Updated:23 October 2026
Rank 1-16 of the best Magnesium Horses
Our recommendation Price Customer rating
1. Comparison winner
NAF Five Star Magic 1.5kg Calming Supplement for Horses – Magnesium-Based Formula with Herbal Extracts
NAF Five Star Magic 1.5kg Calming Supplement for Horses – Magnesium-Based Formula with Herbal Extracts
Available immediately
free shipping
  • magnesium content provided to support relaxation of tense muscles and to maintain a calm and focused state in horses
  • calming effect achieved without sedation
  • composition is a blend of calming herbs with magnesium to reduce anxiety and promote focus
Our rating
9,8
very good
2. Best value
AnxiKalm Compete Equine Calming Supplement with L-Tryptophan & Magnesium – For Horses & Ponies – 1.2 kg
AnxiKalm Compete Equine Calming Supplement with L-Tryptophan & Magnesium – For Horses & Ponies – 1.2 kg
Available immediately
free shipping
  • magnesium content: 333,000 mg of magnesium oxide per daily serving to support nerve and muscle health
  • B vitamins: includes thiamine (B1), riboflavin (B2), niacin (B3), vitamin B6 and folic acid to support nervous system health
  • calming effect: helps calm excitable horses and ponies without sedation, suitable for stressful situations such as competitions or travel
Our rating
9,8
very good
3. Bestseller
Equine America Magnitude Powder 1kg
Equine America Magnitude Powder 1kg
Available immediately
free shipping
  • contains magnesium to support healthy nerve endings and fibres
  • provides B vitamins to promote overall health
  • helps reduce tension and nervousness in horses
Our rating
9,6
very good
Equimins Magnesium Calmer 1kg
Equimins Magnesium Calmer 1kg
Available immediately
free shipping
  • digestible sources of magnesium for optimal absorption
  • includes B vitamins for overall health
  • inducing a calm and controlled attitude in horses
Our rating
9,6
very good
Freestep Steady Horse Calmer Powder Magnesium Oxide for Mares, Rigs and Colts
Freestep Steady Horse Calmer Powder Magnesium Oxide for Mares, Rigs and Colts
Available immediately
free shipping
  • magnesium content provided by magnesium oxide to support relaxed muscles and calmer responses
  • calming effect supports steady behaviour, improved focus and trainability for nervous or sharp horses during schooling, hacking or travel
  • usage duration intended for daily ongoing use as part of regular stable management start with the recommended daily amount and adjust to the individual horse can be doubled before events if necessary
Our rating
9,6
very good
Spillers Calm Horse Supplement with Magnesium - for Horses and Ponies, 3 kg (30-day supply)
Spillers Calm Horse Supplement with Magnesium - for Horses and Ponies, 3 kg (30-day supply)
Available immediately
free shipping
  • two sources of magnesium to support calmer behaviour in nervous horses
  • a blend of B vitamins to support nervous system function in horses
  • helps to promote a calmer behaviour in nervous or excitable horses
Our rating
9,6
very good
Cool It Powder 900g – Calmer for Horses (Magnesium-based) with L-Tryptophan, Vitamin B1 & Probiotics
Cool It Powder 900g – Calmer for Horses (Magnesium-based) with L-Tryptophan, Vitamin B1 & Probiotics
Available immediately
free shipping
  • magnesium content: magnesium oxide in chelated form
  • b vitamins: contains vitamin b1 (thiamine)
  • calming effect: helps support nervous or unsettled horses during travel and competition, changes in training or stables, and before firework events
Our rating
9,6
very good
Freestep Composure Horse Calmer Magnesium & Vitex Powder for Mares
Freestep Composure Horse Calmer Magnesium & Vitex Powder for Mares
Available immediately
free shipping
  • magnesium content supports relaxed behaviour and a composed mindset during busy periods or new environments
  • calming effect supports steady behaviour, improved focus and rideability for nervous or excitable horses
  • usage duration is for daily ongoing use to provide ongoing support during schooling, travel and yard changes
Our rating
9,6
very good
NAF Five Star Magic Liquid 1L Magnesium-Based Calmer for Horses
NAF Five Star Magic Liquid 1L Magnesium-Based Calmer for Horses
Available immediately
free shipping
  • bioavailable magnesium supports the nervous system and promotes calm
  • calming effect helps ease nervousness and promotes relaxed behaviour
  • suitable for long-term daily use in training and competition settings
Our rating
9,6
very good
Puur Magnesium Horse Supplement - 500g
Puur Magnesium Horse Supplement - 500g
Available immediately
free shipping
  • high magnesium content for muscle and nerve function
  • rich in B vitamins for energy metabolism support
  • provides a calming effect to help reduce stress
Our rating
9,6
very good
Horse Herbs Magnesium Oxide 2kg for Horses & Ponies
Horse Herbs Magnesium Oxide 2kg for Horses & Ponies
Available immediately
free shipping
  • Magnesium content: magnesium oxide provides essential magnesium to support healthy muscle function in horses
  • Calming effect: magnesium has natural calming properties to reduce anxiety and support a more relaxed and focused horse
  • Composition: magnesium oxide with no harmful additives to provide a safe and effective supplement for horses
Our rating
9,5
very good
Horse Herbs Magnesium Oxide 1kg Supplement
Horse Herbs Magnesium Oxide 1kg Supplement
Available immediately
free shipping
  • contributes to muscle function and helps relieve cramping
  • contains magnesium oxide which aids digestive health
  • possesses natural calming properties for reducing anxiety and stress
Our rating
9,4
good
Omega Equine Magnesium 750 g
Omega Equine Magnesium 750 g
Available immediately
free shipping
  • magnesium content supplied as magnesium oxide powder to support muscle and nerve function
  • calming effect supports relaxed muscles and overall wellbeing
  • usage duration a 750 g package lasts approximately 150 days for a horse fed at two scoops per day
Our rating
9,1
good
NAF Five Star Instant Magic Calming Syringe for Horses, 3 x 30ml, Magnesium and Herbal Extracts
NAF Five Star Instant Magic Calming Syringe for Horses, 3 x 30ml, Magnesium and Herbal Extracts
Available immediately
free shipping
  • magnesium content: contains bio-available magnesium to support the nervous system
  • calming effect: fast-acting formula designed to provide instant support during stressful or high-pressure situations
  • composition: magnesium-based formula with calming herbal extracts to support the nervous system and reduce excitability
Our rating
9,1
good
Freestep Magnesium Calmer Calming Spray for Horses
Freestep Magnesium Calmer Calming Spray for Horses
Available immediately
free shipping
  • Magnesium content: transdermal magnesium spray delivers fast absorption through the skin to support relaxation
  • Calming effect: reduces anxiety and nervous behaviour in excitable or spooky horses to promote a calm, focused attitude
  • Usage duration: works in around 20 minutes for rapid calming before travel, competition or training
Our rating
9,1
good
Magnesium Oxide Animal Feed Supplement 1kg
Magnesium Oxide Animal Feed Supplement 1kg
Available immediately
free shipping
  • 98.3% pure magnesium oxide content
  • contains B vitamins to support health
  • known for its calming effect on horses
Our rating
9,1
good

Similar Magnesium Horse comparisons

Magnesium Horses buying guide: How to choose the right product from the above Magnesium Horses test or comparison

Understanding Magnesium for Horses: The Essentials

What is Magnesium?

Magnesium is an essential mineral that plays a crucial role in numerous bodily functions in horses. Just like us, horses require magnesium for muscle function, nerve transmission, energy production, and overall health. While magnesium is present in some feed and forage, it may not always be sufficient to meet a horse’s needs, especially for those with specific dietary requirements or strenuous activity levels.

Why is Magnesium Important?

Magnesium helps maintain normal muscle contraction and relaxation, which is important for performance horses, especially during intense exercise. It also supports the nervous system, helping to reduce anxiety and stress. Inadequate levels of magnesium can lead to muscle spasms, nervousness, and decreased performance in our equine companions.

Benefits of Magnesium Supplementation for Your Horse

Enhancing Performance and Recovery

Supplementing with magnesium can help improve a horse’s performance by aiding in muscle recovery and reducing fatigue. This is particularly beneficial during competition or training, where optimal muscle function is vital. Horses given magnesium supplements often show improved stamina and faster recovery times.

Supporting Behaviour and Stress Management

Many horse owners notice a marked improvement in their horse’s behaviour when magnesium levels are adequate. Magnesium has a calming effect, which can help manage stress during transportation, competition, or in new environments. A calm horse is easier to handle and perform with, making magnesium supplementation a great investment for spirited or anxious horses.

How to Choose the Right Magnesium Product for Your Horse

Identifying Your Horse’s Needs

Choosing the right magnesium supplement begins with understanding your horse’s specific needs. Factors such as age, weight, activity level, and overall health play a significant role. For instance, if your horse is in heavy training or competition, a higher dosage may be required to replenish lost nutrients and ensure optimal performance.

Formulations Matter

Magnesium supplements come in various forms, including powders, pellets, and liquids. Each has its own advantages, depending on your horse’s preferences and your feeding routine. Powders may be mixed with feed, while pellets could be a better option for picky eaters. Liquids can be easier to administer but check the concentration to ensure you’re giving the correct dose.

Best Practices for Administering Magnesium to Your Horse

Consistency is Key

For optimal results, consistency when administering magnesium is crucial. We recommend incorporating the supplement into your horse’s daily feeding routine rather than offering it sporadically. This ensures your horse receives a steady supply, maintaining adequate magnesium levels in the system.

Monitor and Adjust Dosages

Every horse is different, so it’s important to monitor your horse’s response to the supplementation. Keep an eye on changes in behaviour, performance, and muscle condition. If you notice any issues, consider adjusting the dosage in consultation with your veterinarian, as they can provide tailored advice based on your horse’s unique health profile.

Table of contents
  1. Understanding Magnesium for Horses: The Essentials
  2. Benefits of Magnesium Supplementation for Your Horse
  3. How to Choose the Right Magnesium Product for Your Horse
  4. Best Practices for Administering Magnesium to Your Horse

Overview

1. Comparison winner
NAF Five Star Magic 1.5kg Calming Supplement for Horses – Magnesium-Based Formula with Herbal Extracts
Our rating
9,8
very good
NAF Five Star Magic 1.5kg Calming Supplement for Horses – Magnesium-Based Formula with Herbal ExtractsAvailable immediately
2. Best value
AnxiKalm Compete Equine Calming Supplement with L-Tryptophan & Magnesium – For Horses & Ponies – 1.2 kg
Our rating
9,8
very good
AnxiKalm Compete Equine Calming Supplement with L-Tryptophan & Magnesium – For Horses & Ponies – 1.2 kgAvailable immediately
3. Bestseller
Equine America Magnitude Powder 1kg
Our rating
9,6
very good
Equine America Magnitude Powder 1kgAvailable immediately
Equimins Magnesium Calmer 1kg
Our rating
9,6
very good
Equimins Magnesium Calmer 1kgAvailable immediately
Freestep Steady Horse Calmer Powder Magnesium Oxide for Mares, Rigs and Colts
Our rating
9,6
very good
Freestep Steady Horse Calmer Powder Magnesium Oxide for Mares, Rigs and ColtsAvailable immediately
Spillers Calm Horse Supplement with Magnesium - for Horses and Ponies, 3 kg (30-day supply)
Our rating
9,6
very good
Spillers Calm Horse Supplement with Magnesium - for Horses and Ponies, 3 kg (30-day supply)Available immediately
Cool It Powder 900g – Calmer for Horses (Magnesium-based) with L-Tryptophan, Vitamin B1 & Probiotics
Our rating
9,6
very good
Cool It Powder 900g – Calmer for Horses (Magnesium-based) with L-Tryptophan, Vitamin B1 & ProbioticsAvailable immediately
Freestep Composure Horse Calmer Magnesium & Vitex Powder for Mares
Our rating
9,6
very good
Freestep Composure Horse Calmer Magnesium & Vitex Powder for MaresAvailable immediately
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