Topical Magnesium for Horses: Benefits and Recovery Uses

Benefits, Science, and How to Use Magnesium Oil, Gel, Spray, and Epsom Salt for Post-Exercise Recovery

Recovery is one of the most important yet often overlooked components of maintaining soundness in performance horses. Intense training places significant mechanical and metabolic stress on muscles, connective tissues, and the neuromuscular system.

As riders and trainers look for ways to support muscle recovery, topical magnesium products have become increasingly popular in sport horse management. Magnesium oils, gels, sprays, and Epsom salt applications are frequently used after exercise to support muscle relaxation, reduce tension, and promote recovery.

Understanding the science behind magnesium and muscle physiology can help riders use these products more effectively as part of a comprehensive recovery program.

What Does Magnesium Do for Horse Muscles

Topical magnesium products such as magnesium oil, gels, sprays, and Epsom salt solutions are commonly used to support muscle relaxation and post-exercise recovery in horses.

Magnesium plays an important role in:

• neuromuscular signaling
• calcium regulation in muscle cells
• cellular energy metabolism
• muscle contraction and relaxation cycles

Because of these functions, magnesium is frequently applied to large muscle groups such as the back, hindquarters, and shoulders, or used as a soak for distal limbs following exercise.

Why Magnesium Supports Muscle Recovery

Magnesium is involved in more than 300 enzymatic reactions in the body, many of which influence muscle function and neuromuscular coordination (de Baaij et al., 2015).

Within skeletal muscle, magnesium helps regulate:

• muscle contraction and relaxation cycles
• ATP production and cellular energy metabolism
• calcium transport within muscle cells
• nerve transmission at the neuromuscular junction

ATP, the primary energy molecule used during muscle contraction, exists primarily as a magnesium ATP complex (Mg-ATP). This means magnesium availability directly influences cellular energy metabolism and muscular function (de Baaij et al., 2015).

Magnesium also helps counterbalance calcium activity inside muscle cells. While calcium triggers contraction, magnesium helps facilitate muscle relaxation after contraction (Rosanoff et al., 2012).

For this reason, magnesium is commonly associated with muscle relaxation and recovery support.

Exercise Stress and Muscle Recovery in Horses

During intense training, equine muscles experience several physiological stressors including:

• repetitive contraction cycles
• metabolic fatigue
• mechanical strain within muscle fibers
• accumulation of metabolic byproducts

Large muscle groups commonly affected include:

• the longissimus dorsi (primary back muscle)
• gluteal muscles
• hamstrings
• shoulder stabilizers

Supporting recovery of these muscle groups is important for maintaining comfort, performance, and long-term soundness.

Magnesium contributes to maintaining normal neuromuscular excitability and muscle relaxation following exercise (Volpe, 2015).

Magnesium Products Commonly Used in Horses

Several forms of topical magnesium are used in equine recovery routines.

Magnesium Oil for Horses

Magnesium oil is typically a concentrated magnesium chloride solution applied directly to the skin.

Benefits of magnesium oil include:

• convenient spray or rub-on application
• easy coverage of large muscle groups
• commonly used after intense schooling sessions

Magnesium oil is most often applied to:

• the back
• gluteal muscles
• hamstrings
• shoulders

Magnesium Gel and Massage Therapy

Magnesium gels provide a thicker formulation that allows targeted application combined with massage.

This approach combines:

• topical magnesium exposure
• manual soft tissue therapy
• stimulation of local circulation

Massage during application may help support muscle relaxation and perceived recovery after intense work (Weerapong et al., 2005).

Magnesium Spray for Quick Recovery

Magnesium sprays provide a convenient option for quick post-exercise recovery routines, particularly at competitions.

They are often used when riders want to support muscle recovery but have limited time for a full massage routine.

Epsom Salt Solutions for Horses

Epsom salt contains magnesium sulfate, which dissolves easily in water and has traditionally been used in therapeutic soaking solutions.

Epsom salt solutions are commonly prepared by dissolving magnesium sulfate in warm water and applying it by:

• sponging onto large muscle groups such as the back and hindquarters
• soaking distal limbs such as the fetlock, cannon bone, and pastern region

Extremity soaking is frequently used in performance barns following activities that place significant stress on tendons and ligaments such as jumping, galloping, or cross-country work.

This method combines:

• topical magnesium exposure
• warm water hydrotherapy
• circulation support in distal limbs

Extremity Soaking with Epsom Salt

In addition to muscle application, Epsom salt solutions are often used to soak extremities following exercise.

Common barn protocols include soaking:

• the fetlock region
• the cannon bone
• the pastern and hoof area

This practice may support recovery through several mechanisms.

Warm water immersion can increase local circulation and help relax surrounding soft tissues. Hydrotherapy is widely used in rehabilitation settings to support tissue recovery and improve circulation.

Magnesium sulfate exposure may also influence local neuromuscular signaling and muscle relaxation.

Although research specifically evaluating Epsom salt limb soaks in horses is limited, hydrotherapy and warm water immersion are well established in rehabilitation medicine.

Does Magnesium Absorb Through the Skin?

One of the most frequently asked questions about topical magnesium is whether it can be absorbed through the skin.

Some research suggests magnesium may enter the body through:

• hair follicles
• sweat glands
• small microchannels within the skin barrier

Waring (2013) reported that transdermal magnesium exposure may influence systemic magnesium levels, although the degree of absorption remains an area of ongoing research.

While systemic absorption may vary, topical magnesium may still influence local muscle comfort and neuromuscular signaling.

Integrating Magnesium Into a Recovery Routine

Topical magnesium works best when integrated into a comprehensive recovery strategy.

Effective recovery programs for performance horses often include:

• appropriate conditioning and workload management
• hydration and electrolyte balance
• cold therapy when indicated
• massage and manual therapies
• chiropractic care to support spinal motion and neuromuscular coordination

Chiropractic adjustments aim to restore normal joint motion and neuromuscular signaling, which may help reduce compensatory muscle tension and improve movement efficiency.

When combined with thoughtful recovery strategies, this approach supports both muscular recovery and biomechanical function.

Best Practices for Using Magnesium on Horses

To support recovery:

• apply magnesium products after intense exercise
  • target large muscle groups such as the back and hindquarters
  • use Epsom salt solutions to sponge muscles or soak distal limbs
  • combine topical magnesium with massage when possible
  • incorporate magnesium into a consistent post-exercise routine

Consistency in recovery routines is often just as important as the specific products used.

Frequently Asked Questions About Topical Magnesium

Does magnesium help horses relax muscles?

Magnesium plays a role in neuromuscular signaling and calcium regulation within muscle cells. Because magnesium supports the muscle relaxation phase following contraction, it is commonly used to support recovery after intense exercise (Volpe, 2015).

Can Epsom salts help horse legs after work?

Epsom salt solutions are frequently used to soak distal limbs following exercise. Warm water hydrotherapy can increase circulation, while magnesium sulfate exposure may support local muscle relaxation.

Is topical magnesium proven to absorb through the skin?

Research suggests magnesium may be absorbed through hair follicles and sweat glands, but the degree of systemic absorption remains an area of ongoing investigation (Waring, 2013).

Even without significant systemic absorption, topical magnesium may still influence local muscle comfort and relaxation.

Key Takeaways

Magnesium plays an important role in muscle relaxation, neuromuscular signaling, and energy metabolism.

Topical magnesium products such as oils, gels, sprays, and Epsom salt solutions are widely used in performance horses to support muscle recovery following exercise.

Epsom salt applications can be used both for muscle sponging and extremity soaking, particularly after intense work that stresses tendons and distal limb structures.

When combined with proper conditioning, recovery strategies, and biomechanical care, topical magnesium can be a valuable component of maintaining comfort and performance in equine athletes.

FAQ

Does magnesium help horse muscles relax?
Magnesium supports neuromuscular signaling and helps regulate muscle contraction and relaxation cycles.

Can you use Epsom salt on horse legs?
Epsom salt solutions are commonly used to sponge muscles or soak distal limbs following intense exercise.

Does magnesium absorb through horse skin?
Some research suggests magnesium may enter through hair follicles or sweat glands, although absorption varies.

References

de Baaij JHF, Hoenderop JGJ, Bindels RJM. 2015. Magnesium in man: implications for health and disease. Physiological Reviews. 95(1):1–46.

Rosanoff A, Weaver CM, Rude RK. 2012. Suboptimal magnesium status in the United States: are the health consequences underestimated? Nutrients. 4(4):181–217.

Volpe SL. 2015. Magnesium in disease prevention and overall health. Nutrients. 7(9):8199–8226.

Waring RH. 2013. Report on absorption of magnesium sulfate across the skin. Magnesium Research.

Weerapong P, Hume PA, Kolt GS. 2005. The mechanisms of massage and effects on performance, muscle recovery, and injury prevention. Sports Medicine. 35(3):235–256.

Author

Dr. Arianna Aaron, DC, IVCA
Founder, Peak Performance International
Equine and Rider Chiropractic Care

Dr. Arianna Aaron is a chiropractor specializing in horse and rider biomechanics and performance optimization. Through Peak Performance International, she works with equine athletes and their riders to improve movement efficiency, address biomechanical restrictions, and support long term soundness and athletic performance.