6 Best Fly Supplements for Horses 2025: According to Reviews | Chewy

The 6 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
250
$109.99Chewy Price
($5.50/lb)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.5/5
Great

Ease of Use

4.7/5
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

Food Form

Supplement, Feed

Health Feature

Pest Control
2
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
107
$65.99Chewy Price
($6.60/lb)

Our ratings

Duration of Protection

4.2/5
Great

Ease of Use

4.5/5
Great

Effectiveness

4.5/5
Great

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)

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
35
$341.53Chewy Price
($0.54/serving)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.7/5
Excellent

Ease of Use

4.8/5
Excellent

Effectiveness

4.8/5
Excellent

Ingredients

4.7/5
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%

Food Form

Powder

Health Feature

Pest Control
4
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 4.3 out of 5 stars
26
$38.95Chewy Price
($0.61/serving)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.7/5
Excellent

Ease of Use

4.4/5
Great

Effectiveness

4.4/5
Great

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

Farm Animal Type

Cattle, Goat, Sheep, Llama & Alpaca...

Food Form

Supplement, Food Topping, Powder
5
AniMed Natural Garlic Powder Digestive Health & Pest Control Powder Horse Supplement, 2-lb tub
AniMed Natural Garlic Powder Digestive Health & Pest Control Powder Horse Supplement, 2-lb tub
AniMed Natural Garlic Powder Digestive Health & Pest Control Powder Horse Supplement, 2-lb tub
AniMed Natural Garlic Powder Digestive Health & Pest Control Powder Horse Supplement, 2-lb tub

AniMed Natural Garlic Powder Digestive Health & Pest Control Powder Horse Supplement, 2-lb tub

Rated 4.3 out of 5 stars
18
$23.99Chewy Price
($0.38/serving)
Promo, New Customers Only: Spend $49+, Get $20 eGift Card

Our ratings

Duration of Protection

4.6/5
Excellent

Ease of Use

4.2/5
Great

Effectiveness

4.4/5
Great

Ingredients

4.3/5
Great

Is this fly supplement right for my pet?

Lifestage

All Lifestages, Adult

Top Ingredients

Garlic, 100% Garlic

Food Flavor

Herbs & Spices

Food Form

Supplement
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
$239.95Chewy Price
($9.60/lb)
Promo, Save 40% on first Autoship w/ 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

Food Form

Pellets, Supplement

Health Feature

Pest Control