We often hear that horses need electrolytes after hard work or in warm weather – but what exactly are electrolytes, and why are they so important?
What are electrolytes?
Electrolytes are essential minerals that help your horse’s body function properly. They play a key role in:
· Keeping your horse hydrated
· Supporting nerve and muscle function
· Helping nutrients move around the body
· Maintaining a healthy fluid balance
The five key electrolytes are sodium, chloride, potassium, calcium and magnesium. Because horses can’t store electrolytes in their bodies, they need a regular supply through their diet.
Whilst forage and grass do provide some electrolytes, modern grazing is often low in sodium, and levels of calcium and magnesium can vary. This means many horses may not get enough from diet alone.
Do horses only lose electrolytes through sweat?
Not quite. Although sweating is the main way electrolytes are lost, horses also lose them through breathing and urination.
So even if your horse doesn’t look particularly sweaty after exercise, they may still have lost important electrolytes. Horses in regular work or training often need more electrolytes than those at rest, due to the physical stress placed on their bodies.
So, now we know why electrolytes are important – but what do they actually do?
What do electrolytes do within the body?
Each electrolyte has a specific role:
Sodium and Chloride: help regulate fluid balance and hydration. Sodium deficiency is quite common and can lead to reduced performance.
Potassium: supports muscle and nerve function. Usually found in forage, but levels can drop if your horse eats less after exercise.
Calcium and Magnesium: important for muscle function, recovery, and bone health. While they are stored in the body, they aren’t quickly available when needed.
So, now that we know what each of the key electrolytes are responsible for within the body, we need to understand how the body processes them, and what can happen if a horse does not receive enough…
Electrolyte uptake and absorption
Electrolytes are usually given in feed, water or via syringe. Once consumed, they are absorbed in the small intestine and transported around the body via the bloodstream.
Water intake is crucial – without enough water, electrolytes can’t be properly absorbed or used by the body.
What happens if a horse doesn’t receive enough electrolytes?
Over time, low electrolyte levels can lead to:
· Dehydration
· Tiredness and slow recovery
· Muscle problems
· Increased risk of colic
These issues usually develop gradually rather than from a single sweaty ride – but repeated losses without replacement can take their toll.
How do I ensure that my horse is receiving enough electrolytes?
For many horses, especially those in work, supplementation is the most practical solution.
Low workload or rest: adding salt (sodium and chloride) is often enough.
Regular work, sweating or competition: a complete electrolyte supplement is recommended, as it replaces all key minerals in the right balance.
Providing electrolytes in the right amounts can:
· Support faster recovery after exercise
· Help maintain hydration
· Reduce the risk of health issues linked to deficiency
Products such as Nourish Ultimate Electrolytes can provide the correct amounts of the key electrolytes lost through sweat.
Key Takeaways
- Electrolytes aren’t just for hot days or competitions – they play a vital role in your horse’s everyday health
- The five key electrolytes are sodium, chloride, potassium, calcium, and magnesium – and each one has a specific role in the body
- Symptoms of deficiency can develop slowly – so it is best to ensure your horse is having losses replaced before deficiency takes its toll
- Supplementing with electrolytes is the easiest way to ensure your horse is getting everything they need
For more information about Nourish Ultimate Electrolytes, click here.
References
Coenen, M. (2013) Macro and trace elements in equine nutrition. In: Geor, R., Harris, P. and Coenen, M., eds. (2013) Equine Applied and Clinical Nutrition. China: Saunders Elsevier, pp. 191-228.
Farina Alshut, Venner, M., Gunilla Martinsson, & Vervuert, I. (2023). The effects of feeding sodium chloride pellets on the gastric mucosa, acid‐base, and mineral status in exercising horses. Journal of Veterinary Internal Medicine, 37(6), 2552–2561. https://doi.org/10.1111/jvim.16851
Lindinger, M. I., & Ecker, G. L. (2012). Gastric emptying, intestinal absorption of electrolytes and exercise performance in electrolyte-supplemented horses. Experimental Physiology, 98(1), 193–206. https://doi.org/10.1113/expphysiol.2012.065185
Lindinger, M. (2022). Oral Electrolyte and Water Supplementation in Horses. Veterinary Sciences, 9(11), 626. https://doi.org/10.3390/vetsci9110626
Walker, W. T., Callan, R. J., Hill, A. E., & Tisher, K. B. (2014). Effects of oral powder electrolyte administration on packed cell volume, plasma chemistry parameters, and incidence of colic in horses participating in a 6-day 162-km trail ride. The Canadian veterinary journal = La revue veterinaire canadienne, 55(8), 765–771.
Waller, A. P., & Lindinger, M. I. (2021). Pre‐loading large volume oral electrolytes: tracing fluid and ion fluxes in horses during rest, exercise and recovery. The Journal of Physiology, 599(16), 3879–3896. https://doi.org/10.1113/jp281648