Some horses are just wired differently. They spook easily, are hard to load, fall apart at competitions or become difficult to ride around other horses. Before reaching for a calming supplement, it helps to understand the options. and which ingredients are actually backed by evidence versus marketing claims.
First: rule out pain and health issues
Horses that are suddenly more reactive, tense or difficult to ride may be in pain. Back soreness, gastric ulcers, dental problems and poorly fitting tack are all common causes of behaviour that looks like anxiety. A calming supplement will not fix these. Have your vet assess the horse if the change in behaviour is recent or unexplained.
Ingredients that have evidence
- Magnesium. the best-studied calming ingredient in horses. Magnesium deficiency is associated with nervousness, muscle twitching and hypersensitivity. Many horses in hard work or on grass-heavy diets are marginally deficient. Oral supplementation is safe and often effective.
- L-tryptophan. a precursor to serotonin. Some evidence for reducing anxiety in horses, though the effect is modest and dose-dependent.
- B vitamins. B1 (thiamine) in particular is associated with nervous system function. Horses in heavy work may benefit from B vitamin support.
Ingredients that are FEI prohibited
Many popular herbal calming products contain ingredients that are prohibited under FEI rules. even though they are sold as "natural":
- Valerian. prohibited. One of the most commonly tested-positive substances in competition horses from supplement use.
- Passionflower. prohibited
- Hops. prohibited
- Kava. prohibited
If you compete, only use supplements that have been FEI batch-tested. Never assume "herbal" means allowed.
When to use a calming supplement
Calming supplements work best for horses that have an underlying anxious temperament or are in situations that reliably cause stress: transport, competing away from home, clipping, farriery. They are not a training substitute. a horse that does not understand what is being asked of it will not be helped by magnesium alone.
ZEN by Horse Tonic
ZEN is a liquid magnesium-based calming supplement developed for sport horses. It is FEI-tested and can be used during competition season. The liquid format means it can be given a few hours before a stressful event as well as daily for horses that need ongoing support.