S-(Carboxymethyl)-L-cysteine, commonly known as Carbocysteine, is a high-performance mucoregulator and antioxidant derivative of L-cysteine. Specially engineered for the animal health sector, it serves as a critical additive in feed and breeding applications to maintain respiratory integrity and combat oxidative stress across various livestock and pet species.
By modulating mucus secretion and enhancing intracellular glutathione (GSH) levels, this advanced compound provides a sustainable solution for managing chronic respiratory conditions and improving overall growth performance. Its high safety profile and stable mechanism of action make it an ideal choice for preventive care in high-density farming environments and veterinary medicine.
| CAS Number | 2387-59-9 | Molecular Formula | C₅H₉NO₄S |
|---|---|---|---|
| Molecular Weight | 179.19 | EINECS NO. | 219-193-9 |
| Chemical Class | Mucoregulator / Antioxidant | Derivative Base | L-Cysteine |
| Primary Role | Respiratory Protection | Application Target | Animal Feed & Health |
| Mechanism | Mucus Regulation & GSH Boost | Safety Profile | High / Low GI Side Effects |
Regulates airway mucus secretion and reduces sputum viscosity, effectively protecting against chronic bronchitis and pneumonia.
Unlike rapid-acting agents, it provides long-term mucus regulation suitable for chronic disease management and preventive care.
Enhances glutathione levels to suppress pro-inflammatory cytokines, mitigating damage from ammonia or dust in poultry.
Clinical trials show that feed supplementation can improve broiler weight gain by 5-8% by reducing respiratory lesions.
Protects fish and shrimp against oxidative stress during transport or poor water conditions, increasing survival rates.
Offers a significantly lower risk of gastrointestinal side effects compared to acetylcysteine in monogastric animals.

Customized protocols for poultry (50-100mg/kg) and aquaculture (200-300mg/kg).
Seamlessly blends into standard feed and drinking water for effortless administration.
Strengthens mucosal immunity and enhances vaccine efficacy in porcine respiratory systems.
Strict adherence to Veterinary Drug Administration Regulations and global safety standards.
Optimized for use in pets, poultry, swine, cattle, and aquaculture species.
Can be paired with NAC to address both acute and chronic respiratory challenges.
| Metric | S-(Carboxymethyl)-L-cysteine | Acetylcysteine (NAC) |
|---|---|---|
| Action Speed | Sustained / Long-term | Rapid / Immediate |
| Mucus Mechanism | Indirect Regulation | Direct Disulfide Cleavage |
| GI Safety | High (Low Side Effects) | Moderate (May cause vomiting) |
| Primary Use | Preventive & Chronic Care | Acute Poisoning & Obstruction |
| Application | Daily Feed Supplement | Clinical Emergency Dose |
Carbocysteine regulates mucus production indirectly and acts more slowly, making it ideal for chronic prevention, whereas NAC directly breaks down mucus for acute relief.
By reducing respiratory lesions caused by ammonia exposure and oxidative stress, it allows broilers to maintain better health, leading to a 5-8% increase in weight gain.
Yes, it is recommended to avoid concurrent use with acidic agents such as Vitamin C or certain antibiotics like tetracyclines to ensure maximum efficacy.
Absolutely. Feed supplementation of 200-300 mg/kg helps mitigate oxidative damage during transport or in poor water quality, improving survival rates.
For dogs and cats, an oral dose of 10-15 mg/kg twice daily for two weeks is typically used to significantly reduce cough frequency.
It is not yet approved as a mainstream veterinary drug in the EU; users must follow local regional regulations and compliance guidelines.