VeriMomIs cystine safe during pregnancy?
Reviewed by VeriMom Editorial Team · Last reviewed
Pregnancy-Safe Ingredients Database — 28,000+ Ingredients Rated
cystine
NO KNOWN RISKS100
/100
0
Pregnancy-safe products containing cystine
DHC
DHC Protein Diet Beautiful Body - 300g
99/100
O Hui
O Hui The First Geniture Cell Essential Source
98/100
O HUI The First Geniture Cell Essential Source - 120ml
98/100
Asahi
Asahi Dear Natura Best 49 Amino Multivitamin & Mineral 50 Days Supply - 200 tablets
98/100
Asahi
Asahi Dear Natura Strong 39 Amino Multivitamin & Mineral Eco Pack Refill - 315 tablets
98/100
Lador
Lador Wonder Balm
98/100
Asahi
Asahi Dear Natura Strong 39 Amino Multivitamin & Mineral 50 Days Supply - 150 tablets
98/100
Asahi
Asahi Dear Natura Strong 39 Amino Multivitamin & Mineral 100 Days Supply - 300 tablets
98/100
Lador
Lador Wonder Balm - 50ml
98/100
O HUI The First Geniture Ampoule Advanced Passionate Ruby Edition - 1pack - 11items
98/100
Related ingredients
See also
Sources & references
Authoritative references used to score this ingredient.
Frequently asked questions
- Is cystine safe during pregnancy?
- Cystine (the oxidized dimer of cysteine, CAS 56-89-3) is a naturally occurring amino acid derivative with no harmonised reproductive classification at ECHA Annex VI, no CIR or SCCS safety flags for reproductive toxicity, and no credible peer‑reviewed evidence of teratogenicity or reproductive toxicity in the cosmetic/toxicology literature. Physiologically it is a normal dietary/biological component, not a known reproductive toxicant (sources: ECHA Annex VI — no harmonised CLP; PubChem summaries; PubMed literature searches showing no reproductive hazard).
- Is cystine safe while breastfeeding?
- No evidence that cystine poses reproductive or lactation-associated hazards; as an endogenous amino acid dimer it is not known to interfere with lactation or to concentrate in breast milk as a toxicant. No harmonised CLP or regulatory safety assessment (CIR/SCCS) indicates risk during breastfeeding (sources: PubChem, PubMed, CIR/SCCS absence).
- Is cystine safe for baby skin?
- No evidence of intrinsic reproductive or developmental toxicity for topical cystine. Absorption from skin for small, water‑soluble amino acids/dipeptides is generally low but measurable; because infant skin has higher surface‑area-to‑weight and a less mature barrier, exposure score is increased by +1. No infant‑specific hazards or studies indicating developmental effects were found (sources: CosIng listing; PubChem; general dermal absorption principles from peer‑reviewed literature).
- How does VeriMom score cystine?
- VeriMom scores cystine at 100/100 (no known risks) based on EU CosIng status, ECHA hazard classifications, and peer-reviewed PubMed studies. Our scoring pipeline is fully transparent.
- What are pregnancy-safe alternatives to cystine?
- See our curated list of pregnancy-safe alternatives to cystine based on similar function and a no-known-risks safety band.
Check every label in 2 seconds
Get VeriMom free — scan any product and see the pregnancy safety score instantly.
Medical Disclaimer
This information is for educational purposes only and does not constitute medical advice. Safety scores are based on publicly available data and may not reflect all risks. Always consult your healthcare provider before using any product during pregnancy or breastfeeding.