Glutathione vs. NAC: A Comparison of These Antioxidants

Which is better: glutathione or NAC? We explore the science behind both of these potent molecules to help you determine which will best help support your furry friend's health.

Key Takeaways

NAC and glutathione are both powerful antioxidants with plenty of potential health benefits.
Glutathione is often called the body's "master antioxidant," and can help support liver health and protect the body from oxidative stress.
NAC has its own benefits, but it is also a crucial precursor to glutathione and can help boost glutathione production.

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NAC vs. Glutathione

Sean Zyer, founder of Earth Buddy, says:

"Glutathione and NAC are both potent antioxidants with powerful potential health benefits. Glutathione is known as the 'master antioxidant' that is produced naturally by the body. NAC is a precursor to glutathione that can help boost glutathione production."

You've likely heard of the benefits of antioxidants. These molecules help protect cells from reactive molecules called free radicals, which, in high concentrations, can cause oxidative stress.

There are many different kinds of antioxidants, each with slightly different potential benefits. Two of the most useful are glutathione and NAC.

Glutathione and NAC are both crucial for overall wellness, and each has various potential health benefits. But they work in different ways.

Glutathione is naturally produced by both humans and dogs.¹ It helps protect your dog's cells against free radicals, supporting liver health and the immune response.

NAC also naturally occurs in both humans and dogs. It has its own potential benefits, but in the context of antioxidant protection, it is known for being a precursor to glutathione.

Both glutathione and NAC are available as supplements. But which is better, or most appropriate for your furry friend? To figure that out, we need to explore how both work.

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Understanding Glutathione

Glutathione Production

Glutathione is a tripeptide, which means it's formed of three amino acids: cysteine, glycine, and glutamic acid. It's one of the most abundant molecules of its kind in the body.³

Glutathione is produced mainly by cells in the liver. But it has important functions throughout the body.⁴

The Importance of Maintaining Glutathione Levels

Research has connected glutathione levels with various markers of overall wellness. In humans, studies have linked reduced glutathione levels with many different health conditions.⁵

Studies have found the same for dogs and cats, too.⁶ For example, one study found that unwell dogs had lower levels of glutathione.⁷

If low glutathione levels are connected with poor health outcomes, you can start to see why maintaining glutathione levels is so important.

Dogs naturally produce glutathione, but levels usually start to decline with age.⁸

How to Promote Glutathione Levels

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One way to boost glutathione levels is through diet. Various foods are rich in the compounds your dog's body needs to create glutathione. Examples include beef liver, cruciferous vegetables, and mushrooms.⁹

Certain ingredients or nutrients have also been shown to support glutathione production. Examples include vitamin C, vitamin E, selenium, and milk thistle.

Another way to support glutathione levels is through supplements. One dietary supplement that can help is glutathione supplements. We'll discuss those later. Another option is NAC supplements.

Understanding N-Acetyl Cysteine (NAC)

NAC stands for N-acetyl cysteine. It's an amino acid.

NAC has various potential health benefits. It's widely used to help thin out mucus, for detoxification, and for its antioxidant properties.¹⁰

But one of NAC's most powerful potential benefits is the fact that it is one of the key ingredients in glutathione. In fact, one 2023 study noted that "NAC's primary role is to replenish glutathione stores."¹¹

Remember, glutathione is composed of three amino acids. NAC is a precursor of the amino acid L-cysteine, which itself is one of the three amino acids that form glutathione.¹²

NAC supplements are therefore widely used to help support glutathione levels. For example, a 2026 review of hundreds of scientific articles concluded that NAC supplementation helps increase glutathione levels in animal models.¹³ Earlier studies similarly found that NAC supplementation can help boost glutathione levels.¹⁴

Potential Health Benefits of Glutathione/NAC

Glutathione (and NAC, as a glutathione precursor) has many potential health benefits. They include supporting liver function, enhancing the immune response, managing oxidative stress, and more.

Immune System

Research has shown that glutathione plays a key role in immune function. In fact, glutathione levels seem to help support a healthy immune response.¹⁵

For example, one study found that glutathione helps "fine-tune the innate immune response."¹⁶ Another study found that glutathione supplementation enhanced markers related to immune response.¹⁷

In part, this potential benefit is because of glutathione's antioxidant properties. As we mentioned, glutathione is known as the body's 'master antioxidant.' It helps neutralize free radicals and protect cells against oxidative damage, which can cause various problems, including those related to the immune system.

Liver Function

Another powerful potential benefit of glutathione is helping maintain normal liver function.

The liver is a crucial site of detoxification. By supporting hepatic function, glutathione can therefore help support your dog's normal detoxification processes.

For example, one study found that glutathione supplements helped reduce liver toxicity in dogs.¹⁸

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Brain Function

As a powerful antioxidant, glutathione can also support normal brain and nerve function. Your dog's central nervous system is particularly susceptible to damage by free radicals, which makes glutathione especially important.¹⁹

"The nervous system, because it is that master control system … is this amazing highway of information and communication," explains Dr. Casara Andre in conversation with Earth Buddy founder Sean Zyer. "It really is the one that is sending information to all the other systems about whether they should panic or not panic.… So if we can get the nervous system in line, we have a much easier time at directing all of these other systems."

Where to Get Glutathione Supplements

When choosing a new supplement regimen, make sure to focus on quality. One way to check for quality is to see whether a manufacturer submits its products for testing. For example, all of Earth Buddy's supplements, including Hemp Dog Treats and CBD-Based Oils, are tested for potency and safety.

One great option for glutathione supplements is Earth Buddy's Maxx Life Glutathione for Dogs. It blends a glutathione support complex with an immune support complex with several key nutrients, like vitamin C, which can support immune function and help boost glutathione production.

Liposomal Glutathione

Another excellent option is Earth Buddy's first-of-its-kind Liposomal Glutathione for Dogs. It contains liposomal glutathione and NAC, plus other supporting ingredients.

Liposomal glutathione is glutathione that has been encapsulated in small bubbles of lipids, or fats. These fat bubbles help protect the glutathione from your dog's digestive system, helping to ensure more of the glutathione is actually delivered to your dog's cells.

Earth Buddy's Liposomal Glutathione also contains L-lysine and milk thistle. As we mentioned, research suggests milk thistle can also support the body's natural production of glutathione. These ingredients can also promote liver detoxification, especially alongside NAC and liposomal glutathione.

Functional Mushrooms

As we mentioned, some mushrooms have been found to help boost glutathione levels. Certain functional mushrooms also contain other antioxidants that can further support glutathione's potential health benefits.

For example, one study found that supplementation with reishi mushroom extract caused an increase in glutathione.²⁰ Another study found a similar result for cordyceps mushrooms.²¹ Yet another study found the same for lion's mane.²²

Earth Buddy's Organic Mushrooms blend five powerful functional mushrooms: reishi, cordyceps, lion's mane, turkey tail, and agarikon.

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Conclusion

Both NAC and glutathione are powerful antioxidants with plenty of potential health benefits. Glutathione is the body's 'master antioxidant,' and can help support liver function, normal detoxification processes, and protect cells against oxidative damage.

NAC is a precursor to glutathione, and can therefore help boost glutathione synthesis — potentially leading to all of the benefits associated with glutathione.

Frequently Asked Questions

Can Dogs Take Glutathione and NAC Together?

Yes! NAC is a precursor to glutathione, so it's fine to take it alongside glutathione. However, it's best to take them in a combined supplement with tailored levels of each ingredient, like Earth Buddy's Liposomal Glutathione.

What Is Better Than Glutathione?

That depends on what your goal is. For overall protection against oxidative damage, glutathione is hard to beat; there's a reason it's called the 'master antioxidant.'

One of the advantages of NAC is that it tends to survive digestion better than glutathione. However, encapsulating glutathione in lipid bubbles, as in Earth Buddy's Liposomal Glutathione, can help promote its digestion.

Which Foods Are High In Glutathione?

Foods aren't rich in glutathione, but instead can be rich in compounds that help the body produce glutathione. Examples that are safe for dogs include beef liver, poultry, fish, and cruciferous vegetables like broccoli and Brussels sprouts. Always make sure to use them as part of a healthy, balanced diet.

Keep Reading: Valley Fever in Dogs: What to Look For

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Earth Buddy is an environmentally conscious and family-owned company dedicated to providing natural solutions for pets. From our CBDa Oils for Pets to our colostrum supplements, our products are designed to promote calmness and encourage relaxation for our furry friends. To learn more and stay connected, follow us on Facebook, Instagram, LinkedIn, YouTube, and Pinterest.

Glutathione vs. NAC: A Comparison of These Antioxidants

Key Takeaways

NAC vs. Glutathione