Home Remedies For Horse Asthma: Practical, Drug‑Free Support Strategies

Horse asthma can quietly steal performance long before you see a full‑blown heaves episode. You might notice a little cough at the trot, a bit more nostril flare after a hill, or that your normally forward horse now “runs out of gas” sooner. You want to help, without jumping straight to heavy drugs or risking a positive test in competition.

That’s exactly where thoughtful, evidence‑informed home remedies fit. They don’t replace your veterinarian or inhaled medications when those are truly needed, but they can dramatically reduce airway irritation, support lung function, and protect the hindgut that powers your horse’s entire system.

As an equine holistic veterinarian, I’ll walk you through practical, barn‑ready strategies: from cleaner air and smarter hay preparation to herbal and nutritional support that respects both your horse’s lungs and their delicate hindgut. You’ll also see clear guidance on dosing (1,000 lb horse vs. ponies/minis), competition rules, and red‑flag signs when “home care” is no longer enough.

Understanding Horse Asthma And Why “Home Remedies” Matter

What Is Equine Asthma, Heaves, RAO, And IAD?

Equine asthma is an umbrella term that includes:

Heaves / Recurrent Airway Obstruction (RAO) – often triggered by dusty hay and stable environments: classically seen in older horses.
Inflammatory Airway Disease (IAD) – typically affects younger performance horses with subtle exercise intolerance and occasional coughing.

In all of these, your horse’s lower airways are chronically inflamed and hypersensitive. Inhaled dust, mold spores, ammonia, and pollen trigger bronchoconstriction (airway tightening) and mucus production. Over time, the lungs remodel and it becomes harder for the horse to move air in and out.

You’ll often hear a few overlapping terms:

“Heaves” – the traditional name, referring to the visible heave line from abdominal effort to breathe.
RAO (Recurrent Airway Obstruction) – older terminology for heaves.
IAD (Inflammatory Airway Disease) – milder, often intermittent asthma.
Equine Asthma – current preferred, inclusive term.

None of these are “simple allergies.” They’re chronic conditions you manage, not cure outright.

How Environmental Triggers Affect Performance And Longevity

Every breath your horse takes brings in tiny particles. In a natural, low‑dust pasture environment, their respiratory system handles that load well. In a typical barn, especially with dry hay and straw, particle counts can be many times higher.

Over years, this constant irritation:

Lowers oxygen delivery to muscles.
Increases effort of breathing (they’re “working” even at rest).
Alters biomechanics (more abdominal effort, tighter back, shorter stride).
Can predispose to secondary infections.

That means:

Less stamina and slower recovery after work.
Reduced performance in any sport that requires sustained aerobic effort.
Earlier retirement if the airway remodeling becomes severe.

This is why home remedies matter. Thoughtful management and natural support can:

Reduce dust and allergen exposure.
Quiet airway inflammation enough to lower the need for systemic drugs.
Protect overall health, including the hindgut, which is often the silent victim when you reach for harsh medications or high‑starch feeds to keep weight on a struggling horse.

Your goal is a forage‑based, low‑dust lifestyle that helps the lungs and the gut work together, not fight each other.

Recognizing Early Signs Your Horse Is Struggling To Breathe

Mild, Moderate, And Severe Signs To Watch For

You’ll catch and manage equine asthma far more effectively if you watch for early, subtle changes instead of waiting for a crisis.

Mild signs (often missed or dismissed):

Occasional cough at the beginning of exercise.
Mild nasal discharge, usually clear or white.
Slight decrease in performance or willingness to go forward.
Louder breathing noises during canter or after a hill.

Moderate signs:

Frequent coughing, including at rest or while eating hay.
Noticeable nostril flare with light work.
Increased respiratory rate at rest (more than ~16–20 breaths/min in a calm adult).
Visible abdominal push on exhale.

Severe signs (urgent):

Standing with legs braced, obvious heave line.
Marked nostril flare and anxious expression.
Breathing so hard you can see the ribcage and flanks pumping.
Refusal to move forward or sudden drop in performance.

These severe signs can evolve into respiratory distress, a true emergency.

When Coughing Is An Emergency

A single cough at the start of a ride isn’t an emergency. But you should call your veterinarian promptly if you see:

Persistent coughing at rest.
Coughing combined with fever, depression, or loss of appetite.
Coughing that’s so intense the horse appears distressed or almost collapses.
Any cough combined with rapid, labored breathing or blue‑tinged gums.

Don’t try to “treat at home” if your horse is in visible respiratory distress. Asthma can spiral into life‑threatening status asthmaticus. Your vet may need to provide oxygen, bronchodilators, and possibly corticosteroids.

Colic warning: Severe respiratory effort, anxiety, and feed changes (like suddenly soaking or steaming all hay) can also stress the hindgut. If, on top of breathing issues, you notice colic signs, pawing, repeated looking at the flank, rolling, lack of manure, or a tight, painful abdomen, contact your vet immediately. Home remedies are only appropriate for a horse that’s otherwise bright, eating, drinking, and passing normal manure.

Creating Cleaner Air: Stable And Pasture Management Changes

Ventilation, Airflow, And Dust Control In The Barn

Your most powerful “home remedy” for horse asthma is the air your horse breathes, every minute of every day.

Remedy 1: Maximize barn ventilation

What to do:
Keep top doors and windows open whenever weather allows.
Use safe, well‑placed fans to move air across stalls, not directly into eyes or noses.
Avoid sweeping or blowing dust around when horses are inside, use a damp broom or lightly mist aisles first.
Why it works: Better airflow lowers concentration of dust, mold, and ammonia so every breath carries fewer irritants into the lower airways.
Hindgut connection: Stressful, stuffy environments raise cortisol and can disrupt hindgut motility. A calmer, fresher barn helps your horse stay relaxed enough to eat and ferment forage normally.

Remedy 2: Wet down high‑dust areas

Preparation: Fill a watering can or hose with a fine spray nozzle.
Instructions: Lightly dampen aisles and dry dirt areas before sweeping or moving hay.
Frequency: Daily in dry weather or whenever dust is obvious.
Safety: Don’t flood: you’re binding dust, not creating slick surfaces.

Pasture Management For Sensitive Lungs

Pasture turnout is often the single biggest environmental change you can make.

Remedy 3: Maximize turnout in suitable pasture

Aim for as many hours outside as your setup safely allows.
Turn the horse out during stall cleaning, hay moving, and sweeping.
In summer asthma, some horses react more to pollen: for these horses, night turnout or turnout during lower‑pollen hours can help.

Remedy 4: Avoid round bales in shelters

Round bales trap enormous amounts of dust and mold. A horse with their nose buried in one is inhaling a constant stream of irritants.

Replace round bales with:
Steamed or soaked small‑square bales.
Low‑dust hay pellets or cubes fed from ground‑level tubs.

Again, changing the forage form (how it’s presented) supports both the lungs and the hindgut: you keep forage fiber available while dramatically lowering airborne particles.

Bedding Choices: What To Avoid And What To Use Instead

Remedy 5: Switch from straw to low‑dust bedding

Avoid:
Straw (especially damp or moldy).
Poor‑quality sawdust.
Prefer:
Kiln‑dried wood shavings labeled “low dust.”
Paper or cardboard bedding.
Peat moss in some climates.

How to change bedding safely (hindgut and colic caution):

A stressed, coughing horse may spend more time standing and less time moving, which already slows gut motility. If you move from straw (which some horses nibble) to a non‑edible bedding overnight, you’re also changing the effective fiber intake.

To minimize colic risk:

Increase forage availability when you remove edible bedding.
Make any big bedding change at a time when you can monitor manure closely.
Watch for colic signs: decreased manure, dry or very loose manure, pawing, flank‑watching, or rolling.

Low‑Dust Feeding Strategies To Reduce Airway Irritation

Hay Quality, Steaming, And Soaking Options

The hay you feed is one of the main levers you control for a horse with asthma.

Remedy 6: Feed only clean, low‑mold hay

Choose hay that’s:
Green‑to‑light gold, not gray.
Smells fresh: no musty or moldy odor.
Free of visible mold or heavy dust when shaken lightly.

Avoiding mold protects both lungs and hindgut: moldy forage disrupts the microbial population in the large colon and can trigger colic or diarrhea.

Remedy 7: Steamed hay

Preparation: Use a commercial hay steamer or a safe DIY setup designed for horses.
Goal temperature: At least 100°C (212°F) in the hay core for 10+ minutes to kill mold and bind dust.
Feeding: Allow hay to cool, then feed within 12–24 hours to avoid spoilage.
Dosage:
1,000 lb horse: typically 1.5–2% bodyweight in forage per day (15–20 lb dry hay equivalent), all of it steamed if possible.
Ponies/minis (250–500 lb): 1.5–2% bodyweight (4–10 lb), adjust for body condition.

Remedy 8: Soaked hay (if you can’t steam)

Preparation:
Submerge hay in clean, cool water for 10–30 minutes to bind dust.
Drain thoroughly before feeding.
Pros: Reduces respirable dust and some sugars.
Cons: Leaches nutrients and can ferment if left too long.
Hindgut note: Because soaking removes some soluble carbohydrates, it may actually help overweight, metabolically sensitive horses. Just don’t suddenly switch all hay to soaked overnight: transition over 3–5 days and monitor manure for changes.

Feeding From The Ground And Adjusting Meal Types

Remedy 9: Ground‑level feeding systems

Horses with asthma breathe easier when eating with their heads down: this supports natural mucus drainage.

Use large, clean tubs or low slow‑feeders at ground level.
Avoid high hay nets that encourage inhaling falling dust.

This more natural posture also supports jaw alignment and chewing efficiency, which benefits hindgut fermentation by improving particle size of swallowed forage.

Remedy 10: Switch part of the ration to soaked hay pellets or cubes

Preparation:
Soak hay pellets or cubes in warm water until fully soft (usually 10–30 minutes).
Aim for a “damp mash” consistency, no hard centers.
Dosage (per day):
1,000 lb horse: Replace up to 50–100% of long‑stem hay with soaked pellets/cubes as needed, keeping total forage 15–20 lb/day.
Ponies/minis: 3–8 lb/day total forage (pellets + any hay), adjusted to body condition.
Colic warning: Never feed dry cubes or pellets to an older horse with poor teeth or any horse that tends to bolt feed: they can swell in the esophagus and cause choke. Always introduce soaked forage gradually over 3–5 days and monitor for gas, reduced manure, or signs of abdominal pain.

Managing Weight, Metabolism, And Gut Health

Asthmatic horses often lose weight due to increased work of breathing, or gain weight if turnout and exercise are reduced. Either extreme stresses the hindgut.

Remedy 11: Forage‑first, low‑starch diet

Base the diet on high‑quality forage, not high‑starch concentrates.
If extra calories are needed, add:
Soaked beet pulp (no molasses) – fiber that ferments in the hindgut.
Stabilized ground flax for calories and omega‑3s.

Dosage guidelines:

Beet pulp (dry weight):
1,000 lb horse: 0.5–2 lb/day, soaked thoroughly.
Ponies/minis: 0.25–0.75 lb/day, soaked.
Flax (see also Remedy 13 under supplements):
1,000 lb horse: start at ½ cup (about 60 g) and work up.
Ponies/minis: 1–3 Tbsp/day.

Hindgut emphasis:

A steady supply of fermentable fiber keeps the cecal and colonic microbes healthy. These microbes produce volatile fatty acids that fuel the respiratory muscles, helping your horse breathe and perform. Abrupt diet changes, heavy grain meals, or sudden removal of forage can upset this ecosystem and lead to gas colic or, in worst cases, displaced or twisted bowel (surgical colic). Always adjust feeds gradually over several days and watch manure closely.

Natural Support Options: Herbs, Supplements, And Breathing Aids

This is where many people start, but it should actually follow environmental and feeding changes. Herbs won’t out‑perform a dusty hayloft.

Below are home remedies that can support airway comfort and immune balance. For each, you’ll see preparation, dosing, competition considerations, and a note on the hindgut.

Important competition note: Some herbs used for respiratory or calming support, like valerian and devil’s claw, are prohibited by USEF/FEI. Always check current rules and your product labels. When in doubt, stop any herbal product 7–10 days before competition and verify with your vet or federation.

Commonly Used Herbs And Their Evidence Limits

Herbal evidence in horses is limited: most data are from lab animals or human studies. You’re using them as support, not cure.

Remedy 12: Spirulina (blue‑green algae)

Why: May modulate immune responses and help some allergy‑prone horses, including those with equine asthma.
Form: Powdered spirulina platensis.
Dosing:
1,000 lb horse: 20 g twice daily (about 2 slightly rounded Tbsp, depending on product density).
Ponies/minis: 5–10 g twice daily.
Preparation:
Mix the powder into a damp, forage‑based mash (e.g., soaked hay pellets).
Competition rules: Spirulina is not currently listed as a banned substance by USEF/FEI, but always check your specific federation.
Hindgut caution: Introduce over 5–7 days. Any new feed additive can temporarily alter hindgut flora: monitor manure and appetite.
Safety: Avoid in pregnant mares or horses on certain medications (e.g., some NSAIDs) unless your vet approves, due to limited safety data.

Remedy 13: Jiaogulan (Gynostemma pentaphyllum)

Why: Used to support circulation and, anecdotally, respiratory function in horses with heaves.
Form: Dried cut herb or powder.
Dosing:
1,000 lb horse: 2–4 g twice daily.
Ponies/minis: 0.5–1 g twice daily.
Preparation:
Mix into damp feed. For sensitive horses, you can make a tea (steep in hot water 10–15 minutes, cool, then pour over feed).
Competition rules: Not specifically listed as banned at the time of writing, but because data are sparse, discontinue at least 7 days before competition unless your vet confirms compliance.
Hindgut: Very small doses relative to total forage, so risk is low if introduced gradually.

Remedy 14: Mullein and thyme tea top‑dressing

Why: Traditional herbs for soothing airways and supporting mucus clearance.
Preparation:
Add 1–2 Tbsp dried mullein leaf and 1–2 tsp dried thyme to 2 cups of boiling water.
Steep 10–15 minutes, strain, cool.
Pour over a portion of your horse’s soaked forage.
Dosing:
1,000 lb horse: full 2 cups tea once or twice daily.
Ponies/minis: ½–1 cup once or twice daily.
Competition rules: Generally not banned, but thyme oil in concentrated form could raise questions. Stick to mild, food‑grade dried herbs.
Hindgut note: This is mostly water with a small amount of herbal extract: unlikely to disturb hindgut if feed changes are otherwise stable.

Remedy 15: Anise or fennel seeds for cough relief

Why: Traditionally used as gentle expectorants and carminatives (gas‑relieving), which can help both lungs and gut.
Preparation:
Lightly crush whole seeds just before feeding to release volatile oils.
Dosing:
1,000 lb horse: 1–2 tsp crushed seeds once or twice daily.
Ponies/minis: ¼–½ tsp once or twice daily.
Competition rules: Not listed as banned, and used in some commercial feeds.
Hindgut tie‑in: These herbs have mild carminative effects and may actually help relieve mild gas. They are not a treatment for serious or surgical colic. If you see persistent pain, lack of manure, or repeated rolling, call your vet, don’t keep “treating gas” at home.

Remedy 16: Licorice root (deglycyrrhizinated preferred)

Why: Soothes mucous membranes: can support both the upper airway and gastric lining.
Form: Powdered root, ideally DGL (deglycyrrhizinated) to reduce effects on blood pressure and electrolytes.
Dosing:
1,000 lb horse: 5–10 g twice daily, short term (2–4 weeks).
Ponies/minis: 2–4 g twice daily.
Preparation: Mix into soaked feed: it has a sweet taste many horses accept.
Competition rules: Not currently banned, but high doses over long periods can theoretically influence cortisol testing: stop 3–5 days pre‑show to be conservative.
Hindgut: Often used supportively in ulcer programs: still, add gradually and avoid in horses with hypertension or serious liver disease without vet guidance.

Supportive Supplements: Omega‑3s, Antioxidants, And More

Remedy 17: Ground flaxseed (omega‑3 support)

Why: Omega‑3 fatty acids can help modulate inflammation, including respiratory inflammation, and support healthy skin and hooves.
Form: Stabilized, ground flax or flax oil.
Dosing (ground flax):
1,000 lb horse: 4–8 oz/day (approx. 1–2 cups), split between meals.
Ponies/minis: 1–4 oz/day (¼–1 cup).
Preparation:
Mix into soaked forage or low‑starch mash.
Competition rules: Flax is allowed.
Hindgut note: Flax is calorie‑dense: increase slowly over 7–10 days to avoid loose manure.

Remedy 18: DHA‑rich omega‑3 (algae or fish oil)

Why: DHA (docosahexaenoic acid) seems particularly helpful in some studies on equine airway inflammation.
Dosing (as DHA):
1,000 lb horse: 10–30 g DHA/day depending on product and vet recommendation.
Ponies/minis: proportionally lower, often 5–10 g/day.
Preparation:
Mix oil or DHA‑fortified supplement into soaked feed.
Competition rules: Generally permitted: verify ingredients for any added herbs.
Hindgut: Fats don’t ferment in the hindgut, so they can provide safe extra calories. Introduce slowly: excessive fat too quickly can soften manure.

Remedy 19: Plain salt and balanced electrolytes

Why: Adequate hydration keeps mucus thinner and easier to clear from the airways.
Dosing (plain salt, plus to free‑choice mineral block):
1,000 lb horse: 1–2 Tbsp/day mixed in feed, more in hot weather or heavy work.
Ponies/minis: ½–1 tsp/day, adjusted for size and sweat.
Hindgut: Salt encourages drinking, which supports normal gut motility and reduces impaction colic risk.

Safe Use, Dosing, And When To Stop A Supplement

Whenever you add a home remedy:

Change one thing at a time and give it 10–14 days so you can tell what helped.
Start low and go slow, especially in ponies and minis, they’re more sensitive by bodyweight.
Stop immediately and call your vet if you see:

Diarrhea, no manure, or obvious colic signs.
Swelling, hives, or other allergic reactions.
Worsening cough or breathing difficulty.

And remember: if your horse competes, avoid herbs like valerian and devil’s claw, which are specifically banned by USEF/FEI. Some calming or “herbal bute” blends contain these: read labels carefully. Your goal is a low‑drug, not a secretly‑drugged, horse.

Training, Turnout, And Conditioning For Asthmatic Horses

Warm‑Up, Cool‑Down, And Exercise Intensity Guidelines

Lungs, muscles, and hindgut all respond better to work that ramps up and down gradually.

Remedy 20: Structured warm‑up and cool‑down

Warm‑up (10–20 minutes):
Start with 5–10 minutes of loose walk on a long rein.
Add gentle bending and large circles at the walk, then easy trot.
Avoid abrupt transitions to canter or maximal effort.
Cool‑down (10–15 minutes):
Gradually step back down from canter to trot to walk.
Keep walking until breathing rate is near normal and nostril flare subsides.

This pacing reduces sudden airway strain and gives the cardiovascular system and hindgut time to adapt. Sudden maximal efforts in a horse that just ate can compromise blood flow to the intestines and raise colic risk.

Remedy 21: Train on better air days

On very dusty, high‑pollen, or high‑ozone days, lighten the workload:
Focus on walking hill work, in‑hand exercises, or arena basics with lower intensity.
If you have an indoor, ride when footing is freshly watered.

Seasonal Adjustments To Workload And Housing

Asthmatic horses often have seasonal patterns:

Some are worse in winter (closed barns, dry hay). For these, prioritize turnout and low‑dust hay.
Others are worse in summer (pollen and heat). Night turnout, fans, and avoiding midday heat can help.

Remedy 22: Adjust expectations, not just medications

During the horse’s “bad season,” scale back:
Peak intensity workouts.
Back‑to‑back show weekends.
Use that time for:
Low‑stress conditioning.
Skill work at lower heart rates.

This balances respiratory load with overall fitness, and it avoids pushing a horse who can’t adequately oxygenate muscles, or the gut, under high stress. A chronically over‑pushed, under‑oxygenated horse is at higher risk for both respiratory crises and stress‑related colic.

Monitoring Progress And Knowing When Home Care Is Not Enough

Tracking Symptoms, Triggers, And Response To Changes

You’ll get far more out of home remedies if you track what you’re doing and what you observe.

Remedy 23: Create a simple asthma log

Each day, jot down:

Cough frequency (none, mild, frequent).
Nasal discharge (none, clear, cloudy, colored).
Resting respiratory rate.
Workload (light, moderate, hard).
Environment (indoor/outdoor, dusty, pollen count if known).
Any new feed or supplement changes.

Over a few weeks, patterns emerge: maybe soaked hay makes a big difference, or certain bedding worsens signs. This log also helps your vet fine‑tune a low‑drug plan.

Red‑Flag Signs That Require A Veterinarian

Stop “home remedy experiments” and call your vet promptly if you see:

Marked increase in coughing or respiratory rate.
Horse using abdominal muscles heavily to breathe at rest.
Flared nostrils and anxious stance.
Blue or gray‑tinged gums or tongue.
Fever, lethargy, or loss of appetite alongside respiratory signs.
Any colic signs: no manure for 6–8 hours, repeated rolling, inability to settle, tight belly, or severe gas distention.

Remember: Home remedies are designed for stable, mild‑to‑moderate asthma in a horse that is otherwise bright, eating, and passing normal manure. A horse in distress, or a horse with respiratory signs plus abdominal pain, needs immediate veterinary care.

Working With Your Vet On A Low‑Drug, Long‑Term Plan

A good equine asthma plan often combines:

Environmental management (your home remedies).
Forage‑first nutrition that protects the hindgut.
Targeted medications when needed, ideally inhaled steroids and bronchodilators that minimize systemic effects.

You can ask your vet specifically for a low‑drug strategy, such as:

Using inhaled medications during flares, then tapering as environmental control and natural support improve.
Reserving systemic steroids for true crises.
Checking for hidden issues (like gastric ulcers, hindgut dysfunction, or metabolic disease) that may worsen respiratory signs.

The goal isn’t to avoid all drugs at any cost: it’s to use the minimum necessary, supported by thoughtful, holistic home care that respects your horse’s lungs, gut, and long‑term soundness.

Conclusion

Equine asthma doesn’t have to end your horse’s performance career, or their joy in work. When you focus on what your horse breathes and what you put in their feed tub, you create the foundation for healthier airways and a more resilient hindgut.

You’ve seen how practical home remedies fit together:

Cleaner air from better ventilation, turnout, and bedding.
Low‑dust, forage‑based feeding through steaming, soaking, and ground‑level systems.
Thoughtful use of natural supports like spirulina, jiaogulan, mullein, thyme, flax, and DHA.
Smart training and seasonal adjustments that respect your horse’s limits.
Careful monitoring so you know when to change course, or call your vet.

Every one of these strategies acknowledges your horse as a hindgut fermenter whose lungs, gut, and nervous system are deeply interconnected. When you reduce irritants and feed the microbiome well, you give your horse a better chance to breathe freely, move willingly, and stay in work longer, without leaning on heavy drugs or risking banned substances.

Start with the basics you can control today: cleaner air, cleaner hay, more turnout. Then, layer in one or two carefully chosen home remedies and track the results. With time, patience, and a good partnership with your veterinarian, your horse with asthma can still have a long, useful, and comfortable life under saddle.

Frequently Asked Questions

What are the most effective home remedies for horse asthma?

The most effective home remedies for horse asthma focus on environment and forage: maximize turnout, improve barn ventilation, switch from straw to low‑dust bedding, feed only clean low‑mold hay (steamed or soaked), and use ground‑level feeders. These reduce inhaled dust and mold, often lowering the need for systemic medications.

How can I safely soak or steam hay for a horse with asthma?

For steaming, use a commercial steamer and ensure hay reaches about 212°F (100°C) in the core for at least 10 minutes, then cool and feed within 12–24 hours. For soaking, submerge hay in clean, cool water for 10–30 minutes, drain thoroughly, and transition gradually over 3–5 days.

Which natural supplements help support a horse with equine asthma at home?

Common natural supports for equine asthma include spirulina, jiaogulan, mullein and thyme tea, anise or fennel seeds, licorice root, ground flaxseed, and DHA‑rich omega‑3s. Introduce one at a time, start with low doses, mix into soaked forage, and stop immediately if you see diarrhea, colic signs, or worsening breathing.

Can home remedies for horse asthma replace veterinary treatment?

No. Home remedies for horse asthma are best used alongside veterinary care, not instead of it. Environmental and dietary changes can significantly reduce airway irritation, but any horse with rapid, labored breathing, persistent coughing at rest, fever, blue‑tinged gums, or colic signs needs prompt veterinary assessment and possibly prescription medications.

What is the best way to exercise a horse with asthma or heaves?

Use gradual warm‑ups (10–20 minutes of walking and easy trot), avoid sudden intense efforts, and allow a long cool‑down until breathing normalizes. On dusty or high‑pollen days, reduce intensity or work in better air. Adjust workload seasonally and avoid back‑to‑back hard workouts during the horse’s “bad” season.

Are herbal remedies for horse asthma legal in competition?

Many simple herbs (like mullein, thyme, fennel, or flax) are allowed, but some commonly used for pain or calming—such as valerian or devil’s claw—are prohibited by USEF and FEI. Always check your federation’s current rules, read labels carefully, and discontinue questionable herbal products 7–10 days before competing.