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Moumoujus

P-CRESOL.

Avoid CAS 106-44-5 / ANTIMICROBIAL, PERFUMING

P-Cresol is an organic compound primarily utilized in cosmetics as a fragrance ingredient, offering a strong floral scent, and as a biocide or preservative. However, its application is significantly limited by considerable safety concerns, including potential for skin depigmentation and high allergenic risk, with insufficient data to establish safe usage concentrations.

Summary

Fragrance Preservative Antimicrobial

Science

Mechanism of Action

On the skin, p-Cresol exerts toxicological effects by initiating oxidative stress through the activation of NADPH oxidase and elevating cAMP response element-binding protein (CREB) levels as an adaptive cellular response. It can dysregulate brain-derived neurotrophic factor (BDNF) secretion and disrupt normal neurotransmission. Furthermore, p-Cresol may compromise the integrity of the vascular system by disrupting endothelial redox balance, increasing endothelial permeability via the Rho/Rho kinase pathway, and altering adherens junctions through actin cytoskeleton modifications and relocation of vascular endothelial (VE)-cadherin.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

P-Cresol is not an ingredient commonly 'dusted' or overhyped for skincare benefits due to its recognized safety concerns and lack of established positive effects.

The Formula

Formulation

Solubility
Both
Optimal pH N/A
0 7 14

Stability

Optimal pH for stability in cosmetic formulations is not explicitly defined. However, biodegradation studies indicate a faster degradation rate around pH 6, with inhibition at very low or high pH levels.

Conflicts

  • May increase the penetration of other cosmetic ingredients, which formulators must consider for overall product safety and efficacy.

Safety

Safety Profile

CIR Status
Insufficient data
Sensitization risk High

The Cosmetic Ingredient Review (CIR) Expert Panel found insufficient data to support the safety of p-Cresol for cosmetic use, specifically regarding skin sensitization or skin lightening. There is concern it may be a strong allergen and has been linked to depigmentation of hair and potentially the skin. A concentration limit of 0.5% suggested for other cresol isomers (m-Cresol and o-Cresol) to prevent chemical leukoderma does not apply to p-Cresol due to the lack of sufficient safety data. The FDA no longer permits p-Cresol as a synthetic flavoring substance.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Avoid

Given the insufficient safety data, high potential for allergenicity, risk of depigmentation, and mechanisms implying skin barrier disruption and oxidative stress, p-Cresol should be avoided in precision skincare formulations.

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