Reducing Cortisol in Horses

The number of horses suffering from Cushing’s disease, Equine Recurrent Uveitis, insulin resistance, or chronic laminitis is steadily increasing. All of these conditions share a common factor: they are closely linked to stress and the stress hormone cortisol. If you want to safeguard your horse’s long-term health, it is crucial to understand how cortisol works, what chronic stress does to the equine body – and most importantly, how to reduce cortisol in horses.

Cortisol is a hormone produced in the adrenal glands. It plays a key role in the body’s stress response. Through the so-called HPA axis (hypothalamic-pituitary-adrenal axis), cortisol is released whenever a horse experiences stress.

The effects of cortisol in the body are manifold:

• Raises blood sugar levels to provide quick energy.

• Increases muscle tension to enable escape.

• Suppresses inflammation (temporarily protective).

• Reduces blood flow to minimize blood loss in case of injury.

Cortisol is not inherently “bad.” It becomes problematic when the horse is under chronic stress and cortisol levels remain persistently high.

As a prey animal, the horse is naturally wired to respond to danger with flight. Heart rate, blood pressure, and muscle tension rise, cortisol is released – and after successful escape, the body calms down again. The parasympathetic nervous system takes over, allowing digestion and regeneration to resume.

If stress becomes constant, the body enters a state of permanent tension. Cortisol is secreted continuously at elevated levels. Over time, this can lead to:

• Immune system dysfunction

• Degenerative diseases such as kissing spines or arthritis

• Metabolic disorders (EMS, insulin resistance, laminitis)

• Mental strain such as nervousness, anxiety, or depression

• Digestive problems and ulcers

Stress is not limited to external stimuli. There are three major stress factors that can affect horses:

1. Physical Stress

o Lack of movement or inappropriate workload

o Injuries or accidents

o Muscle tension, back problems, kissing spines

2. Chemical Stress

o Mycotoxins in hay

o Heavy metals or high nitrate levels in water

o Mineral imbalances

o Unstable blood sugar due to poor feeding practices

3. Emotional Stress

o Loss of a herd member or caretaker

o Conflicts within the herd

o Strained relationship with the owner

o Suppressed emotions such as fear or grief

This last aspect is often underestimated: horses are highly social beings and react very sensitively to emotional states – both within the herd and from their human partners. If their emotional stress goes unnoticed and untreated, physical illnesses can develop. 

Reducing cortisol requires a holistic concept. Body, psyche, nutrition, and management must all be in balance.

1. Adequate Movement

Movement is the most natural and effective way for horses to relieve stress.

• Daily galloping over longer distances improves lung capacity and releases endorphins.

• Interval training (walk-trot transitions) helps to release tension without straining the joints.

• Regular free movement on sufficiently large paddocks or pastures is essential.

2. Proper Feeding

Balanced nutrition is key to maintaining stable blood sugar.

• Always feed hay before concentrates: this prevents cortisol release triggered by low blood sugar.

• Check hay quality (mycotoxins, sugar content).

• Avoid long feeding breaks, as they cause stress and stomach acid build-up.

3. Minerals, Vitamins & Omega-3 Fatty Acids

• Magnesium and B vitamins support nerve function.

• Omega-3 fatty acids (EPA, DHA) reduce inflammation.

• Herbal supplements like chasteberry, turmeric, valerian, or chamomile can have calming effects.

4. Emotional Balance and Co-Regulation

Horses mirror the emotions of their handlers. A calm, centered human transfers that energy to the horse.

• Breathing exercises activate the vagus nerve and help regulate the horse’s stress response.

• Conscious emotional regulation during handling and training.

• A stable herd environment to minimize emotional stress.

5. Physiotherapy & Manual Methods

• Masterson Method: releases deep-seated tension patterns through subtle impulses.

• Equine yoga and targeted stretches enhance flexibility.

• Regular physiotherapy prevents chronic muscle tightness.

6. Alternative Methods

• Acupuncture & acupressure: stimulate relaxation via vagus nerve activation.

• Aromatherapy: certain scents reduce stress and promote calmness.

• Medicinal mushrooms: support the immune system and reduce inflammation.

• Provide ample space for free movement – horses need room to run.

• Regularly monitor hay and water quality.

• Observe your horse attentively and without judgment – this is the only way to catch subtle signs of stress.

• Ensure a harmonious herd structure.

• Integrate rest and recovery phases into training.

• Use positive reinforcement instead of pressure-based training.

In my work as a stress management coach, I support both horses and riders in finding more balance and resilience. I offer individual coaching sessions where I teach:

• Co-regulation: learning to regulate your own nervous system so your horse can calm down with you.

• Acupressure techniques: simple, effective points to release tension and support relaxation.

• EFT (Emotional Freedom Technique) for horse and rider: a powerful tool to reduce anxiety, release blockages, and create harmony.

With these methods, horse and rider can build a deeper connection, reduce stress sustainably, and restore balance on both physical and emotional levels.

Cortisol is a vital hormone – but chronically high levels strain the equine body and can trigger severe health problems. The good news: with thoughtful management, proper nutrition, sufficient movement, and mindful interaction, horse owners can significantly reduce their animals’ stress levels.

A horse can only be in balance when body, nutrition, and emotions are aligned. And when horse and rider learn together how to manage stress, true harmony and health become possible.