Peak Supps N-Acetyl Cysteine (NAC) | 500 mg | 360 Capsules

Peak Supps N-Acetyl Cysteine (NAC) provides 500 mg per capsule in a pouch of 360 veggie capsules. It is designed to support glutathione, the most important antioxidant your body makes on its own. Rather than chasing symptoms like lingering fatigue, a sluggish liver, thick chest mucus or mental fog, NAC targets the cause behind them: a shortage of cysteine, the bottleneck in glutathione production. When glutathione runs low, oxidative stress builds up, the liver's detox work slows down and inflammation takes hold. This formula suits anyone whose daily life puts strain on glutathione, whether from sugar, alcohol, medications, pollution or stress. It is also a good fit for athletes and for people looking for liver and respiratory support. One pouch lasts 360 days at one capsule daily, or 180 days at two capsules daily.

What Is N-Acetyl Cysteine?

N-Acetyl L-Cysteine is a stabilised form of the amino acid L-cysteine. An acetyl group protects it from rapid oxidation and improves its stability and absorption. Cysteine is a sulfur-containing amino acid found in eggs, poultry, garlic and onions, but the specific NAC form is not available from food. Cysteine matters because it is one of the three amino acids your body uses to build glutathione, together with glycine and glutamine. It is usually the scarcest of the three, so it sets the limit on how much glutathione you can produce.

Benefits of N-Acetyl Cysteine

• Raises glutathione levels: NAC supplies the cysteine your cells need to make glutathione, the master antioxidant inside every cell.
• Supports the liver and detox pathways: The liver relies on glutathione to bind toxins, drug residues and alcohol by-products and prepare them for elimination.
• Thins mucus and supports breathing: NAC's sulfur group breaks the bonds that make mucus thick and sticky, so the airways clear more easily.
• Counters oxidative stress and inflammation: Higher glutathione helps neutralise the free radicals that damage cell membranes, proteins and DNA and fuel chronic inflammation.
• Supports mental balance and focus: NAC helps regulate glutamate, an excitatory neurotransmitter linked to stress, racing thoughts and poor concentration when it is out of balance.
• Supports insulin sensitivity: Oxidative stress is a hidden driver of insulin resistance, and reducing it helps cells respond to insulin more efficiently.
• Supports exercise recovery: Intense training increases free radical production in muscle, and glutathione helps manage that load so you recover faster.
• Supports immune function: Immune cells need a healthy glutathione reserve to work properly and protect themselves while fighting infection.

How N-Acetyl Cysteine Works in the Body

Think of glutathione as a defence system your cells keep recharging. It neutralises free radicals and gets used up in the process, so it has to be recycled or rebuilt. Many everyday factors drain it faster than it can be made:

• refined sugar and blood sugar swings
• alcohol and smoking
• pollution
• chronic stress
• poor sleep

The liver is both the biggest producer and the biggest consumer of glutathione. Common medications, especially paracetamol (acetaminophen), deplete liver glutathione directly.

NAC works in several ways:

• It converts to cysteine, filling the weak link so cells can produce glutathione again.
• Its thiol (sulfur) group acts as a direct antioxidant.
• The same thiol group breaks down the sulfur bonds in thick mucus.
• In the brain, it supports a system that controls glutamate release, helping balance stimulation and calm.

With glutathione restored, inflammation eases. Many people notice this in daily life as steadier energy, lighter digestion after rich meals and a clearer head.

What boosts results: the right co-nutrients.

• Glycine and glutamine complete the glutathione molecule.
• Selenium powers the enzyme glutathione peroxidase.
• Vitamin B2 helps recycle used glutathione.
• Vitamin C helps keep glutathione in its active form.
• Magnesium supports the energy needed to make it.
• Sulfur-rich foods support the same pathway, including eggs, garlic, onions and cruciferous vegetables like broccoli and cabbage.

What reduces results: excess sugar and refined carbs, alcohol, chronic stress with high cortisol, and short sleep. All of these burn through glutathione quickly and cancel out part of NAC's support.

What Makes This Formula Stand Out

Peak Supps delivers 500 mg of NAC per capsule, a flexible strength. Take one capsule daily for foundational support or two for a stronger intake. The capsule shell is plant-based Hydroxypropyl Methylcellulose (HPMC) instead of gelatin, so it suits vegetarians and vegans. The formula is clean: a single active ingredient, with only magnesium stearate added as a flow agent. It is Non-GM and lists no allergens. The 360-capsule pouch is built for consistent, long-term use, which is what glutathione support needs because its effects build over time.

Who Is This Product For?

• People who want to support the liver and detox pathways, especially with regular sugar, alcohol or medication use.
• Anyone dealing with thick mucus or recurring chest and sinus congestion who wants clearer breathing.
• People with ongoing fatigue or brain fog linked to stress and oxidative load.
• Athletes and physically active people looking for recovery support.
• Those working on insulin sensitivity and inflammation alongside a low-sugar diet.
• Vegetarians and vegans who want a plant-based capsule.

How to Use

Take 1 capsule, 1-2 times daily with water, as directed on the label. Do not exceed the recommended daily dose. NAC is best absorbed on a relatively empty stomach, about 30 minutes before a meal. If your stomach is sensitive, take it with food instead. If you take two capsules a day, spread them between morning and evening to keep a steady supply of cysteine. To get more from it, stay well hydrated and include foods rich in selenium, glycine and vitamin C. Consistent daily use matters more than exact timing.

Product Details

• Active ingredient: N-Acetyl L-Cysteine (NAC).
• Strength: 500 mg per capsule (1000 mg per two capsules).
• Form: Veggie capsule (HPMC).
• Count: 360 capsules.
• Other ingredients: Capsule Shell (Hydroxypropyl Methylcellulose 'HPMC'), Flow Agent (Magnesium Stearate).
• Free from: Non-GM, no allergens, suitable for vegetarians and vegans.
• Brand: Peak Supps, United Kingdom.

Frequently Asked Questions

What is the difference between NAC and taking glutathione directly?

Glutathione is a large molecule, and part of it is broken down in the digestive tract before it can be absorbed. NAC supplies cysteine, the raw material in shortest supply, so your cells can build glutathione themselves. That makes NAC one of the most dependable ways to support glutathione levels.

Is NAC good for the liver?

The liver depends on glutathione for phase 2 detoxification, where it binds toxins, drug residues and alcohol by-products for removal. NAC helps replace the glutathione the liver uses up, which is why it is one of the best-known liver support supplements.

When is the best time to take NAC?

Take 1 capsule of Peak Supps NAC, 1-2 times daily with water. Taking it shortly before a meal may help absorption, or take it with food if your stomach is sensitive. If you take two capsules, split them between morning and evening.

Why do NAC capsules smell like sulfur?

NAC contains sulfur, which is exactly what lets it support glutathione and break down mucus. A mild sulfur-like smell is normal and does not mean the product has gone bad.

Caution

Consult a doctor if pregnant, breastfeeding or taking long-term medication.