Amino acid

N-Acetylcysteine

Amino acid studied for glutathione support, antioxidant defense, respiratory and liver support. How it works, the dose and timing studied, what it interacts with, and the research behind the grade.

Grade B evidence moderate: promising but smaller or mixed human trials Also known as NAC
All compounds
Best for Glutathione support, Antioxidant defense, Respiratory and liver support
Typical dose 600–1,200 mg daily
Timing Any time; with or without food
Category Amino acid
How it works

What it is and the mechanism

Provides cysteine, the rate-limiting amino acid for synthesizing glutathione, the body’s master antioxidant. It also breaks disulfide bonds in mucus and modulates glutamate, supporting respiratory, hepatic, and brain function.

Dose and timing

When and how much to take

The dose below reflects the range used in published research. Match the form alongside the milligrams. Set your own wake and bed times to map the timing onto your day.

Timing visualizer

When to take N-Acetylcysteine

Dose: 600–1,200 mg daily. Set your own wake and bed times to map the guidance onto your day.

12a6a12p6pDAY1 dose
12 pmAnytime. Timing is flexible. Pick a slot you can keep consistent.

These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease.

Before you stack it

Interactions and cautions

Read these before combining this with other supplements or medication. The risk is rarely the headline, it is the interaction you did not check.

Interactions
  • Nitroglycerin, additive vasodilation
  • Anticoagulants, theoretical additive effect
Cautions
  • Mild GI upset
  • Asthma, rare bronchospasm with inhaled forms
Stacking

What pairs well, and what to keep apart

Derived from shared topics, complementary categories, and the interaction list. Introduce one compound at a time so you can tell what works.

Keep apart from

No direct compound conflicts derived. Still check the interactions list above against your medication.

Explore more

Compounds in the same topics

Often considered alongside this one. Each carries its own evidence grade.