howtosupplement
Inflammation/Hormonal/Mood

N-Acetyl Cysteine

Acetylated cysteine derivative that replenishes glutathione and may help mucus-heavy respiratory issues, inflammation, and PCOS.

N-Acetyl Cysteine

N-Acetyl Cysteine

59
score
B
evidence
Caution
risk
Quick Take

Useful in a few niches, especially mucus-heavy respiratory issues and PCOS — optional, not foundational, for healthy adults.

N-acetyl cysteine is an acetylated form of cysteine. NAC itself is supplemental, while cysteine comes from protein-rich foods like poultry, eggs, dairy, and legumes. It helps rebuild glutathione, a major intracellular antioxidant, and breaks disulfide bonds in mucus so thick secretions are easier to clear. Best-supported uses are fewer respiratory flare-ups in chronic bronchitis/COPD, lower oxidative or inflammatory markers, and improved ovulation or insulin markers in some women with PCOS. It tends to help specific subgroups more than the average healthy adult.

Proven Benefits

01
Reduces respiratory flare-ups
02
Improves ovulation in PCOS
03
Lowers CRP/oxidative stress
04
May improve semen quality
05
May reduce compulsive urges
06
May improve insulin sensitivity
07
May ease depressive symptoms

Protocol

Amount
600-1200 mg
Frequency
Once or twice daily
When
Any time of day — take with food if it causes nausea.

Onset Time

2-4 weeks for mucus symptoms; 8-12 weeks for biomarkers

Who Should Consider

Adults with frequent thick-mucus respiratory symptoms
Women with PCOS discussing supplements with a clinician
Men undergoing fertility evaluation
Adults seeking adjunct help for compulsive urges

Food Sources

  • Poultry (~250-300 mg cysteine per 100 g)
  • Eggs (~130 mg cysteine per large egg)
  • Greek yogurt (~200-250 mg cysteine per 170 g)
  • Lentils (~120-180 mg cysteine per cooked cup)
  • Sunflower seeds (~150-200 mg cysteine per 30 g)

How It Works

NAC supplies cysteine, the rate-limiting building block for glutathione, which helps cells neutralize reactive oxygen species. It also cleaves disulfide bonds in mucous glycoproteins, thinning thick secretions. In the brain, NAC may modulate glutamate signaling, which is why it is studied in compulsive and mood disorders.

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