Milk Thistle

Organic Milk Thistle for Dogs & Cats — Daily Liver + Detox Support

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Mainly used for its benefits to the liver, Milk Thistle acts as both a protectant and detoxifier. It has demonstrated positive impacts like flushing out harmful toxins from medications, antibiotics, free radicals and heavy metals. By helping the body filter out unnecessary or harmful particles, Milk Thistle provides many benefits, like providing extra support for the allergic dog, supporting skin health, and boosting the normal function of other vital organs like the kidneys, pancreas, and gallbladder.

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Backed by the NASC Seal + 100% Quality Guarantee

Liver Support
Allergy Season
Detoxifying After Medications
Flea & Tick / Heartworm Support
Daily Detox (Pesticides, Heavy Metals, Environmental Toxins)

Single-Ingredient, Pure Ground Milk Thistle Seed

USDA Organic Whole Seed

Naturally Occurring Fiber + Micronutrients

No Fillers or Additives

Used Clinically For Decades

Why Whole-Seed Milk Thistle?

Most brands use extracts or flavored chews. We use whole seed, and here’s why:

• Whole seed contains 5x more beneficial plant compounds than the extract alone
• Includes fiber, antioxidants, micronutrients, and healthy fats
• Extract-only products can be harsh or cause digestive upset
• Whole seed is gentle enough for long-term, daily use
• No binders, flavors, glycerin, or preservatives

This is Milk Thistle the way your dog’s liver prefers it.

For Liver Support

Milk thistle helps maintain normal liver function, supports healthy liver cells, and contributes to the liver’s essential role in processing everyday environmental stressors.

For Allergy Season

During seasonal challenges, the liver works harder. Whole-seed milk thistle supports the body’s natural detox pathways and helps maintain normal immune responses — especially when allergens are high.

For Detoxification Support

Medications, anesthesia, antibiotics, and heartworm preventatives all tax the liver. Whole-seed milk thistle helps maintain normal detoxification processes and supports healthy elimination via the liver, gallbladder, and digestive tract.

For Digestion & Gut Support

The liver and digestive system work hand-in-hand. Milk Thistle helps the liver metabolize nutrients, promoting smoother digestion and overall wellness.

For Flushing Out Toxins

From lawn chemicals to heavy metals to everyday pollutants—our pets encounter more toxins than ever. Naturally occurring antioxidants in whole seed milk thistle help the liver process oxidative stress and environmental toxins encountered day-to-day.

Just One Ingredient

Ingredients: Organic Ground Milk Thistle Seed

Organic Ground Milk Thistle Seed

Nothing added. Nothing extracted. Just whole organic seed, which naturally contains beneficial fiber, antioxidants, vitamins + minerals, and ~3% silymarin.

Silymarin Math ▼

¼ teaspoon = 550mg of ground milk thistle = 16.5mg of silymarin

- There is approximately 3% silymarin (based on the dry weight of our Milk Thistle) per serving size (1/4 tsp).

- A ¼ teaspoon contains 550mg of our pure, organically grown Milk Thistle
(550mg = ¼ teaspoon)

- So, take 550 mg and multiply by .03 (the amount of our active ingredient, silymarin)
550x.03=16.5

- There would be about 16mg to 17mg of silymarin in each ¼ teaspoon.

Milk Thistle

vs The Rest

Many milk thistle products use extracts, liquids, or multi-active formulas. Herbsmith Milk Thistle uses the whole organic seed, providing gentle, food-based liver support plus naturally occurring fiber, vitamins, minerals, and antioxidants. This gives pets well-rounded, daily support without fillers, flavors, glycerin, alcohol, or synthetic additives.

Liver support for daily use

Whole organic milk thistle seed

Naturally includes fiber + micronutrients

Single-ingredient liver support

No extracts, flavors, or additives

Vet Formulated & Owned

Whole plant value

Seed + fiber + natural plant oils

Extract-focused active only

Daily value

~$0.47/day in 500 g size

~$1.50/day

Directions

Dogs

>0 – 7lbs 1/16 tsp twice a day (8.25mg of Silymarin daily)

8 – 14lbs ⅛ tsp twice a day (16.5mg of Silymarin daily)

15-30 lbs ¼ tsp twice a day (33mg of Silymarin daily)

31-80 lbs ½ tsp twice a day (66mg of Silymarin daily)

81-120 lbs ¾ tsp twice a day (100mg of Silymarin daily)

>120 lbs 1 tsp twice a day (132mg of Silymarin daily)

Cats

Adults ⅛ tsp twice a day (16.5mg of Silymarin daily)

Cautions

Not to be used in pregnant pets. If animal’s condition worsens or does not improve, stop product administration and consult your veterinarian. Not for use within 48 hours of surgery or anesthesia.

If your veterinarian recommends a smaller dose of milk thistle, those dosages are often based on milk thistle concentrated extract. Our milk thistle is whole ground seed of milk thistle and because we use the whole seed, there’s 5x more volume of powder than concentrated extract. So, while our daily recommendations are higher, there’s still a comparable amount of active ingredient (3%) needed to be effective.

How to Feed

You can sprinkle the recommended amount right over every meal, or you can feed it as a treat– scoop the proper dosage into a small meat patty and roll it up, mix the powder with a small amount of cottage cheese or coconut oil and serve.
Or put the recommended scoop into an ice cube tray, add water or broth, and freeze.

Why Give it Every Day?

The liver works continuously, processing food, environmental stressors, and everyday metabolic byproducts. Consistent support keeps these natural pathways functioning smoothly.

Tested. Trusted. Vet-Approved.

Herbsmith takes a trust-but-verify approach to every formula. From carefully sourced herbs to the final product, each ingredient is tested for purity, potency, and authenticity. Our cGMP facility, owned and operated by Dr. Chris Bessent, follows strict processes designed to meet the highest safety standards while independent third-party labs confirm what’s on the label is exactly what’s in the bottle. With the NASC Quality Seal and rigorous in-house checks, you can feel confident that the final product is safe, consistent, and worthy of your pet’s bowl.

cGMP Certified Facility

Made in our own facility under veterinary oversight. Every batch meets the highest safety and quality standards—because your pet deserves nothing less.

NASC Seal of Aproval

Independently verified to exceed industry standards. This seal isn't given lightly—it's earned through rigorous quality control and testing.

Responsibly Sourced

We partner only with cGMP-compliant suppliers committed to sustainability and conservation. Trust but verify—it's our promise to you.

Frequently Asked Questions

Product Questions

Is milk thistle safe for puppies and kittens?

Absolutely! Every age, breed, and size can benefit from an occasional or even daily detox, so get your proactive care on.

Why are your Milk Thistle dosages different from others on the market?

Extract-based products are measured by concentrated silymarin. We use whole seed, which naturally contains: 3% silymarin Fiber Antioxidants Vitamins + minerals This means a larger scoop equals the same active amount, plus whole-food benefits.

What’s the silymarin content?

Whole milk thistle seed naturally contains ~3% silymarin. Each dose provides approximately 8–132 mg depending on pet size.

Can I really give Milk Thistle to my pet every day?

Yes, Dr. Bessent's used Milk Thistle long-term in her veterinary practice for many years. Milk Thistle is proven to be most effective when given before exposure to environmental stressors, so ongoing liver support is the most beneficial.

When should I use Milk Thistle?

Allergy season After medications Before and after flea/tick preventatives Daily detox Digestive and liver health support Senior pets needing liver resilience

Can I use Milk Thistle with other supplements or prescriptions?

Yes. It's safe to use alongside most medications and supplements, but always consult your veterinarian if your pet has a chronic condition.

Order Questions

When will my order ship?

All orders are shipped within 1-2 business days.

What is the 100% Product Quality Guarantee?

We stand behind the quality of each and every product that goes out our doors. If the product you receive isn’t quite up to snuff, please reach out.

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Milk Thistle