Cystine Dihydrochloride
Cystine Dihydrochloride is a salt form of the amino acid cystine, which plays a role in protein synthesis and cellular function. It is primarily used as a supplement in nutritional formulations and dermatological products. The dihydrochloride formulation enhances solubility for various pharmaceutical preparations.
Cystine Dihydrochloride is an amino acid supplement used primarily for hair, skin, and nail health, as well as in certain ophthalmic and metabolic applications.
Key facts at a glance
- RxNorm
- 2642207
- Generic
- Cystine Dihydrochloride
- Class
- pin-variant
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Used in nutritional supplements for hair, skin, and nail support; sometimes incorporated in dermatological formulations and ophthalmic solutions; may be prescribed for certain amino acid deficiency states or metabolic conditions involving cysteine metabolism.
As an amino acid salt, cystine serves as a building block for proteins in the body. It plays a role in maintaining the structure of keratin, supporting connective tissue health, and contributing to antioxidant defenses through its conversion to cysteine.
Generally well-tolerated when used as directed; oral supplements should be taken with adequate water; may interact with certain medications affecting amino acid metabolism; consult a healthcare provider before use if pregnant, nursing, or having metabolic disorders.
Official drug label
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy