Maintaining a healthy weight in horses is essential for their overall health, performance, and longevity. Whether your horse is a senior, a hard keeper, or an athlete needing muscle support, specialized weight gain supplements can provide the necessary calories, fats, and nutrients to boost vitality and improve body condition. Below is a summary table of highly recommended weight gain supplements available on Amazon, followed by detailed reviews and a buying guide to help you choose the best product for your equine companion.
| Product | Brand | Key Feature |
|---|---|---|
| Manna Pro Weight Accelerator for Senior Horses | Manna Pro | High fat and calories with Omega-3 for skin & coat support |
| Super Weight Gain 10 lb, Equine Vitamin Mineral Supplement | Horse Guard | Boosts healthy weight with probiotics for digestion |
| Farnam Weight Builder Weight Support Supplement | Farnam | High-fat, easy digestible calories with no sugar added |
| Formula 707 Weight Gain Crumble Equine Supplement | Formula 707 | Palatable, calorie-rich support for metabolism and muscle |
| Manna Pro Cool Calories 100 – Equine Fat Supplement | Manna Pro | 99% fat formula for energy without starch or sugar |
Manna Pro Weight Accelerator for Senior Horses

Manna Pro Weight Accelerator is a highly specialized supplement designed to support weight gain and muscle health in senior horses. Its high fat and calorie content help aging horses maintain optimal body condition and energy levels. The inclusion of Omega-3 fatty acids derived from flaxseed promotes skin hydration, reduces dryness, and supports a shiny coat. This supplement also contains probiotics to enhance digestion, biotin for improved hoof strength, and controlled starch levels to manage metabolic health. It provides comprehensive nutrition aimed at vitality and joint mobility for seniors.
Super Weight Gain 10 lb, Equine Vitamin Mineral Supplement

The Horse Guard Super Weight Gain supplement provides an innovative formula designed to boost healthy weight gain while supporting digestive health. It combines essential vitamins, minerals, and a blend of prebiotics and probiotics to optimize gut function, ensuring balanced mass development. This product supports muscle definition and enhances coat shine, making it suitable for horses that require visible improvement in condition without drastic diet changes. It encourages vitality and is effective for horses preparing for competitive events or those needing extra calories.
Farnam Weight Builder High-Fat Weight Support Supplement

Farnam Weight Builder offers a highly concentrated high-fat formula delivering 50% fat to provide more calories per volume than grain. The supplement contains no added sugar, providing safe calorie addition without causing digestive upset. It supports maintaining optimal body condition and weight with easily digestible calories suitable for hard keepers and horses needing extra energy. This 7.5 lb supply is formulated for sustained weight support, making it reliable for long-term feeding programs.
Formula 707 Weight Gain Crumble Supplement for Horses

Formula 707 Weight Gain Crumble is a palatable, calorie-rich supplement designed to help horses maintain healthy metabolism, muscle tone, and energy levels. Unlike pellets, the crumble form makes it highly palatable for selective eaters. It includes vegetable fats providing easily digestible calories and superior protein quality that supplies essential amino acids for muscle building. This product caters well to hard-to-keep horses, senior horses, and those needing comprehensive nutritional support.
Manna Pro Cool Calories 100 – Concentrated Equine Fat Supplement

Manna Pro Cool Calories 100 is a highly concentrated dry fat supplement with 99% fat content, making it an excellent source of slow-release energy without starch or sugars. This is ideal for performance horses, hard keepers, or seniors who require additional calories without behavioral side effects associated with sugars. The vegetable fat source supports weight gain, muscle maintenance, and a shiny coat while minimizing grain intake. This low-starch formula offers cool-burning energy that sustains stamina during peak activity.
Buying Guide: How to Choose the Best Weight Gain Supplements for Horses
Choosing the right weight gain supplement depends on your horse’s specific needs, age, health status, and lifestyle. Below are key factors and comparison perspectives to consider when selecting a product:
Calorie and Fat Content
High-fat content supplements deliver more calories per serving than grain, helping hard keepers and seniors gain weight efficiently. Look for products that specify fat percentage, ideally above 40%, to provide sustained energy without excessive feed volume.
Protein Quality and Muscle Support
Supplements containing high-quality protein and essential amino acids support muscle development and maintenance. Horse supplements enriched with branched-chain amino acids or complete protein sources are beneficial for active and performance horses.
Digestive Health Ingredients
The inclusion of probiotics and prebiotics aids digestion, ensuring better nutrient absorption and gut health. This is particularly important for sensitive horses or those prone to digestive upset.
Age and Metabolic Considerations
Senior horses often have unique dietary needs, including controlled starch levels and added nutrients to support joints, hooves, and coat health. Supplements with ingredients like biotin, Omega-3 fatty acids, and controlled sugars are optimal for mature horses.
Palatability and Form
Some horses refuse pellets but may accept crumbled or powdered supplements. Palatable forms improve acceptance and ensure consistent intake. Daily fresh packs can offer convenience and maintain nutrient integrity, especially for travel or events.
Additional Benefits
Consider supplements that also promote hoof quality, coat shine, and immune support. These multi-benefit products provide comprehensive wellness alongside weight gain, contributing to overall equine health.
By evaluating these factors relative to your horse’s condition and goals, you can choose a weight gain supplement that supports healthy body condition effectively and safely.