N-Acetyl Cysteine, 575 mg 100 capsules

Dr. Clark Store SKU: 10424-100
Dr. Clark Store N-Acetyl Cysteine, 575 mg, 100 capsules
Dr. Clark Store N-Acetyl Cysteine supplement facts
Dr. Clark Store products are chemically pure, solvent free and additive free.
Dr. Clark Store products are tested for microbiology, heavy metals, and identity. We also test products for certain toxins using Dr. Clark’s biofeedback device called a Syncrometer.
Dr. Clark Store products are manufactured without flow agents like magnesium stearate, which interfere with nutrient absorption.
Gelatin capsules are a purer alternative to “veggie” capsules, which are made from tree pulp and chemicals. Our BSE and TSE free gelatin capsules are made with gelatin from cattle hide – never from bones.
Dr. Clark Store products are high quality, chemically pure, and made in GMP verified facility.

N-Acetyl Cysteine, 575 mg 100 capsules

Dr. Clark Store SKU: 10424-100
Regular price $18.49
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  • The Original Dr. Hulda Clark Products
  • Leader in Purity Since 1993
  • Certified and Audited GMP

  • Promotes antioxidant activity*
  • Respiratory aid*
  • Supports the body’s detoxification process*

N-acetyl cysteine (or NAC) is a derivative of the amino acid cysteine. NAC acts as a precursor to glutathione, a potent antioxidant compound made in the body. Glutathione’s strong antioxidant properties help prevent damage caused by oxidative stress and free radicals. Proper stores of glutathione support the immune system and help to neutralize toxins, including heavy metals.*

Trace minerals selenium and molybdenum provide extra support to glutathione’s many amazing properties.*

Taking NAC may be more beneficial than taking oral glutathione, as glutathione doesn’t fare well during digestion and isn’t well absorbed. Taking a glutathione precursor like NAC, however, allows for the production of intercellular glutathione, and NAC is readily absorbed during digestion.*

NAC has also been helpful in reducing symptoms of respiratory disorders, including coughing, wheezing and phlegm. NAC is particularly good at thinning thick phlegm. NAC binds to the sulfur in mucus and deteriorates the structure, making it easier to expel the mucus out the airways.* This feature makes NAC a great supplement to have around not just for cold and flu season, but for allergy season too.


N-acetyl cysteine, selenium (from SelenoExcell high selenium yeast), molybdenum (from molybdenum citrate), gelatin (bovine) capsule

Suggested Use
Take 1 capsule, preferably with a meal, or as directed by a healthcare professional.

Store at room temperature. Keep out of reach of children.


Frequently Asked Questions
Q: What is the capsule size?
A: Capsule size 0.

Q; What type of capsule does this product come in?
A: This comes in a gelatin capsule. The gelatin is derived from bovine hide (beef skin).

Q: What is the difference between L-cysteine and N-acetyl cysteine?
A: L-cysteine can be made in the body or it can be derived from protein-rich foods. N-acetyl cysteine (NAC) can only be obtained from supplement or pharmaceutical drug form. NAC can be broken down into L-cysteine once inside the body. While L-cysteine plays important roles in building vital proteins in the body, NAC is known for being a precursor to glutathione, the body's master antioxidant.

Q: Why does this product smell rancid?
A: NAC naturally contains sulfur, which has an unpleasant smell. The odor is harmless to you and does not affect the product in any way. To keep our products as pure as possible, we don't add any manufacturing agents to mask the smell.

Q: The capsules I received have colored specks in them. Is that normal?
A: Yes, the appearance is normal. Our NAC capsules also contain selenium and molybdenum. The selenium raw material that we use is tan in color and the molybdenum raw material that we use is white with light blue specks. Combining all three raw materials together gives an overall appearance of off-white with tan/brown and blue/grey specks scattered throughout the capsule. To keep our products as pure as possible, we do not add any agents that mask the true color of the raw materials we use.

*Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any diseases. As with any dietary supplement, you should consult with a qualified healthcare professional if you are pregnant or nursing, if you have any medical condition, or if you are taking any medication before using this product. Always consult with a healthcare professional before giving supplements to children. Please read full disclaimer here.
Coupon (discount) codes are not applicable on product subscriptions. The subscription price is already discounted from the one time purchase price.


All orders are shipped directly from our factory warehouse in Chula Vista, California. Orders received before 12PM Pacific Time ship the same day (excluding weekends and holidays). Orders received after 12PM Monday-Friday will ship the following business day. Your tracking number will be emailed from as soon as your order is shipped. 

For international shipments, duties and taxes may be applicable. By ordering from this website, you acknowledge that it is your responsibility to pay any duties and taxes.

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You can return any unopened or unused product within 30 days on the date on your invoice. Simply send the item back with a copy of your invoice. If you are unhappy with any consumable product, you may return an open item for a refund as long as at least 50% of the original contents remain and the return is done within 30 days of the date on your invoice.  

Please report any overages, shortages, or damages within 10 days of receiving your order.

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