NOW NAC (N-Acetyl Cysteine) 600 mg – Free Radical Protection, Maintains Cellular Health, With Selenium, 250 Capsules

What Is NOW NAC 600 mg?

NOW NAC (N-Acetyl Cysteine) 600 mg delivers a clinically meaningful dose of one of the most powerful and versatile antioxidant precursors in nutritional science. NAC is a stable, bioavailable form of the amino acid L-Cysteine — and most critically, the rate-limiting precursor to glutathione — the body’s master antioxidant and primary intracellular detoxification molecule. Every cell in your body produces glutathione, but its synthesis is limited by cysteine availability. By supplying NAC, this supplement directly fuels glutathione production in the liver, lungs, kidneys, and brain — supporting cellular defense, detoxification, and resilience at their most fundamental level. Enhanced with Selenium — an essential cofactor for glutathione peroxidase enzymes — this formula maximizes the functional activity of the glutathione system for comprehensive free radical protection.

The Glutathione Connection

Glutathione (GSH) is often called the “master antioxidant” because unlike vitamin C or E which are consumed when neutralizing free radicals, glutathione is continuously recycled by the body. It is the primary:

• Intracellular antioxidant — neutralizes reactive oxygen species (ROS) and reactive nitrogen species (RNS) inside cells where other antioxidants cannot reach
• Detoxification molecule — conjugates with toxins, heavy metals, drugs, and metabolic waste products in the liver for safe excretion
• Immune regulator — essential for optimal T-cell proliferation, NK cell activity, and cytokine balance
• Mitochondrial protector — the primary antioxidant defense inside mitochondria, protecting the cellular energy factories from oxidative damage

What Does NAC Support?

• Free radical protection — Boosts glutathione to neutralize ROS and protect cells from oxidative damage
• Cellular health — Maintains healthy cell membrane integrity and mitochondrial function through glutathione support
• Liver health & detoxification — NAC is used clinically (IV form) as the antidote for acetaminophen overdose due to its potent liver-protective glutathione-restoring effects
• Respiratory health — NAC has mucolytic properties — it breaks disulfide bonds in mucus, reducing viscosity and supporting healthy airway clearance
• Immune support — Glutathione is essential for optimal immune cell function and healthy inflammatory response
• Brain health & neuroprotection — NAC crosses the blood-brain barrier and supports glutathione levels in the brain, protecting neurons from oxidative stress
• Kidney protection — Studied for protection against contrast-induced nephropathy and heavy metal toxicity

Why With Selenium?

Selenium is an essential mineral and the catalytic cofactor for glutathione peroxidase (GPx) enzymes — the family of enzymes that use glutathione to neutralize hydrogen peroxide and lipid peroxides. Without adequate selenium, the glutathione you produce cannot be efficiently utilized by GPx enzymes. The combination of NAC (glutathione precursor) + Selenium (GPx cofactor) creates a synergistic antioxidant system that is functionally superior to either alone.

Who Should Take This?

• Individuals seeking powerful antioxidant and cellular protection
• Those supporting liver health and detoxification pathways
• People with respiratory conditions or high mucus production
• Anyone exposed to environmental toxins, heavy metals, or high oxidative stress
• Individuals supporting immune function and healthy aging
• Those seeking brain and mitochondrial neuroprotection

How to Use

Take 1 capsule 1 to 3 times daily with food, or as directed by your healthcare practitioner. Taking with Vitamin C may help maintain NAC and glutathione in their active, reduced forms. 250 capsules provides an exceptional value — up to a 250-day supply at 1 capsule per day.

Product Highlights

• 600 mg N-Acetyl Cysteine (NAC) per capsule — glutathione precursor
• With Selenium — essential GPx enzyme cofactor for glutathione activity
• Free Radical Protection — Cellular Health — Liver & Respiratory Support
• Crosses the blood-brain barrier — neuroprotective antioxidant support
• 250 Capsules — exceptional value, up to 250-day supply
• Non-GMO Verified
• Kosher
• No artificial colors, flavors, or preservatives
• Family Owned Since 1968