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L-Cysteine
Hydrochloride

Moderate study situation·7/10
A higher score indicates better study conditions, but not necessarily effectiveness.

A supplemental amino acid supporting antioxidant production, detoxification, and respiratory function.

AntioxidantLiver HealthRespiratory Health
dose range
500–1500 mg
Divided into 2–3 doses daily.
Consumption
Take with meals for best absorption and stability; may be combined with vitamin C.
Not fat-soluble.
Best time
Typically taken with morning and midday meals.

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Description

L-Cysteine Hydrochloride is a salt form of the non-essential amino acid L-cysteine, used in supplements to support glutathione synthesis, antioxidant defenses, and respiratory health. It is naturally present in protein-containing foods and applied in clinical and wellness settings.

benefits
Main effects with level of evidence
Moderate
Note on evidence

Evidence is robust for use in acetaminophen toxicity; moderate as antioxidant support and mucolytic. Limited long-term studies for general supplementation.

Antioxidant Support via Glutathione Production

Moderate

Acts as a precursor to glutathione, a major antioxidant protecting cells from oxidative stress.

Particularly relevant for: adults · individuals seeking oxidative stress reduction
1 · PubMed

Adjunct in Acetaminophen Overdose

Strong

Used in clinical settings to replenish glutathione and protect the liver in acetaminophen toxicity cases.

Particularly relevant for: patients with acetaminophen overdose (clinical setting only)
2 · NIH LiverTox

Respiratory Health and Mucolytic Effects

Moderate

Helps thin mucus, supporting management of conditions like chronic bronchitis and COPD.

Particularly relevant for: individuals with chronic respiratory conditions
3 · PubMed

Last updated:

This information is for educational purposes only and does not replace medical advice.
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This website is for educational and informational purposes only and does not constitute medical advice or professional services. The information provided should not be used to diagnose or treat any health problem or disease. Persons requiring medical advice should consult a licensed physician.