Independent, rider-tested reviews of tack, apparel & barn careAs an Amazon Associate we earn from qualifying purchases.
Purina Outlast SupplementNo. 4 in Supplements

Supplements · Purina

Purina Outlast Supplement

Purina Outlast Supplement is a solid daily support option for horses showing signs of gastric sensitivity, nervousness, or mild digestive upset.

8.6
8.6 / 10StirrupStreet editorial score
  • Supports gastric comfort
  • Calms girthiness
  • Palatable daily pellets
Form
Pelleted supplement
Serving Size
1-2 scoops daily (approx. 4 oz per scoop)
Bag Weight
15 lb bag

As an Amazon Associate we earn from qualifying purchases.

Overview

What it is and who it suits

Purina Outlast Supplement is a targeted nutritional formula designed specifically for horses prone to gastric discomfort, offering owners and trainers a research-backed way to support digestive health during the demands of training, competition, and daily turnout. Built around the understanding that modern performance horses face unique stressors, from trailering and stall confinement to intense exercise schedules, this supplement is formulated to buffer stomach acid and maintain a healthier gastric environment. Each scoop delivers a blend of ingredients that work to support the horse's natural digestive balance, making it a practical addition for riders who want to address gut health proactively rather than reactively.

What sets Purina Outlast apart within the equestrian supplement space is its emphasis on consistent, everyday support rather than a one-time fix. The formula includes calcium and magnesium sources along with a blend of antacids that help stabilize gastric pH, which can be particularly valuable for horses that travel to shows, undergo intense training blocks, or experience the kind of routine disruptions that often correlate with digestive upset. Riders managing horses with a history of ulcer-like symptoms, picky eating, or performance inconsistencies often turn to this supplement as part of a broader feeding strategy, pairing it with forage-first diets and measured grain intake to maximize digestive comfort and overall wellness.

Easy to incorporate into daily feeding routines, Purina Outlast comes in a palatable pelleted form that horses generally accept without issue, even when introduced alongside existing grain or supplement regimens. Equestrians appreciate that it can be fed both as an ongoing maintenance support and during higher-stress periods like competition season, clinics, or travel, when digestive upset tends to spike. For barns and individual owners alike, this product reflects Purina's broader commitment to translating equine nutrition science into accessible, usable solutions, giving riders one more tool to help their horses feel settled, perform consistently, and maintain the kind of steady appetite and condition that signals a genuinely healthy gut.

Key features

What you get

  • Supports healthy gastric environment and normal stomach pH
  • Contains seaweed-derived calcium and EstroGuard blend
  • Pelleted, palatable top-dress supplement
  • Formulated for horses prone to gastric discomfort
  • No starch or sugar added filler base
  • Convenient daily feeding with measuring scoop included

Specifications

Purina Outlast Supplement specs

FormPelleted supplement
Serving Size1-2 scoops daily (approx. 4 oz per scoop)
Bag Weight15 lb bag
Key IngredientsSeaweed-derived calcium, EstroGuard blend
Feeding TypeTop-dress with regular grain ration

Pros & cons

The good and the not-so-good

Why riders like it

  • Horses readily accept the pelleted texture
  • Noticeable reduction in girthiness and irritability for many users
  • Easy to incorporate into existing feeding programs
  • Supports horses during stressful situations like trailering or competition
  • Backed by Purina's equine nutrition research

Worth knowing

  • Higher price point compared to generic buffers
  • Results can take several weeks to become noticeable
  • Not a replacement for veterinary-diagnosed ulcer treatment
  • Large bag size may not suit owners with only one horse

Our verdict

8.6/10 · Purina Outlast Supplement

Purina Outlast Supplement is a solid daily support option for horses showing signs of gastric sensitivity, nervousness, or mild digestive upset. While it won't replace veterinary care for diagnosed ulcers, many owners report calmer, more comfortable horses after consistent use. It's palatable, easy to feed, and backed by a trusted equine nutrition brand, making it a worthwhile addition to a gut-health management routine.

Check price on Amazon