Food use
Food-use source coverage is present in the current record.
The ingredient appears in food-oriented source coverage or allowed-use references, which makes food use easier to support than a context with no domain signal at all.
L-Cystine
EPA CPDat observed this chemical in 9 composition records across product categories including Laboratory supplies, Industrial products, Personal care.
Research docs0Claims0Sources5FunctionActive ingredient • Anti-static agentIdentifierDTXSID2046418
Concern score
5/100Low concern based on regulatory listings.
Well researched
How we scored this
The concern value reflects this ingredient's chemical identity — its hazard profile from the published classifications and regulatory status below — not the safety of a product it appears in. A score near 40 is the baseline for ingredients with no specific signal (water scores 40 by design), so a mid-range value is not a safety verdict.
Concern score 5/100 (low) · high confidence.
Where it appears
Prevalence of L-Cystine in our catalog (epa_cpdat).
Products
9
Brands
4
Laboratory suppliesIndustrial productsPersonal careFood and drug
Typical roles
Active ingredientAnti-static agentDeodorizerFillerFlavouring and nutrientSoftener and conditioner
Catalog
Found in these products
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Good fit
Fragrance avoidance
No fragrance-linked caution surfaced in the current profile.
Linked research
Primary documents currently linked to this ingredient record.
No linked research documents are attached to this ingredient yet.
Extracted claims
Structured claim signals pulled from linked ingredient research.
No extracted claims are attached to this ingredient yet.
Regulatory status
Published jurisdiction-level classifications and regulatory designations for this ingredient.
US
EPA
EPA CPDat observed this chemical in 9 composition records across product categories including Laboratory supplies, Industrial products, Personal care. EPA CPDat classifies this chemical for functional uses including Active ingredient, Anti-static agent, Deodorizer.
Effective: November 2014View source →
US
FDA
openFDA substance registry classifies this ingredient as chemical.
Effective: 2026-05-24View source →
