immune support
free shipping over $100 (USA & Canada)
1-877-937-4372 the pet expert hotline
Detoxifies the Blood and Organs, Boosts (support) the Immune System
Buckthorn bark has been valued for centuries thanks to its natural cleansing properties. Some know the buckthorn plant as just a hardy shrub found in nature. But the real magic lies in its aged, dried bark. Today, holistic pet parents and holistic veterinarians turn to this ancient herb in modern formulas, such as NHV BK-Detox, a vet-approved supplement to support fur kids’ natural detoxification systems. This is everything you need to know about buckthorn bark for dogs and cats!
So, what is buckthorn bark for pets? Well, let’s start by looking at the plant itself.

Buckthorn has many names: alder buckthorn, glossy buckthorn, or breaking buckthorn. But no matter what you call it, they all come from the Rhamnaceae family. It’s native to Europe, northern Africa, and western Asia, calling the ancient and beautifully varied landscapes there its home.
Buckthorn has greenish blooms, and its berries are rich and dark. Don’t confuse it with the similarly named “sea buckthorn,” which has orange berries.
However, it is the bark of the branches that holds many of its beneficial properties. This bark is typically dried for a period of time, allowing the therapeutic compounds inside to support the gut as a mild and natural laxative.
Traditional healing practices have long incorporated buckthorn. It was even described by a Greek physician named Galen over two centuries ago as potentially being useful for headaches, poisons, and witchcraft. Though we’re not too sure about that last one, buckthorn has been confirmed by science as a gentle laxative thanks to its “anthraquinone” content: a compound that naturally stimulates the gut.
Herbalists reach for buckthorn bark all the time, but what does the science say?
As it turns out, research suggests that buckthorn is a bountiful source of beneficial natural compounds. As we mentioned before, this includes Anthraquinones, found in the bark and leaves. The anthraquinones can be up to 3 – 7 % of the total mass of buckthorn.

These compounds show promising antioxidant activity. But they may also be helpful as a natural laxative, which is why it may have uses for our pets. For constipation in dogs or cats, it may offer gentle stimulation in the gut in the right doses, helping to eliminate waste from the digestive tract.
But that’s not all; it turns out buckthorn is a multi-tasker. This herb also contains high levels of phenolic substances (specifically in the bark), contributing to its free-radical-fighting capabilities. That means pets who need a bit of extra support for their cells may benefit from this herb.
Buckthorn bark for pets is best used in veterinarian-approved amounts, such as those found in NHV formulations. That way, you can be confident you are giving a safe, balanced dose. Supplements made for humans may not be formulated in a way that is appropriate for a pet’s weight or needs.
You can find a vet-approved amount of buckthorn in NHV BK-Detox, a supplement to support your pet’s detoxification systems. It’s a 100% natural formula that pet parents have been trusting for over 25 years.
Remember, the dosage and quality of the herbal ingredients are crucial for safety and efficacy. We advise against using any herb without proper guidance and under the supervision of your pet’s veterinary team. NHV formulas are meticulously researched and made in a GMP-certified facility. They use only the highest quality organic or ethically harvested herbs. Each formulation was expertly developed by a holistic veterinarian and a master herbalist with a combined 50 years of experience in plant-based remedies. Through dedication and research, NHV formulations are safe and effective in extracting the medicinal properties of the herb through a patented process.
NHV uses a precise, vet-approved amount of buckthorn bark in NHV BK-Detox. We specially formulated it to support your pet’s natural detoxification processes by supporting the vital organs.

In this formula, buckthorn bark works alongside other herbs like sarsaparilla, red clover, and burdock. Together, they promote the regular internal cleansing happening in your pet’s body already – not a harsh or destructive “cleanse.” By gently encouraging the elimination of toxins, you may help your pet get to feeling more like themselves again.
We often recommend NHV BK-Detox for pets dealing with compromised immune systems, skin tumor support, parasite recovery, or those needing gentle, body-wide detox support.
You may also find BK-Detox in tailored kits, such as the Blood Detox Gold Health Kit for blood disorders, or the Feline Immunodeficiency Virus (FIV) kit, where it helps to encourage detoxification.
Whether used to encourage flushing from the gut or as part of a broader wellness plan, our formulations use human-grade, vet-approved buckthorn bark. You can feel confident using it to support your pet’s everyday comfort.
Wondering if this NHV formula with buckthorn bark is right for your pet? Reach out to our friendly Pet Experts through our website chat or schedule a free 15-minute video chat to talk face-to-face. We look forward to meeting your fur kid and helping you choose the ideal wellness routine!
immune support
Cat Immune System Booster, Cancer Support, Gentle Detox, and Blood Cleanser
buy 2 and save $3
3 month supply for a small to medium size pet.
What is it?
All natural, gentle, herbal support for cats, dealing with compromised immune systems that helps detoxify the vital organs and blood.
How Does it Work?
Why Should I Trust It?
Vet-trusted and naturally sourced.
What is it?
All natural, gentle, herbal support for cats, dealing with compromised immune systems that helps detoxify the vital organs and blood.
How Does it Work?
Why Should I Trust It?
Vet-trusted and naturally sourced.
Cats live in a world full of pollutants that they breathe, ingest, and play in every day. BK Detox is a gentle herbal detox that helps Protect them with BK Detox, an all-natural cat immune system booster and detoxifier specially formulated to restore balance, regulate the immune system, and help your pet live a healthier, happier life.
BK Detox is especially useful for pets suffering from:
BK Detox will help your cat to gently flush out toxins from their vital organs and cleanse the blood. This is a cat immune supplement that promotes their long-term vitality.
The immune system plays an important role in helping your cat resist infection and overcome sickness.
When the immune system is compromised, toxins can accumulate in your cat and cause problems including liver disorders, urinary tract infections, skin allergies, tumors, bad breath, and respiratory issues.
“Boost” is a common term used for supplements that make the immune system work better, but supplements like NHV more accurately help to balance the immune system. The goal of cat immune system boosters like BK Detox is to balance the immune system so that it can more effectively respond to threats and process toxins out of their body.
BK Detox was formulated by a holistic veterinarian completely from 100% natural ingredients. It is safe for your cat to take alongside any conventional medicine prescribed by their veterinarian, including long-term medications.
See how BK Detox helped Holly with her allergies
How do you know if BK Detox will help your cat? Call our pet expert hotline at 1-877-937-4372 with questions about boosting your cat’s immune system. You can also visit our Pet Expert Q&A.

Red Clover – A blood-purifying herb with antibiotic and anti-inflammatory properties. It promotes cleansing and the elimination of toxins and deposits through diuretic and expectorant activity.
Cleavers – A tonic that increases the circulation of lymph-impaired areas of the body and aids in the drainage of lymph-engorged cysts, tumors, and inflamed tissues of the urinary tract.
Neem – An evergreen tree with powerful blood purifying and detoxifying effects.
Oregon Grape – Supports and improves digestion by helping rid the body of waste and toxins in the blood.
Gotu Kola – A small green herb known for its cleansing, diuretic, and strong antioxidant properties.
Buckthorn – A gentle laxative and blood-cleansing tonic.
Burdock – A highly effective blood purifier abundant in calcium, phosphorus, iron, thiamine, and riboflavin. Supports the entire body while gently eliminating toxic build up.
Sarsaparilla – A cleansing herb that stimulates the kidneys to flush deposits and clear toxins.
Echinacea Angustifolia – Cat immune system booster. Stimulates the body’s defense mechanism.
Chaparral – A blood purifying antioxidant rich in amino acids.
Prickly Ash – A tonic that stimulates the entire lymphatic system to encourage the elimination of toxic metabolites.
Select your pet's weight to determine the correct dose.
Bk Detox can be used as a detoxifier every 6 months. For best results administer the recommended dosage until the bottle is finished.
To be taken twice daily. Determine your pet’s weight and then use the easy chart below to determine the correct dose. This is the minimum dosage.
Pet's Weight Dosage
0 - 15 lb = 0.5 ml
16 - 30 lb = 1.0 ml
31 - 45 lb = 1.5 ml
46 - 60 lb = 2.0 ml
61 - 75 lb = 2.5 ml
Over 75 lb = 3.0 ml
How to Administer: Shake well before use. The easiest method is to use the dropper provided and place the drops into your pet’s food or favorite treat. You can also use the dropper and squirt directly into the pet’s mouth. Some pets can be finicky, if this occurs consider hiding the drops in foods most pet’s love such as fish, chicken, yogurt, or a favorite treat. If your pet only eats dry food then soak a few kibbles at feeding time.
For Best Results
Herbal dietary supplements are beneficial to the health and well-being of your pet and are safe for long-term use. Every pet responds to natural herbal supplements differently, therefore it is important to be consistent and administer the product daily. Supplements generally take two to four weeks to take effect, however this will vary from one animal to the next.
Product Storage
All NHV Natural Pet Products are pure herbal extracts and contain no artificial additives, preservatives, or coloring. Shelf life after opening is 6 months and must be refrigerated after opening.
Cautions and Contraindications
Do not use BK Detox in pregnant or nursing animals.
Speak to your vet before using our products. A second visit is recommended if your pet’s condition does not improve, or deteriorates after continued use of the supplements.
All information provided by NHV Natural Pet Products is for educational purposes only.
Cats live in a world full of pollutants that they breathe, ingest, and play in every day. BK Detox is a gentle herbal detox that helps Protect them with BK Detox, an all-natural cat immune system booster and detoxifier specially formulated to restore balance, regulate the immune system, and help your pet live a healthier, happier life.
BK Detox is especially useful for pets suffering from:
BK Detox will help your cat to gently flush out toxins from their vital organs and cleanse the blood. This is a cat immune supplement that promotes their long-term vitality.
The immune system plays an important role in helping your cat resist infection and overcome sickness.
When the immune system is compromised, toxins can accumulate in your cat and cause problems including liver disorders, urinary tract infections, skin allergies, tumors, bad breath, and respiratory issues.
“Boost” is a common term used for supplements that make the immune system work better, but supplements like NHV more accurately help to balance the immune system. The goal of cat immune system boosters like BK Detox is to balance the immune system so that it can more effectively respond to threats and process toxins out of their body.
BK Detox was formulated by a holistic veterinarian completely from 100% natural ingredients. It is safe for your cat to take alongside any conventional medicine prescribed by their veterinarian, including long-term medications.
See how BK Detox helped Holly with her allergies
How do you know if BK Detox will help your cat? Call our pet expert hotline at 1-877-937-4372 with questions about boosting your cat’s immune system. You can also visit our Pet Expert Q&A.

Red Clover – A blood-purifying herb with antibiotic and anti-inflammatory properties. It promotes cleansing and the elimination of toxins and deposits through diuretic and expectorant activity.
Cleavers – A tonic that increases the circulation of lymph-impaired areas of the body and aids in the drainage of lymph-engorged cysts, tumors, and inflamed tissues of the urinary tract.
Neem – An evergreen tree with powerful blood purifying and detoxifying effects.
Oregon Grape – Supports and improves digestion by helping rid the body of waste and toxins in the blood.
Gotu Kola – A small green herb known for its cleansing, diuretic, and strong antioxidant properties.
Buckthorn – A gentle laxative and blood-cleansing tonic.
Burdock – A highly effective blood purifier abundant in calcium, phosphorus, iron, thiamine, and riboflavin. Supports the entire body while gently eliminating toxic build up.
Sarsaparilla – A cleansing herb that stimulates the kidneys to flush deposits and clear toxins.
Echinacea Angustifolia – Cat immune system booster. Stimulates the body’s defense mechanism.
Chaparral – A blood purifying antioxidant rich in amino acids.
Prickly Ash – A tonic that stimulates the entire lymphatic system to encourage the elimination of toxic metabolites.
Select your pet's weight to determine the correct dose.
Bk Detox can be used as a detoxifier every 6 months. For best results administer the recommended dosage until the bottle is finished.
To be taken twice daily. Determine your pet’s weight and then use the easy chart below to determine the correct dose. This is the minimum dosage.
Pet's Weight Dosage
0 - 15 lb = 0.5 ml
16 - 30 lb = 1.0 ml
31 - 45 lb = 1.5 ml
46 - 60 lb = 2.0 ml
61 - 75 lb = 2.5 ml
Over 75 lb = 3.0 ml
How to Administer: Shake well before use. The easiest method is to use the dropper provided and place the drops into your pet’s food or favorite treat. You can also use the dropper and squirt directly into the pet’s mouth. Some pets can be finicky, if this occurs consider hiding the drops in foods most pet’s love such as fish, chicken, yogurt, or a favorite treat. If your pet only eats dry food then soak a few kibbles at feeding time.
For Best Results
Herbal dietary supplements are beneficial to the health and well-being of your pet and are safe for long-term use. Every pet responds to natural herbal supplements differently, therefore it is important to be consistent and administer the product daily. Supplements generally take two to four weeks to take effect, however this will vary from one animal to the next.
Product Storage
All NHV Natural Pet Products are pure herbal extracts and contain no artificial additives, preservatives, or coloring. Shelf life after opening is 6 months and must be refrigerated after opening.
Cautions and Contraindications
Do not use BK Detox in pregnant or nursing animals.
Speak to your vet before using our products. A second visit is recommended if your pet’s condition does not improve, or deteriorates after continued use of the supplements.
All information provided by NHV Natural Pet Products is for educational purposes only.
immune support
Es-Clear, Bk Detox, Turmeric, & Milk Thistle
bundle and save with pet expert kits
3 month supply for a small to medium size pet.
What is it?
These all-natural supplements work together to support the liver and aid with detoxification. An excellent kit to help support pets fighting cancers.
How Does it Work?
Why Should I Trust It?
100% natural remedies formulated by veterinarians.
What is it?
These all-natural supplements work together to support the liver and aid with detoxification. An excellent kit to help support pets fighting cancers.
How Does it Work?
Why Should I Trust It?
100% natural remedies formulated by veterinarians.
These all-natural supplements can be taken to synergistically support blood detoxification in your dog or cat. The four supplements, ES-Clear, Turmeric, Milk Thistle, and BK-Detox have been formulated by a veterinarian to work alongside conventional treatment. Supplement your pet with the Blood Detox Gold Health Kit for true comprehensive support.
NHV remedies are formulated by veterinarians with 20+ years of experience treating pets. Our approach to wellness using powerful, all-natural ingredients helps to support the comprehensive health of our cats and dogs.
Turmeric and milk thistle are two of the most potent detoxifying herbs available. NHV’s ES-Clear and BK-Detox are each formulated with multiple potent herbs that help your pet flush away toxins, and reverse the damage caused by toxins.
Select your pet's weight to determine the correct dose.
To be taken twice daily. Determine your pet’s weight and then use the easy chart below to determine the correct dose. This is the minimum dosage.
Pet's Weight Dosage
0 - 15 lb = 0.5 ml
16 - 30 lb = 1.0 ml
31 - 45 lb = 1.5 ml
46 - 60 lb = 2.0 ml
61 - 75 lb = 2.5 ml
Over 75 lb = 3.0 ml
For small animals (rabbits, ferrets), avians and reptiles use 1 drop for every 2 lb of body weight.
How to Administer
Shake well before use. The easiest method is to use the dropper provided and place the drops into your pet’s food or favorite treat. You can also use the dropper and squirt directly into the pet’s mouth. Some pets can be finicky, if this occurs consider hiding the drops in foods most pet’s love such as fish, chicken or yogurt or a favorite treat. If your pet only eats dry food then soak a few kibbles at feeding time.
For Best Results
Herbal dietary supplements are beneficial to the health and well-being of your pet and are safe for long-term use. Every pet responds to natural herbal supplements differently, therefore it is important to be consistent and administer the product daily. Supplements generally take two to four weeks to take effect, however this will vary from one animal to the next.
Product Storage
All NHV Natural Pet Products are pure herbal extracts and contain no artificial additives, preservatives or coloring. Shelf life after opening is 6 months and must be refrigerated after opening.
All information provided by NHV Natural Pet Products is for educational purposes only.
These all-natural supplements can be taken to synergistically support blood detoxification in your dog or cat. The four supplements, ES-Clear, Turmeric, Milk Thistle, and BK-Detox have been formulated by a veterinarian to work alongside conventional treatment. Supplement your pet with the Blood Detox Gold Health Kit for true comprehensive support.
NHV remedies are formulated by veterinarians with 20+ years of experience treating pets. Our approach to wellness using powerful, all-natural ingredients helps to support the comprehensive health of our cats and dogs.
Turmeric and milk thistle are two of the most potent detoxifying herbs available. NHV’s ES-Clear and BK-Detox are each formulated with multiple potent herbs that help your pet flush away toxins, and reverse the damage caused by toxins.
Select your pet's weight to determine the correct dose.
To be taken twice daily. Determine your pet’s weight and then use the easy chart below to determine the correct dose. This is the minimum dosage.
Pet's Weight Dosage
0 - 15 lb = 0.5 ml
16 - 30 lb = 1.0 ml
31 - 45 lb = 1.5 ml
46 - 60 lb = 2.0 ml
61 - 75 lb = 2.5 ml
Over 75 lb = 3.0 ml
For small animals (rabbits, ferrets), avians and reptiles use 1 drop for every 2 lb of body weight.
How to Administer
Shake well before use. The easiest method is to use the dropper provided and place the drops into your pet’s food or favorite treat. You can also use the dropper and squirt directly into the pet’s mouth. Some pets can be finicky, if this occurs consider hiding the drops in foods most pet’s love such as fish, chicken or yogurt or a favorite treat. If your pet only eats dry food then soak a few kibbles at feeding time.
For Best Results
Herbal dietary supplements are beneficial to the health and well-being of your pet and are safe for long-term use. Every pet responds to natural herbal supplements differently, therefore it is important to be consistent and administer the product daily. Supplements generally take two to four weeks to take effect, however this will vary from one animal to the next.
Product Storage
All NHV Natural Pet Products are pure herbal extracts and contain no artificial additives, preservatives or coloring. Shelf life after opening is 6 months and must be refrigerated after opening.
All information provided by NHV Natural Pet Products is for educational purposes only.
general wellbeing
Milk Thistle & BK Detox
bundle and save with pet expert kits
3 month supply for a small to medium size pet.
What is it?
Our Natural Detoxification Kit supports gentle detoxification of the liver, and other major organs to remove metabolic wastes and support healthy skin and blood.
How Does it Work?
Why Should I Trust It?
Vet-approved remedies that were carefully crafted with natural ingredients.
What is it?
Our Natural Detoxification Kit supports gentle detoxification of the liver, and other major organs to remove metabolic wastes and support healthy skin and blood.
How Does it Work?
Why Should I Trust It?
Vet-approved remedies that were carefully crafted with natural ingredients.
Anytime your furkiddo is battling an illness such as ezcema, psoriasis, arthritis, liver disease and more, they are likely suffering from a buildup of toxins in their blood. This buildup of toxins may exhaust the liver and kidneys (the waste management system) and leave your furkiddo’s body vulnerable to secondary infections (on top of the conditions they are dealing with). Our Detoxification Kit contains two of our remedies: BK-Detox and Milk Thistle. On their own, each remedy contains many beneficial properties but when combined, they work together to support healthy elimination and increased immune function.
Your vet may recommend specific medications for a health condition that your pet is battling. For added support alongside these vet-prescribed medications, we recommend NHV's Detoxification Kit to help improve their elimination of harmful wastes (that build up from illness) and help restore immune function. This supplement bundle contains BK-Detox and Milk Thistle. BK-Detox contains beneficial herbal ingredients like burdock, cleavers, and gotu kola to help flush toxic wastes from the liver, blood, and other vital organs. Milk Thistle contains silymarin which supports healthy functioning in the liver and kidneys (waste management center) and for promoting healthy skin and blood.
If your furkiddo is struggling with their health, know that you don't have to face it alone. We are here with our team of pet experts to help you every step of the way!
Made with the finest, organically grown, or ethically harvested herbs. Made specifically for pets, vet-formulated and vet approved.
Milk Thistle
BK-Detox
Select your pet's weight to determine the correct dose.
To be taken twice daily. Determine your pet’s weight and then use the easy chart below to determine the correct dose. This is the minimum dosage.
Pet's Weight Dosage
0 - 15 lb = 0.5 ml
16 - 30 lb = 1.0 ml
31 - 45 lb = 1.5 ml
46 - 60 lb = 2.0 ml
61 - 75 lb = 2.5 ml
Over 75 lb = 3.0 ml
How to Administer
Shake well before use. The easiest method is to use the dropper provided and place the drops into your pet’s food or favorite treat. You can also use the dropper and squirt directly into the pet’s mouth. Some pets can be finicky, if this occurs consider hiding the drops in foods most pet’s love such as fish, chicken or yogurt or a favorite treat. If your pet only eats dry food then soak a few kibbles at feeding time.
For Best Results
Herbal dietary supplements are beneficial to the health and well-being of your pet and are safe for long-term use. Every pet responds to natural herbal supplements differently, therefore it is important to be consistent and administer the product daily. Supplements generally take two to four weeks to take effect, however this will vary from one animal to the next.
Product Storage
All NHV Natural Pet Products are pure herbal extracts and contain no artificial additives, preservatives or coloring. Shelf life after opening is 6 months and must be refrigerated after opening.
All information provided by NHV Natural Pet Products is for educational purposes only.
Anytime your furkiddo is battling an illness such as ezcema, psoriasis, arthritis, liver disease and more, they are likely suffering from a buildup of toxins in their blood. This buildup of toxins may exhaust the liver and kidneys (the waste management system) and leave your furkiddo’s body vulnerable to secondary infections (on top of the conditions they are dealing with). Our Detoxification Kit contains two of our remedies: BK-Detox and Milk Thistle. On their own, each remedy contains many beneficial properties but when combined, they work together to support healthy elimination and increased immune function.
Your vet may recommend specific medications for a health condition that your pet is battling. For added support alongside these vet-prescribed medications, we recommend NHV's Detoxification Kit to help improve their elimination of harmful wastes (that build up from illness) and help restore immune function. This supplement bundle contains BK-Detox and Milk Thistle. BK-Detox contains beneficial herbal ingredients like burdock, cleavers, and gotu kola to help flush toxic wastes from the liver, blood, and other vital organs. Milk Thistle contains silymarin which supports healthy functioning in the liver and kidneys (waste management center) and for promoting healthy skin and blood.
If your furkiddo is struggling with their health, know that you don't have to face it alone. We are here with our team of pet experts to help you every step of the way!
Made with the finest, organically grown, or ethically harvested herbs. Made specifically for pets, vet-formulated and vet approved.
Milk Thistle
BK-Detox
Select your pet's weight to determine the correct dose.
To be taken twice daily. Determine your pet’s weight and then use the easy chart below to determine the correct dose. This is the minimum dosage.
Pet's Weight Dosage
0 - 15 lb = 0.5 ml
16 - 30 lb = 1.0 ml
31 - 45 lb = 1.5 ml
46 - 60 lb = 2.0 ml
61 - 75 lb = 2.5 ml
Over 75 lb = 3.0 ml
How to Administer
Shake well before use. The easiest method is to use the dropper provided and place the drops into your pet’s food or favorite treat. You can also use the dropper and squirt directly into the pet’s mouth. Some pets can be finicky, if this occurs consider hiding the drops in foods most pet’s love such as fish, chicken or yogurt or a favorite treat. If your pet only eats dry food then soak a few kibbles at feeding time.
For Best Results
Herbal dietary supplements are beneficial to the health and well-being of your pet and are safe for long-term use. Every pet responds to natural herbal supplements differently, therefore it is important to be consistent and administer the product daily. Supplements generally take two to four weeks to take effect, however this will vary from one animal to the next.
Product Storage
All NHV Natural Pet Products are pure herbal extracts and contain no artificial additives, preservatives or coloring. Shelf life after opening is 6 months and must be refrigerated after opening.
All information provided by NHV Natural Pet Products is for educational purposes only.
Published: September 10, 2026