Purina Outlast Gastric Support Supplement
Purina Outlast is positioned as the go-to gastric support supplement for horses on fermentable fiber programs because it specifically targets stomach buffering and mucosal support, helping horses maintain appetite and forage intake while on high-fiber rations. Unlike complete high-fiber or high-fat feeds in this list, Outlast is a flexible, cost-effective top-dress that pairs with products like Fibre-Max or Fibre O'Plus to protect gastric health without adding bulk calories, making it a prudent financial choice for producers who want targeted protection rather than replacing a whole feed.
Long-lasting buffer - gentle hug
Soothes stomach lining - calm coat
Long-lasting buffer - gentle hug
Soothes stomach lining - calm coat
Review Summary
"Long-term users generally report consistent reduction in gastric discomfort and improved appetite when used daily, though some note results take weeks and the supplement can be pricier than alternatives. Palatability and ease of dosing earn frequent praise, with occasional reports of variable responses in severe ulcer cases."
Simple daily dosing - pocket-ready
Pelleted supplement formulated to support gastric comfort and buffering
Simple daily dosing - pocket-ready
Pelleted supplement formulated to support gastric comfort and buffering
Enhanced Physical Well-Being
Time-Saving Convenience
Purina Outlast is positioned as the go-to gastric support supplement for horses on fermentable fiber programs because it specifically targets stomach buffering and mucosal support, helping horses maintain appetite and forage intake while on high-fiber rations. Unlike complete high-fiber or high-fat feeds in this list, Outlast is a flexible, cost-effective top-dress that pairs with products like Fibre-Max or Fibre O'Plus to protect gastric health without adding bulk calories, making it a prudent financial choice for producers who want targeted protection rather than replacing a whole feed.
Long-lasting buffer - gentle hug
Soothes stomach lining - calm coat
Simple daily dosing - pocket-ready
Pelleted supplement formulated to support gastric comfort and buffering
Includes fermentable fibers and prebiotic ingredients to support hindgut fermentation and digestive energy
Long-lasting buffer - gentle hug
Soothes stomach lining - calm coat
Simple daily dosing - pocket-ready
Pelleted supplement formulated to support gastric comfort and buffering
Includes fermentable fibers and prebiotic ingredients to support hindgut fermentation and digestive energy
$80-150 USD
Masterfeeds Fibre-Max Horse Feed
Masterfeeds Fibre-Max is a market-leading complete feed formulated around fermentable fiber sources to deliver steady digestive energy and promote weight gain with predictable feed-to-gain economics. As a full ration it simplifies feed management compared with supplements like Purina Outlast or Mad Barn W-3 Oil, offering a competitive price-per-ton and consistent nutrient matrix that reduces the need for multiple add-ons while still being complementary to gastric supports when managing sensitive horses.
High fermentable fiber - slow burn
Promotes weight gain - fills out
High fermentable fiber - slow burn
Promotes weight gain - fills out
Review Summary
"Owners using Fibre-Max over months praise steady weight gain and improved gut fill in harder-keeper horses, and many find it mixes well with other rations; a minority mention occasional dustiness and that results are slower in very thin animals. Overall considered a reliable, digestible high-fibre feed for condition and digestive health."
Barn-friendly feed - crowd pleaser
Complete feed with a high proportion of fermentable fiber to provide steady digestive energy
Barn-friendly feed - crowd pleaser
Complete feed with a high proportion of fermentable fiber to provide steady digestive energy
Enhanced Physical Well-Being
Time-Saving Convenience
Masterfeeds Fibre-Max is a market-leading complete feed formulated around fermentable fiber sources to deliver steady digestive energy and promote weight gain with predictable feed-to-gain economics. As a full ration it simplifies feed management compared with supplements like Purina Outlast or Mad Barn W-3 Oil, offering a competitive price-per-ton and consistent nutrient matrix that reduces the need for multiple add-ons while still being complementary to gastric supports when managing sensitive horses.
High fermentable fiber - slow burn
Promotes weight gain - fills out
Barn-friendly feed - crowd pleaser
Complete feed with a high proportion of fermentable fiber to provide steady digestive energy
Balanced calories and protein to support gradual weight gain and muscle condition
High fermentable fiber - slow burn
Promotes weight gain - fills out
Barn-friendly feed - crowd pleaser
Complete feed with a high proportion of fermentable fiber to provide steady digestive energy
Balanced calories and protein to support gradual weight gain and muscle condition
$40-75 USD
Brooks Fibre O'Plus
Brooks Fibre O'Plus is a premium, low-starch, high-fiber feed designed to maximize hindgut fermentation for sustained energy and gradual weight gain, favored when metabolic stability is a priority alongside conditioning. Technically it differentiates itself from commodity high-fiber feeds by using a more targeted fiber profile and fortified balancer approach, which can deliver more precise nutrient delivery for owners willing to pay a modest premium for consistency and reduced need for separate vitamin/mineral supplements.
Soluble fiber boost - belly bliss
Supports steady digestion - mellow gut
Soluble fiber boost - belly bliss
Supports steady digestion - mellow gut
Review Summary
"Users report sustained improvement in body condition and easier keeping of older or metabolic horses after extended use, with good palatability and consistency cited commonly; a few riders find it bulky and adjust feeding volumes. Generally recommended for long-term digestive support and gentle weight maintenance."
Condition building - soft rounding
Contains long‑fiber sources and beet pulp to encourage slow, steady hindgut fermentation
Condition building - soft rounding
Contains long‑fiber sources and beet pulp to encourage slow, steady hindgut fermentation
Enhanced Physical Well-Being
Time-Saving Convenience
Brooks Fibre O'Plus is a premium, low-starch, high-fiber feed designed to maximize hindgut fermentation for sustained energy and gradual weight gain, favored when metabolic stability is a priority alongside conditioning. Technically it differentiates itself from commodity high-fiber feeds by using a more targeted fiber profile and fortified balancer approach, which can deliver more precise nutrient delivery for owners willing to pay a modest premium for consistency and reduced need for separate vitamin/mineral supplements.
Soluble fiber boost - belly bliss
Supports steady digestion - mellow gut
Condition building - soft rounding
Contains long‑fiber sources and beet pulp to encourage slow, steady hindgut fermentation
Provides concentrated calories from fiber rather than starch to support weight gain
Soluble fiber boost - belly bliss
Supports steady digestion - mellow gut
Condition building - soft rounding
Contains long‑fiber sources and beet pulp to encourage slow, steady hindgut fermentation
Provides concentrated calories from fiber rather than starch to support weight gain
$35-70 USD
Shur-Gain High Fat High Fibre
Shur-Gain High Fat High Fibre combines elevated energy density from added fat with fermentable fiber to promote efficient weight gain without increasing meal volume, making it ideal for horses that need calories but have limited intake capacity. Financially and technically it can be more efficient than adding straight oils like Mad Barn W-3 because it is a ready-to-feed formulation that balances calories and fiber in one product, accelerating condition gains while still supporting digestive fermentation.
High-fat energy - pocket rocket
Fiber stabilizes gut - steady vibes
High-fat energy - pocket rocket
Fiber stabilizes gut - steady vibes
Review Summary
"Long-term feeders appreciate the noticeable weight and topline gains and the product's energy without high starch, though some customers report variability between batches and occasional feed delivery issues. Overall seen as effective for adding condition and supporting digestion when fed consistently."
Calorie-dense mix - quick condition
Higher fat inclusion for added calories while preserving fermentable fiber content
Calorie-dense mix - quick condition
Higher fat inclusion for added calories while preserving fermentable fiber content
Enhanced Physical Well-Being
Time-Saving Convenience
Shur-Gain High Fat High Fibre combines elevated energy density from added fat with fermentable fiber to promote efficient weight gain without increasing meal volume, making it ideal for horses that need calories but have limited intake capacity. Financially and technically it can be more efficient than adding straight oils like Mad Barn W-3 because it is a ready-to-feed formulation that balances calories and fiber in one product, accelerating condition gains while still supporting digestive fermentation.
High-fat energy - pocket rocket
Fiber stabilizes gut - steady vibes
Calorie-dense mix - quick condition
Higher fat inclusion for added calories while preserving fermentable fiber content
Supports gradual weight gain without increasing starch load that can upset the gut
High-fat energy - pocket rocket
Fiber stabilizes gut - steady vibes
Calorie-dense mix - quick condition
Higher fat inclusion for added calories while preserving fermentable fiber content
Supports gradual weight gain without increasing starch load that can upset the gut
$45-85 USD
Mad Barn W-3 Oil
Mad Barn W-3 Oil is a concentrated omega-3 oil supplement intended to boost caloric density and palatability of fermentable fiber rations, allowing precise incremental increases in energy for weight gain without adding starch. Compared with ready-made high-fat feeds such as Shur-Gain, W-3 offers technical flexibility and often lower immediate cost for small-scale adjustments because it can be dosed to taste and mixed into existing high-fiber feeds, though it does mean owners must manage dosing and blending themselves.
Omega-3 boost - glossy finish
Calorie-rich oil - weight helper
Omega-3 boost - glossy finish
Calorie-rich oil - weight helper
Review Summary
"Repeat users frequently praise W-3 Oil for improving coat shine, digestion and gradual weight gain with easy daily dosing and minimal side effects; many note visible results within weeks. It's widely regarded as a high-quality omega supplement for long-term metabolic and condition support."
Anti-inflammatory support - chill coat
Concentrated omega‑3 oil that boosts caloric density without adding starch or fermentable carbs
Anti-inflammatory support - chill coat
Concentrated omega‑3 oil that boosts caloric density without adding starch or fermentable carbs
Enhanced Physical Well-Being
Time-Saving Convenience
Mad Barn W-3 Oil is a concentrated omega-3 oil supplement intended to boost caloric density and palatability of fermentable fiber rations, allowing precise incremental increases in energy for weight gain without adding starch. Compared with ready-made high-fat feeds such as Shur-Gain, W-3 offers technical flexibility and often lower immediate cost for small-scale adjustments because it can be dosed to taste and mixed into existing high-fiber feeds, though it does mean owners must manage dosing and blending themselves.
Omega-3 boost - glossy finish
Calorie-rich oil - weight helper
Anti-inflammatory support - chill coat
Concentrated omega‑3 oil that boosts caloric density without adding starch or fermentable carbs
Useful to increase weight and condition when mixed into fiber-based feeds
Omega-3 boost - glossy finish
Calorie-rich oil - weight helper
Anti-inflammatory support - chill coat
Concentrated omega‑3 oil that boosts caloric density without adding starch or fermentable carbs
Useful to increase weight and condition when mixed into fiber-based feeds
$60-140 USD