Skip to product information
1 of 1


Purina Outlast Gastric Support Supplement 40LB

Purina Outlast Gastric Support Supplement 40LB

Regular price $44.99
Regular price Sale price $44.99
Sale Sold out
Purina® Outlast® Gastric Support Supplement is formulated to support gastric health and proper pH. It is estimated that up to 90 percent of active horses experience gastric discomfort, a­ffecting health, attitude and performance. Common activities including stall confinement, exercise, transportation, weaning and few environments such as events and shows are known to cause stress and gastric discomfort. Purina® Outlast® Gastric Support Supplement was developed by our Ph.D. Equine Nutritionists to support a healthy gastric environment.

Features & Benefits


Outlast® supplement contains a unique blend of ingredients that are designed to support gastric balance, giving you and your horse the confidence to perform.

Designed to Support Gastric Balance

Purina's Ph.D. Equine Nutritionists have spent hundreds of hours (and counting) researching Outlast® supplement at our state-of-the-art nutrition research farm in Missouri.

Field-tested and Horse-approved

As part of our rigorous testing process, hundreds of performance horses around the country participated in our nutrition research.

Flexible Feeding

Our research shows horses enjoy Outlast® supplement top-dressed or fed as a snack before a stressful event.

Incredible Value

Finally, while we know your horse’s comfort has no price, Outlast® supplement provides an a­ffordable tool to support your horse’s gastric health.


Min / Max
Crude Protein
13.00 %
Crude Fat
1.10 %
Crude Fiber
17.00 %
Calcium (Ca)
4.00 %
Calcium (Ca)
5.00 %
Phosphorus (P)
0.45 %
Neutral Detergent Fiber (NDF)
35.00 %
Acid Detergent Fiber (ADF)
21.00 %

Feeding Directions

This product is designed to be top-dressed on your horse's regular feed ration and/or fed as a snack within one hour prior to engaging in a potentially stressful event such as exercising, traveling, confinement, etc.

The feeding rate for both the top-dress and the snack is 20 grams per 100 to 125 lbs. body weight. For example, a 1,000 to 1,250 lb. horse would receive 200 grams of the supplement per feeding. This feeding rate is equivalent to 1.25 cups (10 ounces with a dry-good measuring cup). See chart for specific recommendations.

Typical feeding rate is 3 to 4 times per day -- top-dressed with each meal and a snack 30 to 60 minutes prior to a stressful event. Do not feed more than 6 times per day at the recommended rates for your horse's weight.

Meals of ULTIUM® Gastric Care Horse Formula or RACE READY® GT Race Horse Formula include OUTLAST™ Gastric Support Supplement, so each meal will count as one OUTLAST™ supplement top-dress/snack. Changes in feeding should be made gradually.

For best results, feed OUTLAST™ supplement along with an appropriate PURINA® Horse Feed for your horse's lifestyle, fed at recommended rates. Provide adequate forage (minimum of 1.2% of body weight) in the overall diet to maintain normal digestive function in the horse. Amounts of OUTLAST™ Supplement to Feed Per Top-dress at Meals and/or Snacks:
Horse Body Weight (lbs.) Supplement (grams by weight) Number of Cups* per Meal or Snack
3.0500 to 750 100 0.75
750 to 1,000 150 1.00
1,000 to 1,250 200 1.25
1,250 to 1,500 250 1.50
1,500 to 1,750 300 1.75
1,750 to 2,000 350 2.00

*Standard 8-ounce kitchen measuring cups when measured by volume.
Store in a dry, well-ventilated area protected from rodents and insects. Do not feed moldy or insect infested feed to animals as it may cause illness, performance loss or death. USE ONLY AS DIRECTED
View full details

Are you sure you have everything?

We have everything a horse owner needs for their barn

Shop Barn Supplies

Want us to bring your products to your door?

Learn more about our local farm delivery