Comprehensive Guide to Horse Calming Supplements for Stress Relief

Last updated: April 28, 2025

By: Miles HenryFact Checked

If you’ve ever felt overwhelmed managing an excitable or anxious horse, you’re not alone. Stressful situations like traveling, vet visits, or competitions can challenge even seasoned horse owners.

Drawing from over 25 years of personal experience with Thoroughbreds and Quarter Horses, as well as extensive research and insights from professional trainers and equine studies, I created this guide to show you exactly how calming supplements, combined with good management and thoughtful training, can significantly reduce anxiety and improve your horse’s overall performance and well-being.

Why Do Horses Need Calming Supplements? Understanding Equine Stress

Horses have a strong “flight” instinct, making them naturally sensitive animals. This trait helps wild horses survive but often creates anxiety in domestic settings—particularly during transport, competitions, or changes in their routine. I’ve seen this firsthand with my racehorses and Quarter Horses, who sometimes struggle with these stressors despite proper training.

Calming supplements can significantly help manage these reactions, making them valuable tools for horse owners. However, supplements alone aren’t a complete solution—they should always be paired with a comprehensive approach that includes consistent training, proper nutrition, and careful environmental management.

In this article, I’ll guide you through the most effective supplement options and explain how to use them correctly for optimal results.

Types of Calming Supplements for Horses

Calming supplements typically fall into three main categories: herbal, nutritional, and pharmaceutical. For instance, studies have shown that alpha-casozepine, a protein derived from milk, has a calming effect in several species, including horses. Equus Magazine.

I’ve used nutritional and herbal supplements with my racehorses, observing varying degrees of success depending on each horse’s unique needs. The following table summarizes their key uses, benefits, and potential risks clearly and concisely:

Type of Supplement	Key Ingredients	When to Use	Benefits	Risks
Herbal	Chamomile, valerian root, passionflower	Mild anxiety (travel, new environments)	Natural, non-sedative	Variable effectiveness, potential allergies
Nutritional	Magnesium, L-Tryptophan, B vitamins	Chronic stress, daily maintenance	Supports neurotransmitter function	Possible imbalances if overused
Pharmaceutical	Acepromazine, prescription sedatives	Severe anxiety (vet visits, intense stress)	Effective in extreme cases	Sedation, vet supervision required

Explore more about L-tryptophan and learn more about horse nutrition here.

Equine CBD Supplements: Cannabidiol (CBD) has recently gained attention among horse owners for its potential calming effects. Anecdotal reports suggest it may help manage anxiety, reduce inflammation, and improve overall comfort. However, it’s important to choose quality products carefully, as the CBD market is still largely unregulated.

Always consult your veterinarian, especially if you compete, as many equestrian organizations restrict CBD use in competitions. (We’ll explore equine CBD in greater detail in an upcoming article.)

Pro Tip: Always consult your veterinarian before starting any supplement. A vet can recommend the safest and most effective choice based on your horse’s individual needs.

Now that you understand the different calming supplements available let’s look at real-life examples showing how they effectively manage equine anxiety.

How I’ve Used Calming Supplements to Manage Equine Anxiety

Over the years, I’ve seen firsthand how targeted supplements, combined with a holistic care plan, can effectively manage equine anxiety. Here are a few real-life examples from my barn:

Travel Anxiety
One of my Quarter Horses, whom I regularly hauled to barrel races, became visibly nervous during trips. Administering a magnesium-based calming supplement an hour before loading, wrapping his legs for comfort, and providing hay in a familiar net eased his stress, making travel noticeably smoother and safer. Learn practical tips to manage travel stress here.

Farrier Visits
My mare, Belle, would become anxious during shoeing, kicking or pulling away from the farrier. An herbal calming supplement given about an hour before the farrier’s arrival significantly improved the experience. It reduced her anxiety, helping her remain calm and cooperative, making the process safer for everyone involved.

Noise Sensitivity at Events
One of my Thoroughbreds, Corked, often became jittery at races, distracted by loudspeakers and cheering crowds. A nutritional calming supplement containing L-Tryptophan helped him relax, improving his focus in the warm-up area and responsiveness during the race. After consulting my veterinarian about appropriate dosages, I saw a noticeable improvement in his race-day demeanor and performance.

First Turnout in a New Paddock
After moving to a new facility, my two-year-old filly, Little Millie, showed signs of stress during her first turnout, pacing and calling out repeatedly. To ease this transition, I gave her a small dose of an herbal calming supplement with chamomile and passionflower an hour before turnout. The supplement gently reduced her anxiety, helping her calmly explore and settle into her new environment.

These experiences reinforce that calming supplements are useful tools when combined with proper training and care, never a substitute for either. For additional mental conditioning tips, see my article: Mental Conditioning for Competitive Horses.

Choosing the Right Calming Supplement for Your Horse’s Needs

Selecting the right calming supplement for your horse can feel overwhelming. To simplify your decision, here are key points to consider:

• Understand Your Horse’s Needs:
  Identify whether your horse experiences situational anxiety (e.g., during travel or competitions) or chronic stress. Quick-acting pastes often help situational anxiety, while daily powders or pellets work better for ongoing stress.
• Check the Ingredients:
  Look for proven calming ingredients like magnesium, L-Tryptophan, or targeted herbal blends based on your horse’s behavior and dietary sensitivities.
• Verify Quality Standards (NASC Seal):
  Choose products displaying the NASC (National Animal Supplement Council) Quality Seal. This ensures the supplement has passed rigorous quality checks and meets stringent manufacturing and safety guidelines.
• Consult Your Veterinarian:
  Your vet can recommend the best supplement, considering your horse’s specific weight, age, health, and situation, ensuring safety and optimal results.

Recent research also highlights that supplements containing citrus botanical oils, magnesium, and yeast effectively reduce cortisol levels, helping horses better manage stress during events like trailering. Explore the research here.

My Experience: When hauling our two Quarter Horses to Fort Worth for a barrel racing event, we used a magnesium-based calming supplement recommended by our veterinarian. Choosing a product marked with the NASC seal gave me peace of mind about its safety and effectiveness. The results were noticeable—both horses traveled calmly, arrived relaxed, and performed better at the event, reinforcing the value of carefully selected calming supplements.

By carefully considering these factors, you’ll select a supplement tailored precisely to your horse’s unique needs, maximizing safety and effectiveness.

Key Ingredients in Horse Calming Supplements: How They Ease Stress

Understanding the key ingredients in calming supplements can help you select the right option for your horse’s specific needs. For example, magnesium has been reported in various studies to have a positive calming effect. ​Dodson Horrell Here’s what stands out:

1. Magnesium:
   Supports nerve function and relaxes muscles. It’s ideal for horses with chronic stress or muscle tension.
2. L-Tryptophan:
   An amino acid that boosts serotonin levels to promote calmness. A study in the Journal of Animal Science highlights its effectiveness in reducing stress-related behaviors, making it an excellent choice for pre-event anxiety.
3. Herbal Blends:
   Natural ingredients like chamomile and valerian root are effective for mild anxiety. They are best for horses adjusting to new environments or sensitive to noise, though results can vary.

Note: Always check competition regulations before using supplements, as some ingredients may be restricted in certain disciplines.

Diet and Forage: The Key to Supporting Horse Calming Supplements

A healthy horse begins with a balanced diet. Calming supplements can support your horse, but they work best when paired with proper nutrition. Here’s how to lay the foundation:

High-Quality Hay:

Ensure your horse’s hay is free from mold, dust, and weeds. Good hay should have a fresh smell, green color, and a soft texture. Testing for nutrient content can help identify deficiencies and ensure your horse gets what it needs. I’ve had hay tested for my racehorses to ensure their diets meet performance demands, and the results helped me balance their nutrition effectively. Learn how to evaluate hay quality here.

Consistent Access to Forage:

Forage isn’t just about nutrition—it keeps your horse’s digestive system healthy and prevents stress-related conditions like ulcers. Grazing also mimics natural behavior, keeping your horse mentally and emotionally calm.

Balanced Nutritional Intake:

A well-fed horse is less likely to exhibit behavioral issues caused by nutrient deficiencies. For example, a horse lacking magnesium might show signs of nervousness, which can be addressed through diet and supplements.

Note: Introduce dietary changes gradually, as sudden shifts can upset digestion, increasing stress and anxiety.

Pro Tip: Monitor your horse’s weight and coat condition to ensure their diet meets their needs. If you notice changes, consult a veterinarian or equine nutritionist to adjust their feeding plan.

Using Calming Supplements Effectively: Tips for Horse Owners

Calming supplements come in various forms, each with its own benefits and drawbacks. The table below details the benefits, drawbacks, and best use cases for powders, pastes, and pellets, making it easy to choose the right form for your horse.

Form	Benefits	Drawbacks	Best Use
Powders	Easy to mix into feed; ideal for daily use	May be avoided by picky eaters; can settle in feed if not mixed thoroughly	Regular maintenance and chronic anxiety
Pastes	Pre-measured and portable; easy to administer	Can be messy; requires direct handling; may be hard to dose if the horse resists	Travel or immediate stress situations
Pellets	Palatable; blend well with regular feed	Slower onset of effects; less suitable for immediate stress; not ideal for horses with dental issues	Horses sensitive to powdered supplements

Dosage Guidelines

Proper dosing ensures the supplement effectively reduces stress without causing unwanted side effects. Incorrect dosages may lead to ineffective stress management or potential health risks. The recommended dosage depends on factors such as your horse’s weight, age, and the stress level of the situation. For example:

• Magnesium-based supplements: Suggested at 5–10 grams per day for a 1,000-pound horse.
• L-Tryptophan: Typically ranges between 1–2 grams per dose, depending on the product.

Key Tips for Dosage:

1. Start Small: Introduce a smaller dose to gauge your horse’s response before reaching the recommended amount.
2. Consult Your Veterinarian: Always tailor dosages to your horse’s specific needs, especially for unique health conditions or sensitivities.
3. Timing: Administer supplements at least 30 minutes to an hour before the stressful event for maximum effectiveness.

Pro Tip: Always introduce new supplements gradually and watch your horse for any adverse reactions. Consulting with a veterinarian can ensure the chosen supplement aligns with your horse’s health needs.

Understanding Side Effects and Risks of Calming Supplements for Horses

While calming supplements are generally safe, they may cause side effects like drowsiness, digestive upset, or allergic reactions. It’s important to note that while many horse trainers and owners report improvements, there is little research in the equine world to prove or disprove the effects of calming supplements.

Over-sedation can impair focus, while ingredient sensitivities could lead to colic or irritation. Always consult your veterinarian and introduce supplements gradually to monitor for adverse reactions.

How to Reduce Risks:

• Start Slowly: Introduce new supplements gradually to monitor your horse’s response.
• Track Symptoms: Keep a journal of your horse’s behavior, diet, and any noticeable changes after starting a supplement.
• Consult Your Vet: Your veterinarian can assess your horse’s overall health and recommend the safest and most effective options. For example, they might suggest bloodwork to check nutrient levels before introducing a new supplement.

By staying vigilant and working closely with your vet, you can ensure that calming supplements enhance your horse’s well-being without unintended consequences. While supplements can address immediate stress, they work best when integrated into a broader care plan. Let’s explore additional calming strategies to help manage your horse’s stress and boost its confidence.

Consulting with my veterinarian before administering calming supplements has prevented potential issues—such as avoiding valerian root due to competition regulations.

Holistic Strategies to Keep Your Horse Calm and Confident

Calming supplements are most effective when paired with a comprehensive care plan. By addressing a horse’s physical and mental needs, you can create a calm, confident partner. Here are key strategies to incorporate into your routine:

1. Training Techniques:
   Desensitization and positive reinforcement build confidence and reduce anxiety. For example, I had a horse that would spook at tarps. Using gradual desensitization, I introduced the tarp in a safe environment, rewarding calm behavior. Over time, his responses improved significantly. Pairing this process with a calming supplement can help take the edge off initial anxiety, allowing your horse to focus better during training.
   Explore training techniques here.
2. Environmental Management:
   A secure, consistent environment minimizes stress. Loud machinery, sudden weather changes, or other disruptions can unsettle horses. Reducing such triggers, combined with calming supplements, helps create a stable, relaxing space.
3. Routine and Consistency:
   Horses thrive on predictability. Feeding, turnout, and exercise schedules should remain steady to help your horse feel secure. Incorporating a supplement during transitions, such as the start of a busy competition season, can provide extra support while maintaining their routine.
4. Regular Exercise:
   Physical activity channels nervous energy and maintains mental health. For example, lunging a horse before trailering can release excess energy, making travel less stressful. While exercise plays a significant role, a calming supplement can complement these efforts, particularly for horses prone to overreacting in new settings.

Pro Tip: Try pairing a calming supplement with desensitization training or a new routine to help your horse adjust more smoothly. Supplements can take the edge off anxiety, allowing these strategies to work more effectively. Discussing these holistic strategies with a professional trainer or veterinarian has always ensured the best outcomes for my horses, particularly when integrating new supplements into their routines.

FAQs: Answering Common Questions About Horse Calming Supplements

Final Thoughts: Key Takeaways on Calming Supplements for Horses

Calming supplements can transform the way you manage your horse’s anxiety, but they’re just one piece of the puzzle. Pairing supplements with a balanced diet, consistent training, and a supportive environment is essential for long-term success.

Key Takeaways: Managing Horse Anxiety with Calming Supplements

• Consult a veterinarian: Always discuss supplement options with your vet to ensure safety and effectiveness.
• Choose the right type: Herbal supplements for mild anxiety, nutritional for chronic stress, and pharmaceuticals for severe cases.
• Combine with holistic care: Supplements work best alongside training, nutrition, and consistent routines.
• Monitor your horse: Observe changes in behavior and adjust dosages as needed.
• Look for quality assurance: Opt for products with the NASC Quality Seal to ensure safety and reliability.
• Start gradually: Introduce supplements slowly to gauge your horse’s response and reduce the risk of adverse effects.

For horse owners exploring alternative options, CBD is also gaining attention—learn more in my full guide: Is Equine CBD Helpful For Competitive Horses?.

Your Turn: Combining calming supplements with consistent training dramatically improved my horses’ performance and well-being. Have you tried calming supplements? What worked (or didn’t work) for your horse? Share your experiences or questions in the comments to help others in the community!