Fragrance avoidance
Not a strong fit for fragrance avoidance because it carries Fragrance.
The ingredient itself is a fragrance-linked signal, so it is better treated as an avoid case when fragrance exposure is the main concern.
Cystine
EPA CPDat observed this chemical in 13 composition records across product categories including Personal care.
Research docs0Claims0Sources5FunctionAnti-static agent • DeodorizerIdentifierDTXSID50859005
Concern score
Not assessed — no hazard data yet.
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 · limited confidence.
Where it appears
Prevalence of Cystine in our catalog (epa_cpdat).
Products
13
Brands
6
Personal care
Typical roles
Anti-static agentDeodorizerFillerFlavouring and nutrientFragranceSoftener and conditioner
Catalog
Found in these products
Suitability
Context-specific fit derived from published classifications and the current ingredient evidence profile.
Avoid
Evidence read
The published evidence profile currently shaping this ingredient record.
No evidence profiles are attached to this ingredient yet.
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 13 composition records across product categories including Personal care. EPA CPDat classifies this chemical for functional uses including Softener and conditioner, Anti-static agent, Fragrance.
Effective: September 2013View source →
US
FDA
FDA NDC lists this ingredient in 1 active drug products and 2 total products.
Effective: 2026-12-31View source →
US
FDA
