Horses that struggle with maintaining a healthy weight can benefit from targeted, calorie-dense supplements that support energy, coat health, and overall vitality. This guide reviews five reliable options designed to help hard-keepers, seniors, and performance horses gain weight safely. Each product leverages fats, probiotics, and select nutrients to promote steady growth, topline development, and improved conditioning. Below, you’ll find concise overviews and practical buying tips to compare options quickly.
| Product | Brand | Why It Stands Out |
|---|---|---|
| Manna Pro Weight Accelerator for Senior Horses | Manna Pro | High fat and calories; Omega-3 from flaxseed; senior-specific nutrition |
| Farnam Weight Builder Weight Support | Farnam | 50% fat; high-calorie density with easy digestibility |
| Horse Guard Super Weight Gain 40 lb | Horse Guard | 3-in-1 formula with full-fat soy, probiotics, vitamins |
| Formula 707 Weight Gain Crumble | Formula 707 | Palatable, calorie-rich crumble; supports metabolism and muscle |
| Nutramount Weight Gain Supplement | Nutramount | Omega-3 flaxseed formula; gentle, high-fat calories |
Manna Pro Weight Accelerator for Senior Horses

The Manna Pro Weight Accelerator for Senior Horses is designed to help aging horses gain and maintain body condition with a high-fat, high-calorie formula. It targets energy needs and vitality in older horses, while flaxseed-derived Omega-3 fatty acids support skin hydration and a glossy coat. Probiotics aid digestion, and biotin helps hoof strength, all while keeping starch levels controlled to support metabolic health. This combination aims to deliver energy, immunity, and joint support in one supplement, making it a practical choice for seniors with appetite or conditioning challenges.
Farnam Weight Builder Weight Support

Farnam Weight Builder provides a nutritionally balanced, high-fat formula that delivers 50% fat, yielding more calories per weight than many grains. This enhances calorie intake with less bulk, making it easier to reach energy targets without overwhelming the horse’s digestion. Importantly, it supplies calories without added sugar, reducing the risk of digestive upset while supporting steady weight gain and improved body condition over time.
Horse Guard Super Weight Gain 40 lb

This 3-in-1 formula blends full-fat extruded soybeans, probiotics, and a vitamin-mineral package to support weight gain, coat health, and digestion. It is positioned as a reliable option for senior, rescue, or underweight horses, offering visible improvements in weight and topline alongside better energy levels. The soy-based calories can contribute to shinier coats and better overall appearance, which can translate into greater horse confidence and welfare.
Formula 707 Weight Gain Crumble

Formula 707 Weight Gain Crumble offers a palatable, calorie-rich supplement designed to support hard-keeping and senior horses. The crumble form is easy to feed and can be mixed with regular feed. It includes vegetable fat for easily digestible calories and high-quality protein to supply essential amino acids for muscle building. This product emphasizes metabolic support and energy without compromising digestion or appetite.
Nutramount Weight Gain Supplement

Nutramount’s Omega-3 flaxseed formula emphasizes coat and skin health while providing natural high-calorie support for weight gain. The supplement is crafted to deliver gentle, high-fat calories that don’t overload grain intake. This makes it suitable for horses needing extra energy without dramatic changes to their regular feeding schedule, supporting training, turnout, and daily activity with steady energy.
Buying Guide: Key Purchase Considerations
- Calorie density and fat content: Higher fat formulas generally deliver more calories per serving, which is crucial for hard keepers. Look for products with a clear fat percentage and energy density to estimate daily intake.
- Digestibility and gut health: Probiotics, prebiotics, and easily digestible fats help minimize digestive upset. For senior horses or those with sensitive stomachs, choose formulas featuring digestible fats and supporting gut comfort.
- Omega-3 fatty acids and coat health: Flaxseed-derived Omega-3s support skin and coat condition, which can reflect overall health and well-being on weight-gain programs.
- Palatability and feeding form: Palatable crumbles or topper formats can improve acceptance, especially for horses reluctant to eat extra feed. Consider whether your horse prefers pellets, crumbles, or toppers.
- Senior-specific vs general formulations: Senior formulations often include joint support, hoof nutrition, and digestion aids tailored to older horses. General weight gain supplements may prioritize calories and energy but lack extras that benefit aging horses.
- Feeding plan compatibility: Ensure the product fits with your current ration and does not require excessive changes in grain or hay. Start with small adjustments and monitor body condition, energy, and manure consistency.
- Veterinary guidance: For horses with medical conditions (metabolic concerns, insulin resistance, or ulcers), consult a veterinarian before adding high-fat supplements or concentrated calories.
- Label and dosing clarity: Clear feeding directions and ingredient lists help you manage daily intake accurately and avoid overfeeding.
- Product variety: Having options (crumble, topper, supplement) allows fine-tuning of calories without overfeeding total concentrate and supports individualized conditioning programs.
When selecting a weight-gain product, balance calorie density with digestibility and coat health benefits. Consider whether you need senior-specific benefits, such as improved joint support or hoof strength, alongside appetite and energy. The right choice should align with your horse’s age, metabolism, activity level, and overall health, delivering steady gains in weight and topline while maintaining comfortable digestion and sustainable energy for daily performance.