8 Best Fly Supplements for Horses 2026: According to Reviews | Chewy

The 8 Best Fly Supplements for Horses

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How we created this fly supplement list

We leveraged input from our veterinarians and artificial intelligence to identify key considerations to help you find the best fly supplements for horse.
We scanned thousands of customer reviews and ratings and scored each product based on its performance against each of the key considerations. We then considered how popular a product is with Chewy customers and combined that with its key consideration scores to create the list of the best fly supplements for horses.

Key fly supplement considerations

Duration of Protection

Ease of Use

Effectiveness

Ingredients

1
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket
Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket

Farnam SimpliFly Feed-Thru Fly Control Pellets Horse Supplement, 20-lb bucket

Rated 4.7 out of 5 stars
424
$153.97 Chewy Price
($7.70/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.5/5
Great

Ease of Use

4.6/5
Excellent

Effectiveness

4.6/5
Excellent

Ingredients

4.5/5
Great

Is this fly supplement right for my pet?

Lifestage

All Lifestages, Adult

Top Ingredient

Diflubenzuron

Farm Animal Type

Horse

Food Form

Feed, Supplement
2
Formula 707 MultiFly Feed-Thru Horse Fly Control, 5-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 5-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 5-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 5-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 5-lb bag

Formula 707 MultiFly Feed-Thru Horse Fly Control, 5-lb bag

Rated 4.8 out of 5 stars
244
$34.49 Chewy Price
($6.90/lb)

Our ratings

Duration of Protection

4.4/5
Great

Ease of Use

4.6/5
Excellent

Effectiveness

4.6/5
Excellent

Ingredients

4.6/5
Excellent

Is this fly supplement right for my pet?

Top Ingredients

Wheat Middling, Alfalfa-Dehydrated, Novaluron, Calcium Carbonate, Sodium Chloride and Calcium Propionate (preservative)

Farm Animal Type

Horse

Food Form

Pellets, Feed

Health Feature

Pest Control
3
Solitude IGR Horse Fly Preventive, 20-lb bucket
Solitude IGR Horse Fly Preventive, 20-lb bucket
Solitude IGR Horse Fly Preventive, 20-lb bucket
Solitude IGR Horse Fly Preventive, 20-lb bucket
Solitude IGR Horse Fly Preventive, 20-lb bucket

Solitude IGR Horse Fly Preventive, 20-lb bucket

Rated 4.8 out of 5 stars
60
$355.19 Chewy Price
($0.56/serving)
Promo, Save 40% on your first Autoship

Our ratings

Duration of Protection

4.6/5
Excellent

Ease of Use

4.7/5
Excellent

Effectiveness

4.7/5
Excellent

Ingredients

4.6/5
Excellent

Is this fly supplement right for my pet?

Top Ingredients

Active Ingredients: Cyromazine: N-Cyclopropyl-1, 3.5-Triazine-2, 4, 6-Triamine 2.12%, Other Ingredients: 97.88%

Farm Animal Type

Horse

Food Form

Powder

Health Feature

Pest Control
4
Tribute Equine Nutrition Equine Fly Control Block Horse Supplement, 33-lb block
Tribute Equine Nutrition Equine Fly Control Block Horse Supplement, 33-lb block
Tribute Equine Nutrition Equine Fly Control Block Horse Supplement, 33-lb block
Tribute Equine Nutrition Equine Fly Control Block Horse Supplement, 33-lb block

Tribute Equine Nutrition Equine Fly Control Block Horse Supplement, 33-lb block

Rated 4.1 out of 5 stars
201
$25.99 Chewy Price
($0.60/serving)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.1/5
Great

Ease of Use

4.2/5
Great

Effectiveness

4.0/5
Great

Ingredients

4.1/5
Great

Is this fly supplement right for my pet?

Lifestage

All Lifestages, Adult

Top Ingredients

Corn Distillers Dried Grains with Solubles, Wheat Middlings, Salt, Cane Molasses, Calcium Carbonate

Farm Animal Type

Horse

Food Form

Supplement
5
The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 10-lb bag
The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 10-lb bag
The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 10-lb bag

The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 10-lb bag

Rated 4.4 out of 5 stars
41
$123.45 Chewy Price
($0.39/serving)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.5/5
Great

Ease of Use

4.5/5
Great

Effectiveness

4.7/5
Excellent

Ingredients

4.7/5
Excellent

Is this fly supplement right for my pet?

Top Ingredients

Brewer's Dried Yeast, Distiller Grains, Grape Seed Meal, Thiamine (B1), Garlic Powder

Special Diet

Natural, No Corn No Wheat No Soy, Flax-Free

Food Flavor

Original

Farm Animal Type

Cattle, Goat, Sheep, Llama & Alpaca...
6
Hilton Herbs Bye Bye Fly Garlic Granules Horse Supplement, 2.2-lb tub
Hilton Herbs Bye Bye Fly Garlic Granules Horse Supplement, 2.2-lb tub
Hilton Herbs Bye Bye Fly Garlic Granules Horse Supplement, 2.2-lb tub
Hilton Herbs Bye Bye Fly Garlic Granules Horse Supplement, 2.2-lb tub
Hilton Herbs Bye Bye Fly Garlic Granules Horse Supplement, 2.2-lb tub
Hilton Herbs Bye Bye Fly Garlic Granules Horse Supplement, 2.2-lb tub

Hilton Herbs Bye Bye Fly Garlic Granules Horse Supplement, 2.2-lb tub

Rated 4.7 out of 5 stars
26
$26.95 Chewy Price
($12.25/lb)

Our ratings

Duration of Protection

4.6/5
Excellent

Ease of Use

4.4/5
Great

Effectiveness

4.5/5
Great

Ingredients

4.3/5
Great

Is this fly supplement right for my pet?

Top Ingredient

Dehydrated Garlic Granules

Special Diet

Natural

Farm Animal Type

Horse

Food Form

Dehydrated, Supplement
7
UltraCruz Garlic Flakes Immune Support Granules Horse Supplement, 10-lb bag
UltraCruz Garlic Flakes Immune Support Granules Horse Supplement, 10-lb bag
UltraCruz Garlic Flakes Immune Support Granules Horse Supplement, 10-lb bag
UltraCruz Garlic Flakes Immune Support Granules Horse Supplement, 10-lb bag

UltraCruz Garlic Flakes Immune Support Granules Horse Supplement, 10-lb bag

Rated 4.5 out of 5 stars
18
$69.95 Chewy Price
($0.31/serving)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.2/5
Great

Ease of Use

3.9/5
Good

Effectiveness

4.1/5
Great

Ingredients

4.5/5
Great

Is this fly supplement right for my pet?

Lifestage

All Lifestages, Adult

Top Ingredient

Active Ingredients: Per recommended daily amount (1 scoop; 10 g): Dehydrated Garlic Flakes: 10 g

Farm Animal Type

Horse

Food Form

Supplement
8
Uckele Bug Nm Pellet Skin Supplement, 25-lb bag

Uckele Bug Nm Pellet Skin Supplement, 25-lb bag

Rated 5 out of 5 stars
1
$239.95 Chewy Price
($9.60/lb)
Promo, Save 40% on first Autoship with code EQSUP

Our ratings

Duration of Protection

4.6/5
Excellent

Ease of Use

4.5/5
Great

Effectiveness

4.6/5
Excellent

Ingredients

4.6/5
Excellent

Is this fly supplement right for my pet?

Top Ingredients

grape seed meal, corn distiller grains with solubles, brewers dried yeast, kelp, soybean oil

Farm Animal Type

Horse

Food Form

Pellets, Supplement

Health Feature

Pest Control