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

The 6 Best Fly Supplements for Horses

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

Our Top Picks

1
Formula 707 MultiFly Feed-Thru Horse Fly Control, 10-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 10-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 10-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 10-lb bag
Formula 707 MultiFly Feed-Thru Horse Fly Control, 10-lb bag

Formula 707 MultiFly Feed-Thru Horse Fly Control, 10-lb bag

Rated 4.7 out of 5 stars
266
$65.99 Chewy Price
($6.60/lb)

Our ratings

Duration of Protection

4.3/5
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?

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
2
Tribute Equine Nutrition Equine Fly Control Block Horse Supplement, 30-lb block

Tribute Equine Nutrition Equine Fly Control Block Horse Supplement, 30-lb block

Rated 4.1 out of 5 stars
219
$35.79 Chewy Price
($1.20/lb)
Promo, Save 40% today with Autoship

Our ratings

Duration of Protection

4.1/5
Great

Ease of Use

4.2/5
Great

Effectiveness

4.0/5
Great

Ingredients

4.2/5
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
3
The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 2-lb bag
The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 2-lb bag
The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 2-lb bag

The Natural Vet Natural Horse Vet Bug Check Multi-Species Original Works from the Inside Out!, 2-lb bag

Rated 4.4 out of 5 stars
43
$38.95 Chewy Price
($0.61/serving)
Promo, New Customers Only: Spend $49+, get $20 eGift Card

Our ratings

Duration of Protection

4.4/5
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...
4
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
20
$69.95 Chewy Price
($0.31/serving)
Promo, New Customers Only: Spend $49+, get $20 eGift Card

Our ratings

Duration of Protection

4.4/5
Great

Ease of Use

3.9/5
Good

Effectiveness

4.1/5
Great

Ingredients

4.4/5
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
5
Nature's Helper Mediterranean Multi-Species Non-GMO Whole Black Oats, 3-lb bag
Nature's Helper Mediterranean Multi-Species Non-GMO Whole Black Oats, 3-lb bag
Nature's Helper Mediterranean Multi-Species Non-GMO Whole Black Oats, 3-lb bag
Nature's Helper Mediterranean Multi-Species Non-GMO Whole Black Oats, 3-lb bag

Nature's Helper Mediterranean Multi-Species Non-GMO Whole Black Oats, 3-lb bag

Rated 4 out of 5 stars
6
$19.99 Chewy Price
($6.67/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

4.7/5
Excellent

Is this fly supplement right for my pet?

Lifestage

All Lifestages, Adult

Top Ingredient

Whole Black Oats

Special Diet

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

Farm Animal Type

Cattle, Goat, Pig, Llama & Alpaca...
6
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)

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