Cosmetics Peptide Silk-C Serum (2019 formulation) safety rating

Cosmetics Peptide Silk-C Serum (2019 formulation) safety rating | Greenlens

Raters split

Ingredient safety

A 58-point gap between the two loudest voices.

42Greenlens Precautionary ScreenIndependent

100Greenlens Tolerance ScreenIndependent

050100

See why, ingredient by ingredient

All 2811 cleaner options, safest first We show the best 12, including the strongest on each axis.

Every rater, every axis

Ingredient safety

58 pts apart

Independent — not funded by the brands it rates. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →
Independent — not funded by the brands it rates. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →
Independent — not funded by the brands it rates. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →

Also screened, nothing found: ANSES Endocrine Disruptors · ECHA SVHC Candidate List · California Proposition 65 · US NTP Report on Carcinogens · EU Harmonised Classification (CLP Annex VI) · Health Canada Ingredient Hotlist · IARC Monographs

Environmental

Also screened, nothing found: EU Microplastics Restriction

Labor

Run by a nonprofit. Auto-linked to this product, not yet human-reviewed. Checked this week. about this rater →

Coverage & match quality

4 ratings · 2 of 4 axes

Some ratings rest on an automatic match that has not been human-reviewed.
Fewer raters reach smaller-brand products, so a missing rating is not a clean bill of health, only a gap.

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composite recomputes live

Ingredient safety1.0×

Environmentalno rating

No rater covers this axis for this product, so its weight can't move the score.

Labor1.0×

Packagingno rating

No rater covers this axis for this product, so its weight can't move the score.

0 means ignored. Higher = more weight in your composite.

Ingredients, decoded

Data availability

Good14 of 20 characterized

Our sources have reference data on 14 of 20 listed ingredients; 6 are uncharacterized in our data — a gap, not a clean bill.

Worth a look (2)

Fragranceundeclared fragrance blendperfumingraters disagree
Undisclosed fragrance blend

What these ingredient tags mean (4)

These describe what an ingredient is, not whether it is a problem. The stance marks above are the ratings; these are not.

common irritantPropylene Glycol
- Propylene Glycol: A solvent that shows up in patch-test clinics, more often as irritation than as allergy. American Contact Dermatitis Society, Allergen of the Year 2018 (Jacob SE, Scheman A, McGowan MA, Dermatitis 2018;29(1):3-5).
undeclared fragrance blendFragrance
- Fragrance: A blend the label does not itemize, so what is in it cannot be read from the ingredient list. EU Regulation (EC) 1223/2009 permits the collective term "parfum"; the SCCS Opinion on Fragrance Allergens (SCCS/1459/11) reviews the contact-allergy evidence for the substances it can contain.
rich occlusiveDimethicone
- Dimethicone: A silicone that forms a film on the surface of the skin without an oily feel. FDA OTC skin protectant monograph, 21 CFR 347.10(g), lists dimethicone as a skin protectant at 1 to 30%.
humectantGlycerin, Hyaluronic Acid
- Glycerin: A humectant, and one of the two ingredients a comparison of moisturiser components found made a significant difference to skin hydration. FDA OTC skin protectant monograph, 21 CFR 347.10(h), lists glycerin as a skin protectant at 20 to 45%. On the humectant half: Jeong CB, Han JY, Cho JC, Suh KD, Nam GW, "Analysis of electrical property changes of skin by oil-in-water emulsion components", Int J Cosmet Sci 2013;35(4):402-410, DOI 10.1111/ics.12059, PMID 23621673, found that "glycerine and urea showed significant skin hydration effects compared with other humectants".
- Hyaluronic Acid: A humectant that holds a large amount of water at the skin surface. Chylińska N, Maciejczyk M, "Hyaluronic Acid and Skin: Its Role in Aging and Wound-Healing Processes", Gels 2025;11(4):281, DOI 10.3390/gels11040281, PMID 40277717, open access: hyaluronic acid's "high osmotic activity and anionic structure enable it to bind large amounts of water", and "sodium and potassium hyaluronate are widely used in moisturizing products". The same review notes that high-molecular-weight hyaluronic acid does not penetrate the deeper layers.