to snooze or cancel online, anytime
  • Totally flexible - edit your order as often as you'd like
  • Your VIP pass to FREE SmartPerks benefits
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
We're bringing you this product at the lowest price allowed by the manufacturer so you won't find it cheaper anywhere else. This also means we can't apply any further discounts or promotions.
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Maintenance dose

Choose AutoShip to become eligible to apply for the FREE Colicare Program after checkout.

ColiCare is a FREE veterinarian-directed wellness program that provides enrolled horses with up to $10,000 of colic surgery reimbursement.

How Does it Work?

  1. Order any ColiCare Eligible Product in SmartPaks
  2. Fill out the quick application online- no paperwork required!
  3. Complete the Annual Wellness Requirements every year:
  • Physical exam performed by your vet
  • Dental exam performed by your vet
  • Vaccinations administered by your vet
  • Deworming program developed with your vet that includes at least one fecal test and two deworming administrations per year

Provided you meet the requirements above, if your horse undergoes any type of colic surgery, you'll be eligible for up to $10,000 of reimbursement.

Learn More »
  • This horse already has an existing AutoShip SmartPak. Please select the "AutoShip" checkbox or enter a different horse name.
  • SmartPak Pouches are currently only available for horses receiving one daily dose supplement, but the horse you've selected is already receiving other daily dose supplements. Please select "SmartPak Strips" to add this supplement to your horse's current order or enter a different horse name.
Please call 1-800-461-8898 to order this product.
New ship same day!
These are for:
Sign in to choose an existing
  • This horse already has an existing AutoShip SmartPak. Please select the "AutoShip" checkbox or enter a different horse name.
  • SmartPak Pouches are currently only available for horses receiving one daily dose supplement, but the horse you've selected is already receiving other daily dose supplements. Please select "SmartPak Strips" to add this supplement to your horse's current order or enter a different horse name.
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Feeding Chart

Daily Serving

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.
( Cups / Meal)
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Maintenance dose

You're eligible to apply for our FREE ColiCare Program after checkout.

ColiCare is a FREE veterinarian-directed wellness program that provides enrolled horses with up to $10,000 of colic surgery reimbursement.

How Does it Work?

  1. Order any ColiCare Eligible Product in SmartPaks
  2. Fill out the quick application online- no paperwork required!
  3. Complete the Annual Wellness Requirements every year:
  • Physical exam performed by your vet
  • Dental exam performed by your vet
  • Vaccinations administered by your vet
  • Deworming program developed with your vet that includes at least one fecal test and two deworming administrations per year

Provided you meet the requirements above, if your horse undergoes any type of colic surgery, you'll be eligible for up to $10,000 of reimbursement.

Learn More »
  • This horse already has an existing AutoShip SmartPak. Please select the "AutoShip" checkbox or enter a different horse name.
  • SmartPak Pouches are currently only available for horses receiving one daily dose supplement, but the horse you've selected is already receiving other daily dose supplements. Please select "SmartPak Strips" to add this supplement to your horse's current order or enter a different horse name.
Please call 1-800-461-8898 to order this product.
New ship same day!
These are for:
Sign in to choose an existing
  • This horse already has an existing AutoShip SmartPak. Please select the "AutoShip" checkbox or enter a different horse name.
  • SmartPak Pouches are currently only available for horses receiving one daily dose supplement, but the horse you've selected is already receiving other daily dose supplements. Please select "SmartPak Strips" to add this supplement to your horse's current order or enter a different horse name.
-
+
Order within and
have it by
Shipping to
Add these items to your cart to get your estimated arrival date.
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Supports muscle & immune system function

  • Includes magnesium, vitamin E, lysine, DMG, and methionine for normal muscle function
  • Also provides ingredients for immune system health and red blood cell production
IN-SYNC 4 Pellets are designed to help support efficient muscle function, immune system health, and normal blood cell production. 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.

100% Happiness
Guarantee
HappinessGuarantee
At SmartPak, your happiness is at the core of everything we do. We back every order with our 100% Happiness Guarantee so that you can shop with confidence. If you're ever less than thrilled with your purchase, just let us know and we'll refund you right away. No hassles, no hoops, no kidding.

Other ways to support success

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Tell us what you think!

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.

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Ingredients

(Maintenance Dose = )
Ingredient Per Serving Per Pound
How the Ingredients Work
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Instructions

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Instructions for Use:
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Clinical Research

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    Reviews

    IN-SYNC 4™ is rated 4.8 out of 5 by 5.
    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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    Q & A

    Healthy Horses  ❤  Happy Riders