Is Silk Amino Acids natural?

Q: Is Silk Amino Acids natural?

Silk Amino Acids has a Natural Origin Index (NOI) of 1.00 (scale 0–1) per ISO 16128. Silk protein hydrolysate is composed entirely of natural-origin amino acids. An NOI of 1.00 means 100% of its molecular mass is traceable to a natural, renewable source.

Yes. Silk protein hydrolysate is composed entirely of natural-origin amino acids.

INCI nameSilk Amino Acids

CAS96690-41-4

FunctionHair Conditioning · Humectant

FeedstockProduced by hydrolysing silk fibroin protein from silkworm…

How we scored it

Protein hydrolysate of silk; hydrolysis leaves only natural amino acids → 1.0.

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

Produced by hydrolysing silk fibroin protein from silkworm cocoons into free amino acids. No synthetic route.

In plain English

Amino acids from breaking down silk protein from silkworm cocoons. Used as a conditioning and moisturising ingredient in hair and skin products.

CosIng definition: Protein hydrolyzates, silk

References

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.
2SILK AMINO ACIDS. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
3SILK AMINO ACIDS. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=SILK%20AMINO%20ACIDS