Database/Skin Conditioning/Cystine Bis-PG-Propyl Silanetriol
Mostly petroleum · ISO 16128

Is Cystine Bis-PG-Propyl Silanetriol natural?

Mostly not. The natural amino-acid cystine core is outweighed by two petrochemical propylene-glycol/silane modifier groups attached at both carboxyl ends.

INCI nameCystine Bis-PG-Propyl Silanetriol
FunctionSkin Conditioning
FeedstockMade by esterifying the natural amino acid L-cystine…

How we scored it

Cystine (natural, MW~240) esterified at both ends with PG-propyl silanetriol groups (~178 Da each, petrochemical/silicone). Est. 238 natural / (238+356) total ≈ 0.40.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.

Where it comes from

Made by esterifying the natural amino acid L-cystine with a petrochemical propylene-glycol-linked silanetriol coupling agent at both ends. No molecular weight is given in the source data, so the split is estimated from typical substituent sizes.

In plain English

A skin-conditioning ingredient combining the amino acid cystine with a silicone-like modifier that helps it bind to hair or skin. The amino acid is naturally derived; the modifier is synthetic.

CosIng definition: L-Cystine, diallylglycidyltrihydroxymethylsilyl ester

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References

  1. 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
  2. 2CYSTINE BIS-PG-PROPYL SILANETRIOL. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
  3. 3CYSTINE BIS-PG-PROPYL SILANETRIOL. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=CYSTINE%20BIS-PG-PROPYL%20SILANETRIOL