Ingredient guide · health

NAC

Glutathione precursor, liver & respiratory support

The clinically studied dose

600mg per day Clinical

Source: Examine.com — NAC — 600–1,800 mg/day; 600 mg is a standard single dose.

What it is

A precursor to glutathione, the body's master antioxidant. Used medically for the liver and lungs.

What the research supports

Antioxidant / glutathione support
Liver protection
Thins mucus for respiratory health
Researched for mental health

How it works

Supplies cysteine, the rate-limiting building block your body needs to make glutathione.

Side effects & safety

Generally safe. Occasional GI upset or unpleasant smell. Very well studied at pharmaceutical doses.

What it should cost

	Per serving
Typical branded single-ingredient product	$0.50
Bulk powder at the clinical dose (250g, $22.97)	$0.06

Buying bulk powder instead of a branded bottle saves about 89% per serving.

Bulk price: $22.97/250g → Alt source: $12.99/125g

Related ingredients

Educational only — not medical advice. Grades and clinical doses are computed from public labels against sourced research (citations on the main site); prices last verified 2026-07-21. Expensive Powder has no sponsors; bulk links may earn an affiliate commission, which never affects a grade. Talk to a clinician before starting any supplement.