Purina Outlast Gastric Support Pellets Horse Digestive Aid, 40-lb bag

Skip image gallery
Slide 1 of 10

$47.49 Autoship Price
(-5%)
  • Keep saving 5% on every order
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$49.99 Chewy Price
($1.25 /lb)
In Stock
FREE 1-3 day delivery
Free 365-day returns

No interest if paid in full in 6 months on PayPal purchases of $149+. .

About This Item

Details

  • This Outlast supplement contains a unique blend of ingredients that are designed to support gastric balance, giving you and your horse the confidence to perform.
  • Purina’s Ph.D. Equine Nutritionists have spent hundreds of hours (and counting) researching Outlast supplement at Purina’s state-of-the-art nutrition research farm in Missouri.
  • As part of 1 rigorous testing process, hundreds of performance horses around the country participated in the nutrition research.
  • The research shows horses enjoy Outlast supplement top-dressed or fed as a snack before a stressful event.
  • Your horse’s comfort has no price, but Outlast supplement provides an affordable tool to support your horse’s gastric health.

Ingredient Information

Feeding Instructions

Fuel Every Ride with Nutrition You Can Trust

Purina feeds and supplements are carefully formulated and backed by decades of research to provide targeted, science-based nutrition that helps your horse look, feel and perform their best at every stage of life.

Helping All Horses Thrive

You want your horse to reach their full potential and live long, healthy lives—and so do we. Our love for horses combined with expert nutrition helps keep every horse feeling strong, happy, and thriving, so every ride can be better than the last.

Where Nutrition Meets Innovation

At Purina, every feed and supplement is crafted by leading equine nutritionists and proven by the horses who inspire us. We’re dedicated to horse health and setting a high standard for the future.

Proven Performance at Our Farm

We’ve conducted over 24,000 animal nutrition studies and care for more than 3,000 animals every day at our 1,200-acre farm in Gray Summit, Missouri, all to ensure Purina products deliver results you can see.

About Purina

At the heart of everything we do is our love, respect, and appreciation of animals. We’re devoted to researching and discovering what’s best for your horse.We believe that life is enhanced by raising animals, and the way we nourish them makes all the difference.

Shop Purina

Frequently bought together

Questions & Answers

2 Customer Questions

How long does the 9 and 40 pound bags last when fed at 1 cup a day?

How much sugar does this have in it?

Answer by Chewy • Jan 13, 2026
The Purina Outlast Gastric Support Pellets Horse Digestive Aid contains 6% sugar and 9% starch.
Reviews
Write a Review
4.9
Rated 4.9 out of 5 stars
30 Ratings
Terms & Conditions

25 Customer Reviews

Rated 5 out of 5 stars
By Raysofhopeinc on Nov 29, 2025
Received Free Product

Just what my horse needed!

My horse acquired Lyme disease over the summer. And had to be on antibiotics for two months .This product I believe is really a great product with all the probiotics

My horse acquired Lyme disease over the summer. And had to be on antibiotics for two months .This product I believe is really a great product with all the probiotics. to get his stomach back in shape after being on the medication.We have a 33-year-old mare I'm giving a little bit of this too every day as well. It's easily chewable very small pellets. As you can see in one of my photos, I put a match stick next to it so you can see how small the pellets really are.It's reasonably priced as well for the amount you get.. And most importantly they seem to really like it.

Rated 5 out of 5 stars
By Wombat on Dec 11, 2025
Received Free Product

The best all around GI supplement

This by far is the best GI supplement we have ever given! It’s economical, palatable and easy for my seniors to eat! They don’t pick around it like their ulcer supplement

This by far is the best GI supplement we have ever given! It’s economical, palatable and easy for my seniors to eat! They don’t pick around it like their ulcer supplement. After only a week on it our mare has quit being cinchy and silly. Our cushings mini’s diarrhea has cleared up completely! Both seem to be looking less hollow in the barrel and hind quarters. I have seen this online but was skeptical. I can feed 3 horses with 3 different issues with one product. It’s so much easier and economical! It’s worked miracles in the month we’ve been giving it. Plus it soaks easily in just a few minutes.

Rated 4 out of 5 stars
By Not happening on Dec 1, 2025
Received Free Product

Gastric Support Pellets

All three of my horses like the Purina Outlast Gastric Support Pellets, the pellets are small and obviously tasty. Now and again the girls need gastric support for

All three of my horses like the Purina Outlast Gastric Support Pellets, the pellets are small and obviously tasty. Now and again the girls need gastric support for stress if they need to stay in their stalls longer than needed, they have sensitive stomach's. It contains a blend of ingredients, like seaweed-derived calcium, magnesium and sun-cured alfalfa, I personally stick with high quality ingredients.

Rated 5 out of 5 stars
By A Busy litter box on Nov 30, 2025
Received Free Product

My ‘off-her-feed’ mule ate this willingly.

My senior mule was not eating her regular senior feed for three days. However, when I offered her this Outlast Gastric Support Supplement, she ate it energetically

My senior mule was not eating her regular senior feed for three days. However, when I offered her this Outlast Gastric Support Supplement, she ate it energetically. I was relieved and thrilled. Due to manufacturers recommendations I am using it as a “primer” to what I hope will be her regular meal intake. I am very optimistic that this will put her back on her regular routine and I will continue to use this as a supplement to her overall diet.

Rated 4 out of 5 stars
By Raech on Nov 30, 2025
Received Free Product

I think it's helping.....

I have 2 horses. Neither has shown any outward signs of ulcers but they have always been on an ulcer daily supplement as well as aloe. They are both insanely lazy

I have 2 horses. Neither has shown any outward signs of ulcers but they have always been on an ulcer daily supplement as well as aloe. They are both insanely lazy but can't say that's an ulcer issue. I have started giving them 1.5 cups before a ride in the ring (WTC work) and they both eat it (and one of VERY picky). Have only used it a few times so far and can't say I have noticed a huge difference but will keep trying it and see if there's a change

Rated 5 out of 5 stars
By Jewels on Dec 19, 2025
Received Free Product

Would recommend to everyone!

Absolutely love this product for my senior gelding! He’s been struggling with EPM and had lost quite a bit of weight. having a healthy gut is essential for horses

Absolutely love this product for my senior gelding! He’s been struggling with EPM and had lost quite a bit of weight. having a healthy gut is essential for horses struggling with epm. Since starting on outlast he has increased his weight and readily eats his food.

Rated 5 out of 5 stars
By Cedar_thegsd on Nov 21, 2025
Received Free Product

Great Product - Highly Recommend by Vets

I have used this product on and off for a few years now. It comes highly recommended by Veterinarian's and trainers to help buffer stomach acid. Thankfully my horses

I have used this product on and off for a few years now. It comes highly recommended by Veterinarian's and trainers to help buffer stomach acid. Thankfully my horses specifically have never had ulcers but I tend to use this as a preventative. For example my elder horse was recently put onto a sweet feed so I decided to add this in to help avoid any ulcers. My only qualm is the price and that chewy hasn't offered it. If chewy begins to sell it - immediately add to autoship!

Rated 5 out of 5 stars
By Pony Mom on Nov 23, 2025
Received Free Product

Top quality product

My daughter competes in the jumper, Hunter and Equitation rings on the A circuit and we use this product on all of our horses that are competing. The life of a show

My daughter competes in the jumper, Hunter and Equitation rings on the A circuit and we use this product on all of our horses that are competing. The life of a show horse can be stressful so we make sure to feed all top quality products that fuel them with the best.

Rated 5 out of 5 stars
By Lisa on Jan 4, 2026

FWS in Horses

Have a senior horse and we have been battling FWS for over 3 years. Have tried everything under the sun, adding this to his daily feed regimen, has stopped it for

Have a senior horse and we have been battling FWS for over 3 years. Have tried everything under the sun, adding this to his daily feed regimen, has stopped it for over 4 months now !! Will never be without it

Rated 5 out of 5 stars
By OlivesMom on Dec 19, 2025
Received Free Product

Great for a picky eater with a sensitive tummy

My horse has inflammatory bowel disease and a history of ulcers. Of course, he is also a picky eater. I give him a serving of this while tacking up before rides,

My horse has inflammatory bowel disease and a history of ulcers. Of course, he is also a picky eater. I give him a serving of this while tacking up before rides, and he is always happy to eat it. I think it keeps his tummy happy, too!