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The hardest part of feeding a hard-keeping horse isn’t scooping the supplement — it’s watching the weight slide back off the moment you slack off. The best energy supplements for horses solve that by packing dense, low-starch calories that turn into steady topline and glossy coat, not jittery heat. This guide breaks down the difference between calorie-dense fat, muscle-building amino acids, and daily vitamin support, so you can match the right formula to your horse’s actual job.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
From a 99% fat dry supplement to a 50% fat calming powder, here are the energy supplements for horses that owners trust to keep weight on and condition up.
Our Picks at a Glance
How To Choose The Best Energy Supplements for Horses
If your horse drops weight in winter, burns through calories during training, or just struggles to hold condition, the fix is usually adding a calorie-dense supplement to the daily ration. The trick is choosing the right energy source for the job — fat for steady weight gain, amino acids for muscle, and vitamins for overall health.
Fat: The Cool Energy Source
Fat packs more energy per pound than grain or carbohydrates, and it doesn’t cause the sugar-fueled spikiness that makes some horses hot and hard to handle. Look for formulas with a high crude fat percentage — some of the strongest options deliver 50% fat or more per serving.
Weight Vs. Muscle: Know Your Goal
A thin horse with ribs showing needs calories first, usually from fat and fiber. A fit horse that needs more topline and muscle definition benefits more from amino acids like lysine and creatine, which encourage the body to build protein rather than just store fat.
Quick Comparison
| Model | Best For | Form | Weight | Key Energy Source | Amazon |
|---|---|---|---|---|---|
| Vita E & Selenium Crumbles★ Best Overall | Daily antioxidant support | Crumbles | 3 lb | Vitamin E & Selenium | Amazon |
| Manna Pro Cool Calories 100Top Performer | Cool, high-fat weight gain | Dry | 8 lb | 99% Fat | Amazon |
| MuscleMxMuscle Builder | Muscle building & definition | Pellet | 3 lb | Lysine, Creatine, OKG | Amazon |
| HealthyCoat Feed Supplement | Coat, skin & joints | Liquid | 7.8 lb | Omega 3 & 6 Fatty Acids | Amazon |
| Weight Gain Crumble | Calorie-rich weight support | Crumble | 7 lb | Vegetable Fat & Protein | Amazon |
| Tuttle’s Liquid 747 | Appetite & stamina boost | Liquid | 10.3 lb | Molasses, Corn Oil & Vitamins | Amazon |
| Horse Guard Super Weight Gain | Hard keepers & seniors | Granule | 10 lb | Soybeans, Probiotics, 1,500 IU Vit E | Amazon |
| Pennwoods Body Builder 4000 | Topline & high-fat conditioning | Powder | 25 lb | Fat & Quality Protein | Amazon |
| Farnam Weight Builder | Long-term weight maintenance | Powder | 22.5 lb | 50% Fat, Omega-3 Fatty Acids | Amazon |
In-Depth Reviews
1. Vita E & Selenium Crumbles
Our pick — over 4.5★ from 400+ verified ratings; the strongest balance of quality and price.
The daily defender that shores up energy, immunity, and muscle recovery in one palatable crumble.
If your horse’s feed already covers the basics but you want backup for intense training or aging joints, this is the quiet workhorse of the list. Each ½ oz serving delivers 625 IU of vitamin E and 1 mg of selenium — a pair that protects muscle and nerve cells from the free radicals that form during hard work. The 3 lb bag stretches to a 96-day supply, and the seaweed flavor makes it easy to mix into grain without sorting.
What wins owners over is the quality — the top praise in the reviews is consistency. It’s a favorite for horses in low-selenium regions, with one long-time owner noting they’ve used it for years across two states where the soil lacks the mineral. Another found it helpful for a 20-year-old mare battling laminitis and shaky legs, which speaks to its role in supporting circulation and overall health.
It’s not a calorie bomb, so don’t expect visible weight gain — this is foundational support, not a conditioning feed. The crowd favorite holds a 4.8-star rating across 400+ owners, and it’s the one supplement here that you can feed year-round without second-guessing the energy source.
Foundational fuel: The antioxidant pair of 625 IU vitamin E and 1 mg selenium per serving protects cells and supports immunity, so it earns a spot in any daily ration.
Honest limit: It won’t add pounds — pair it with a calorie-dense feed if weight gain is the goal.
Reach for this if: You want a trusted daily vitamin-mineral base for performance, senior, or recovering horses.
Look elsewhere if: Your horse needs serious calorie density to put on weight — this is support, not a weight builder.
2. Manna Pro Cool Calories 100
The calorie-dense powerhouse that puts weight on without lighting a fire under your horse.
This is the heavyweight for hard keepers. At 99% fat, it delivers dense calories without the sugar crash or the heat that makes some horses spooky. Buyers report it’s the go-to for older horses that “just didn’t look thrifty” — the 8 lb bag is an 8-pound dry supplement that helps them regain weight and shine.
The effectiveness is the most-praised aspect, and the weight gain stories back it up. One owner feeds two level scoops daily to a 16-hand horse and watches the coat turn shiny and the mane turn silky. Another has used it for years on a 36-year-old horse to keep her at a healthy weight. The fatty acids also support skin and coat, so you get the bloom along with the pounds.
Because it’s pure fat, it’s not a complete vitamin source — pair it with a balanced ration. And while it’s highly palatable, the sweet-but-sugarless flavor means some picky eaters may need a few days to adjust.
What owners love
- Visible weight gain on hard keepers
- Cool, calm energy — no heat or hyperactivity
- Shiny coat and silky mane as a bonus
What to know
- Not a complete vitamin-mineral source
- 8 lb bag goes fast with two-scoop daily feeding
Best for: Owners of thin, older, or hard-keeper horses who want visible weight gain without the sugar spike.
skip it if: Your horse needs muscle building, not just fat calories — you’ll want an amino acid formula instead.
3. MuscleMx Muscle Supplement
The metabolism booster that builds definition, not just fat, for performance and show horses.
Where the Cool Calories adds weight, this 3 lb pellet formula adds shape. It combines four ingredients — lysine, creatine, gamma oryzanol, and OKG — that work together to encourage muscle-building metabolic reactions. Creatine steps up the production of ATP, the energy currency of cells, so muscles get the fuel they need to develop. The 32-serving bag from Formula 707 has been made in Colorado since 1946.
The effectiveness is what owners praise most, and the results show up in the photos: one buyer started with a photo on day one and posted updates after 32 servings showing the difference. A 19-year-old trail horse “really works great” on it, and another owner has fed it for years and will continue. It’s show-safe, which makes it a favorite for competition barns.
Because it’s a muscle supplement, it won’t do much for a horse that’s simply underweight — that horse needs fat calories first. But for a fit horse that needs topline and definition, this is the pick.
Definition drive: The combination of lysine, creatine, gamma oryzanol, and OKG in this 3-pound pellet bag is built for horses that need muscle, not fat.
Honest trade-off: It won’t fix a thin horse — pair it with a calorie-dense feed for weight, then use this for topline.
Choose this if: Your horse is at a good weight but lacks topline, muscle tone, or show condition.
Think twice if: You’re dealing with an underweight hard keeper — you need fat calories, not amino acids.
4. HealthyCoat Feed Supplement
The liquid boost that turns a dull coat into a glossy one while feeding controlled energy.
This apple-flavored liquid is rich in Omega 3 & 6 essential fatty acids and fortified with niacin, biotin, and vitamin B12, making it a multi-angle supplement for skin, coat, hooves, and joints. Because it’s easily digested and slowly metabolized, it provides a consistent level of “controlled energy” — steady fuel rather than a spike. Fed at higher rates, it even works as a safe weight builder.
Owners mention dramatic changes: one saw a mane grow about 2 inches over the summer, and another noted a significant improvement in coat, mane, and hooves. The shine is the second most-praised aspect, with buyers raving about the gloss. It’s also helped with fungus and summer bleaching, adding to its all-around appeal.
One honest warning: the liquid form means shipping damage is possible — a few units have arrived with the bottle cracked and half the contents gone. Check the seal on arrival, but the product itself earns high marks.
Gloss factor: Omega 3 & 6 fatty acids plus biotin and B12 in a 7.8-lb liquid gallon make this the coat-and-hoof specialist.
The catch: Liquid shipping can occasionally result in a damaged bottle — inspect on delivery.
Grab this for: A horse with a dull coat, brittle hooves, or skin issues that needs a slow-metabolizing energy source.
Look past it if: You need dense calorie weight gain fast — this is a conditioner, not a calorie bomb.
5. Weight Gain Crumble
The calorie-rich crumble that puts weight on seniors and hard keepers without a fight at feeding time.
This 7 lb formula from Formula 707 pairs vegetable fat with high-quality protein, so your horse gets easily digestible calories for energy and essential amino acids for muscle building. The fiber content keeps the digestive system moving smoothly, which matters for older horses. And the crumble form — not pellets, as the makers stress — is highly palatable, even for picky seniors.
The effectiveness is the top praise, with one owner halfway through the first 28-day supply reporting a hard keeper gained about 50 pounds along the topline. A senior mini eats it “very well,” and another buyer calls it “the only answer to weight gain” after trying many options. This is the stuff that works, particularly for older horses that struggle to hold condition.
One owner noted they hadn’t used it long enough to judge results, so give it the full 28-day cycle before deciding. But for a senior that’s been hard to keep weight on for years, this crumble earns its keep.
Senior solution: Vegetable fat plus high-quality protein in a 7-lb crumble helps older horses gain weight and rebuild muscle tone.
Realistic note: Results take the full 28-day supply — don’t judge it at the halfway point.
Best for: Senior horses, minis, and hard keepers who need palatable, calorie-rich support that’s easy to eat.
Not ideal if: You want a liquid additive — this is a dry crumble you mix into the ration.
6. Tuttle’s Liquid 747
The molasses-sweet liquid that boosts appetite, stamina, and overall condition in one easy pour.
This gallon of apple-flavored liquid is built on a base of cane molasses and corn oil, packing calories for energy and appetite enhancement in a form horses genuinely love. The ingredients are the most-praised aspect here.
Owners see fast results. A 20-year-old gelding that lost weight over winter filled out within two weeks — withers filled in, ribs no longer visible, coat shiny. A 30-year-old horse that failed to gain on senior feeds and worming showed improved skin, coat, and energy after just two weeks. Even a mule loves the molasses smell, which makes dosing easy.
Because it’s a liquid, it’s easy to pour over feed, and the molasses base means most horses accept it happily. It’s not the densest calorie source on this list, but for appetite and overall condition, it’s a solid pick.
Appetite answer: Cane molasses and corn oil in a 10.3-lb gallon pack calories while high levels of vitamins A, D3, E, and B vitamins cover nutritional gaps.
Good to know: It shines as an appetite and stamina booster — pair with a denser fat source for rapid weight gain.
Pick this if: Your horse is a picky eater or needs a stamina and appetite boost with broad vitamin coverage.
Pass if: You need maximum calorie density in the smallest volume — a dry fat supplement wins there.
7. Horse Guard Super Weight Gain
The 3-in-1 granule that pairs weight gain with gut health and a vitamin punch for hard keepers.
This 10 lb bag combines full-fat extruded soybeans, probiotics, and Horse Guard’s vitamin-mineral package into a single granule. The 1,500 IU of vitamin E per dose supports the immune system, while the prebiotics and probiotics boost gut health and nutrient absorption — making it ideal for stressed, recovering, or sensitive horses. Extruded soy does double duty, improving coat shine and skin health.
Effectiveness is the most-praised aspect, with owners seeing good results within 4 weeks. One horse’s coat “looked 100x better” after 3 months, and the product maintains weight on hard keepers through winter. An ex-racehorse owner calls it the best weight gain product they’ve used, and it’s trusted since 1978 for good reason.
The honest caveat is value — some owners find it pricey, and the palatability can drop if the bag goes stale from sun or long storage. The resealable bag helps preserve freshness, so store it properly. It’s a “lot of product to feed,” but the results keep buyers coming back.
Why it wins
- 3-in-1 formula: weight, coat, and digestion support
- 1,500 IU vitamin E per dose for immune defense
- Visible results seen within 4 weeks
What to weigh
- Some owners find it expensive
- Palatability drops if bag goes stale
Reach for this if: You want an all-in-one weight gain, coat, and gut-health supplement for a senior or rescue horse.
Think twice if: You’re on a tight budget — the per-serving cost runs higher than straight fat supplements.
8. Pennwoods Body Builder 4000
The family-made high-fat powder that supports topline and condition without excess sugar or starch.
This 25 lb powder is the big-bag value option for barns with multiple horses. Pennwoods makes it in small batches at their Centre Hall, Pennsylvania facility using locally sourced ingredients. The calorie-dense, high-fat formula is designed for hard keepers and horses with high energy demands, providing concentrated energy from fat and quality protein rather than sugar or starch — so you get topline support without the fizzy side effects.
Owners feed it to everything from young horses to seniors. One feeds two scoops daily to all their horses, mixed into beet pulp soaked in warm water, and reports improved hair coats, hooves, and steady body mass. A Belgian with lymphoma that lost substantial weight is filling back out on it. The effectiveness and weight support are the most-praised aspects.
The main gripe is price — one owner calls it “good stuff but way overpriced,” noting flaxseed powder is cheaper. But the 25 lb bag does last, and for a barn with several hard keepers, the convenience of one big bag outweighs the cost.
Barn-sized value: A 25-pound high-fat powder that supports topline, muscle, and coat for multiple horses without excess starch.
Honest note: Some owners feel the price is steep compared to DIY flaxseed options.
Best for: Multi-horse barns and owners who want a high-fat, low-starch conditioner for hard keepers.
Look elsewhere if: You’re feeding one horse on a tight budget — a smaller bag may serve you better.
9. Farnam Weight Builder
The 50% fat powder that delivers calm, steady calories for long-term weight maintenance.
At 50% fat, this powder provides more calories than equal weights of grain, so you feed less volume while getting more energy. The no-sugar-added formula safely adds calories without the risk of digestive upset, and the omega-3 fatty acids from flaxseed meal and heat-stabilized rice bran support healthy skin and a glossy coat. The 22.5 lb bucket provides a 90-day supply at a 4 oz serving per day.
Effectiveness is the top praise, particularly for older horses. A 30-year-old horse gained weight on it, and a 22-year-old mare that loses weight every spring maintains through winter with a full scoop and summer with half. One owner jokes it’s “the fairy godmother of horse supplements,” turning a too-lean “thoroughbred chic” steed into something more substantial.
The “calming energy” claim holds up — customers note weight gain without the heat. It’s a solid, reliable pick for seniors and hard keepers, and the bucket format keeps the powder fresh and easy to scoop.
Steady calories: With 50% fat and omega-3s from flaxseed meal, this 22.5-lb bucket delivers 90 days of calm, digestible energy per 4 oz serving.
Good to know: This is the long-haul option — it maintains weight through winter for seasonal shedders.
Choose this if: You want a 90-day supply of high-fat, no-sugar calories for an older horse or seasonal weight loss.
pass on it if: You need a granule or crumble — this is a powder that mixes into grain.
Understanding the Specs
Fat Percentage
The single most important number for weight gain. A supplement at 99% fat (like Manna Pro Cool Calories) delivers dense calories with minimal volume, while a 50% fat formula (like Farnam) offers more balanced nutrition per scoop. Higher fat means more energy per pound, which matters for hard keepers who can only eat so much.
Serving Size & Days of Supply
Check how many servings come in the bag. A 3 lb bag at 96 days (Vita E & Selenium) is a daily vitamin, while a 10 lb bag at 20 servings (Horse Guard) is a weight builder you feed more aggressively. Match the serving size to your horse’s needs and your budget — a “cheap” bag can cost more per day if the serving is large.
Energy Source: Fat vs. Amino Acids
Fat calories build weight and condition. Amino acids like lysine and creatine build muscle and topline. If your horse is thin, start with fat. If your horse is fit but lacks definition, choose an amino acid formula like MuscleMx. Many feed programs use both.
Form: Powder vs. Crumble vs. Liquid
Powders mix into grain, crumbles can be fed top-dressed, and liquids pour over feed. Picky eaters often prefer crumbles or sweet liquids like molasses-based options. Powders are easiest to hide in a full ration, while liquids are quick but risk shipping damage.
FAQ
What is the best energy supplement for a horse that loses weight in winter?
Is a fat supplement better than a grain-based calorie booster?
How long does it take to see weight gain results?
Can I feed a weight gain supplement to a senior horse safely?
What is the difference between a weight gain supplement and a muscle builder?
Are these supplements safe for horses with metabolic issues like EMS?
How do I get a picky horse to eat a new supplement?
What is the difference between a 3 lb and a 25 lb bag in terms of value?
Final Thoughts: The Verdict
Across the board, the energy supplements for horses winner is the Vita E & Selenium Crumbles because it’s the safest daily foundation for performance, senior, and recovering horses alike. If you want visible weight gain without the sugar spike, grab the Manna Pro Cool Calories 100. And for building topline and muscle definition on a fit horse, the MuscleMx is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Gardening Beyond earns from qualifying purchases. This does not affect which products we feature.