No.9 Bond Protector Nourishing Hair Serum
Hair Treatment
Updated 10 Dec 2025

No.9 Bond Protector Nourishing Hair Serum

Olaplex
29Ingredients
0EU Banned
9Caution
0.2/5Comedogenic
Pregnancy SafeNo flagged ingredients
0.2/5Comedogenic
Pregnancy SafeNo flagged ingredients
Mod. Allergens5 fragrance allergens
69% Natural24% synthetic

Contains Regulated Ingredients

EU Restricted Ingredients

These ingredients are permitted in the EU but subject to concentration limits, usage conditions, or mandatory labelling requirements under Annex III of the EU Cosmetics Regulation.

Cetrimonium ChlorideMax 0.1%
Max concentration:0.1%
Product types:(a) Rinse-off hair products(b) Leave-on hair products(c) Leave-on face products
Conditions:For purposes other than inhibiting the development of microorganisms in the product. The purpose has to be apparent from the presentation of the product.
Sorbic AcidMax 0.6% (acid)
Max concentration:0.6% (acid)
PhenoxyethanolMax 1.0%
Max concentration:1.0%
What does "EU Restricted" mean?

Restricted ingredients are not banned — they are allowed in cosmetic products as long as specific conditions are met:

  • Concentration limits — maximum allowed percentage in the final product
  • Product type restrictions — some ingredients are only allowed in rinse-off or leave-on products
  • pH restrictions — the finished product must stay within a specific pH range
  • Mandatory labelling — certain allergens must be listed on the packaging
  • Usage conditions — must not be combined with certain other ingredients

These limits are based on the EU CosIng database (Annex III) and are updated regularly. Products sold in the EU must comply with all applicable restrictions.

Ingredient Chemistry

pH

pH Efficacy

pH Efficacy

pH 5.0 — Suboptimal
5.0
0Neutral 714
pH estimated from category & ingredients: 5.0
Active ingredients: Glycolic Acid
Glycolic Acid at pH 5: likely ineffective — above 4.5
Glycolic Acid is at pH 5, which is too high for optimal efficacy (3–4).
Detected actives & ideal pH
Glycolic AcidpH 3–4

Microbiome

Composition & Ethics

Product Details

Attributes

Ethics
VeganLikely
No animal-derived ingredients detected
Cruelty-FreeUnknown
No brand statement — contact manufacturer
Safety
Fragrance-FreeContains fragrance
Contains fragrance/parfum
Confirmed Inferred Unknown Not compliant

Composition

69% natural24% synthetic
20 natural 2 unknown 7 synthetic

Based on 29 ingredients analyzed. 69% natural, 7% unknown and 24% synthetic.

Preservatives3 preservatives
FragranceContains added fragrance

Functions Overview (15)

Texture & Feel

Texture & Feel

Expected texture
Concentrated serum or cream — lightweight yet nutrient-dense
SpreadabilityEasy
AbsorptionNormal
Tackiness / ResidueNoticeable
Finish:Clean, manageable hair — not a skin finish

Lather and slip — designed for even distribution through hair strands. Slight initial tackiness that fades into a hydrated dewy finish.