Immune Booster Plus for Horses — Natural Immune & Respiratory Support

Immune Booster Plus is a natural New Zealand-made herbal extract designed to support your horse’s immune system, respiratory comfort and everyday vitality.

It is especially useful when your horse is feeling run down, recovering after a seasonal bug, coughing, snotty, low in energy, or needing extra support through winter and changing weather.

Made in an organic cider vinegar base, this traditional herbal blend contains echinacea, garlic, marshmallow, mullein, rosehips, kelp, Siberian ginseng and yarrow — herbs traditionally used to support healthy immunity, clear airways, throat comfort and resilience.

✔ Natural herbal immune support for horses
✔ Supports respiratory comfort and clear airways
✔ Alcohol-free
✔ Made in New Zealand
✔ Organic cider vinegar base
✔ Trusted by NZ horse owners for over 25 years
✔ 100% money-back guarantee

When to Use Immune Booster Plus

Immune Booster Plus may be helpful for horses needing support with:

• Seasonal immune support
• Winter wellness
• Respiratory comfort
• Coughing or throat irritation
• Snotty noses or seasonal bugs
• Recovery after being run down
• Stamina, vitality and resilience
• Extra support during weather changes

If your horse has a persistent, severe or worsening cough, breathing difficulty, fever, or appears unwell, please contact your vet.

What Customers Tell Us

Horse owners often use Immune Booster Plus when their horses are coughing, snotty, run down or needing extra support through the colder months.

“I wanted to give you some feedback on your Immune Booster Plus which I purchased for my horse. After two days of treatment, his rather disgusting snotty nose had totally cleared, and another two days following this, his cough had gone too. Thanks for a fantastic product that truly does work wonders. I will be recommending it to everyone. Thanks again Jackie — my horse is happy, I am happy.”
— Nicki Taylor

“Recently one of my horses developed the most awful cough. I was hoping it would just right itself but after a week he was really no better, so I bought the herbal Immune Booster Plus and within 4 days he was better. Thanks for your great products.”
— Penny

“I bought the Immune Booster Plus as suggested for my horse’s cough and cold. I did think about the vet as it seemed to be getting worse, but after a couple of days with the herbs it’s just about cleared up. Thanks so much, will be recommending your products.”
— Colleen

Key Herbs in Immune Booster Plus

• Echinacea

Traditionally used to support healthy immune function and seasonal resilience.

• Garlic

Traditionally used to support immune and respiratory health.

• Marshmallow and Mullein

Traditionally used to soothe the throat and support respiratory comfort.

• Rosehips and Kelp

Naturally rich in nutrients, including vitamin C and minerals.

• Siberian Ginseng

Traditionally used to support stamina, resilience and vitality.

• Yarrow

Traditionally used in herbal formulas for seasonal wellness support.

 Which Size Should I Choose?

500ml

Best for trying the product, short-term support, or smaller horses.

1 litre

Best everyday value for regular use. At 20ml daily, a 1 litre bottle lasts around 50 days.

5 litres

Best for multiple horses, long-term seasonal support, or keeping on hand through winter.

Feeding Guide

Up to 13.2hh: 5–10ml daily
13.2hh–15.2hh: 20ml daily
15.2hh and over: 30ml daily

Mix daily with feed or syringe directly into the mouth.

The dose may be given once daily or split between feeds.

Shake well before use. Store in a cool place away from direct sunlight.

A 1 litre bottle gives approximately 50 days of support at 20ml per day.

Why Horse Owners Choose Brookby Herbs

Brookby Herbs has been trusted by New Zealand horse and dog owners for over 25 years.

Our herbal extracts are made in New Zealand using traditional herbal knowledge and practical experience with animals. Immune Booster Plus is alcohol-free and made in an organic cider vinegar base, making it easy to add to your horse’s daily feed.

Every bottle is backed by our 100% money-back guarantee.

Frequently Asked Questions

Can I give Immune Booster Plus to my horse every day?

Yes. Immune Booster Plus can be given daily as part of your horse’s seasonal immune support routine.

Is Immune Booster Plus alcohol-free?

Yes. It is made in an organic cider vinegar base and contains no alcohol.

When should I use Immune Booster Plus?

It is commonly used during winter, seasonal changes, after your horse has been run down, or when extra immune and respiratory support is needed.

Can I use it for a coughing horse?

Immune Booster Plus contains herbs traditionally used to support respiratory comfort and soothe the throat. If your horse has a persistent, severe or worsening cough, contact your vet.

How long will a 1 litre bottle last?

At 20ml per day, a 1 litre bottle lasts approximately 50 days.

Can I use Immune Booster Plus alongside other Brookby Herbs products?

Yes, in most cases it can be used alongside other Brookby Herbs products. If your horse is on medication, pregnant, has a serious health condition, or you are unsure, check with your vet.

Give Your Horse Daily Immune & Respiratory Support

Support your horse through winter, seasonal changes and times when they need extra resilience with Immune Booster Plus.

Choose your size above and add to your horse’s daily feed.