A horse's immune system does its best work when the basics are right — good forage, low stress, up-to-date vaccinations and worming. Immune-support supplements top that foundation up, particularly for veterans, horses under stress (travel, competition, new yards) and seasonal challenges. The range covers garlic (the traditional staple), herbal immune blends, omega-3 oils, and gut-support options — a healthy gut and a healthy immune system go hand in hand. Just Horse Riders stocks them from brands including NAF, Gold Label, Global Herbs and Protexin, from around £3.

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Advice from the Just Horse Riders team — last reviewed June 2026. These supplements support normal immune function — an unwell, feverish or off-colour horse needs your vet, not a supplement.

In a hurry? For general support, garlic remains the value staple, with herbal immune blends and omega oils for more targeted support. Get the foundations right first — vaccination, worming, forage and low stress do more than any tub.

Immune support at a glance

Type	Best for
Garlic	The traditional everyday staple (sensible rates)
Herbal immune blends	Veterans and horses under seasonal or stress challenge
Omega-3 oils	All-round condition and normal immune function
Gut support	The gut-immune link — balancers support both

Foundations before supplements

The immune system's best friends are boring: vaccinations on schedule, a vet-led worming plan, plenty of forage, fresh air and a settled routine. Supplements are the top-up for horses with extra demands — age, travel, competition stress or a hard season — not a substitute. And a horse who is actually unwell, feverish or rapidly losing condition is a same-day vet call.

Immune favourites

The value staple: Gold Label Garlic Powder (from £3.19) or NAF Garlic Granules (from £5.58).
Targeted herbal support: Global Herbs Sarc-Ex (from £40.54).
Omega oil: Lincoln Flax Oil (from £8.53).
Gut-immune link: Protexin Gut Balancer (from £13.39).

Frequently asked questions

How can I support my horse's immune system?

Foundations first: vaccination, a proper worming plan, good forage, fresh air and low stress. A supplement — garlic, a herbal blend or omega oil — then supports normal immune function on top, especially for veterans and horses under extra demand.

Is garlic safe for horses?

At recommended feeding rates, garlic is widely fed and well tolerated. Don't exceed the guide rate — excessive long-term feeding has been linked to blood changes — and skip it for horses with a history of anaemia.

Why does gut health matter to immunity?

A large share of immune activity is associated with the gut, so a stable, healthy digestive system supports the immune system too. That's why gut balancers appear in immune-support plans, especially around stress and antibiotics.

When should I call the vet instead?

Fever, dullness, going off feed, rapid weight or condition loss, or repeated infections — all vet, same day where fever is involved. Supplements support a healthy horse; they don't treat illness.

Not sure what your horse needs? Tap the WhatsApp button at the bottom of the screen and one of the team will help.

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