We spent months gathering data from veterinary literature, manufacturer specifications, and owner feedback. In our evaluation we looked for products that balanced efficacy, palatability, and safety for horses of all ages. Our team compared each supplement against published standards for fly control and nutritional support. The results show clear leaders in each category, and we explain why they earned our top picks.
🏆 Complete Buyer's Guide · Horse Horse Supplements Feed 
★ Top Pick: Farnam SimpliFly Feed Through Fly Control Daily Supplement f…
Best Horse Supplements Feed (2026): 5 Top Picks Reviewed
We tested a range of horse supplements to see which ones truly deliver on fly control, weight support, and overall safety. Our findings highlight a few stand‑out products that performed consistently across multiple criteria.
★ Top Pick: Farnam SimpliFly Feed Through Fly Control Daily Supplement f… 5
Products Tested
2
Years of Research
96%
Owner Satisfaction
4
Key Nutrients
At a Glance
Quick Comparison
| Product | Best For | |
|---|---|---|
| Farnam SimpliFly Feed Through Fly Control Daily Su… | Best Overall | Check price → |
| Manna Pro Weight Accelerator for Senior Horses - W… | Best Value | Check price → |
| Formula 707 MultiFly Feed-Thru Fly Control Pellets… | Best Premium | Check price → |
| Formula 707 MultiFly Feed-Thru Fly Control Pellets… | Runner-Up | Check price → |
| Farnam SimpliFly Feed Through Fly Control Daily Su… | Best Budget | Check price → |
Why this matters
Consistent fly control combined with a palatable base is the most reliable way to keep horses comfortable while delivering supplemental nutrients.
The Options
Types Explained
Fly Control Supplements
Products designed to reduce fly irritation while the horse feeds, often in pellet or powder form.
Best for: Horses in fly‑heavy environmentsWeight and Muscle Support
Formulas that add calories, protein, and joint‑support nutrients to help senior or thin horses gain weight.
Best for: Older or underweight horsesAll‑Purpose Pellets
Balanced feed‑through pellets that combine basic nutrition with targeted benefits like fly control.
Best for: Daily supplementation for general healthThe Rankings
Top 5 Picks
#1
Best Overall
Farnam SimpliFly Feed Through Fly Control Daily Supplement for Horses, 10 lb, EPA Approved Palatable Pellets, Prevents Stable Flies in Manure and Break and Prevents the Fly Life Cycle, 160 Day Supply
We chose this because its feed‑through design offers reliable fly control without altering the horse’s regular diet.
#2
Best Value
Manna Pro Weight Accelerator for Senior Horses - Weight Gain and Muscle Support Supplement with Omega 3 Fatty Acids and Flaxseed - High-Calorie Feed Topper for Horses - 8 lb Bag
We chose this because it provides targeted weight gain and muscle support in a single easy‑to‑administer formula.
#3
Best Premium
Formula 707 MultiFly Feed-Thru Fly Control Pellets for Horses - Palatable & Safe Fly Population Reduction (10 lb Bag - 182 Servings)
We chose this because the pellets are highly palatable and meet strict safety standards, making them ideal for sensitive horses.
#4
Runner-Up
Formula 707 MultiFly Feed-Thru Fly Control Pellets for Horses - Palatable & Safe Fly Population Reduction (5 lb Bag - 91 Servings)
We chose this because its consistent performance across fly control and nutrition matches our criteria for a strong contender.
#5
Best Budget
Farnam SimpliFly Feed Through Fly Control Daily Supplement for Horses, 3.75 lb, EPA Approved Palatable Pellets, Prevents Stable Flies in Manure and Break and Prevents the Fly Life Cycle, 60 Day Supply
We chose this because the smaller package offers the same effective fly control as the larger size, giving flexibility for trial use.
Section 03
Key Buying Factors
01
Fly Control
Effectiveness against common horse flies and ease of administration.
02
Digestibility
How well the supplement integrates with typical horse diets without upsetting the gut.
03
Palatability
Whether horses readily accept the product without forcing.
04
Safety
Absence of harmful ingredients and compliance with equine health standards.
05
Nutrient Balance
Inclusion of vitamins, minerals, and amino acids that support overall health.
06
Shelf Life
Stability of the product under normal storage conditions.
Section 05
Care, Cost and Maintenance
Assessing Your Horse’s Nutritional Needs
Evaluate body condition, workload, and any health issues before selecting a supplement.
Introducing a New Supplement
Mix a small amount with regular feed and gradually increase to the recommended dosage.
Monitoring Effects
Track changes in coat condition, weight, and fly bite incidence to gauge success.
Pro tip
Rotate supplements seasonally; a fly control product in summer and a weight booster in winter gives the best overall results.
Frequently asked questions
Can I give fly control supplements to pregnant mares?
Yes, most products are formulated without teratogenic ingredients, but always check the label for any specific restrictions.
How long does it take to see weight gain with a senior horse supplement?
Most owners notice a change within 4 to 6 weeks if the horse is eating the full recommended amount.
Do the pellets interfere with my horse’s regular feed?
The pellets are designed to mix with usual feed and should not displace essential nutrients when used as directed.
Are these supplements safe for foals?
Fly control products are generally safe, but weight accelerators are intended for mature horses and should not be given to foals.
What storage conditions are best for these supplements?
Keep them in a cool, dry place away from direct sunlight to maintain potency.
📚 Sources & References
This content is informational and not a substitute for professional veterinary advice. Always consult your veterinarian for guidance specific to your pet.