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Moumoujus

EGG SHELL POWDER.

Valuable / ABRASIVE

Derived from natural eggshells and primarily composed of calcium carbonate, this finely processed powder offers multifaceted benefits for skincare. It functions as a mild physical exfoliant, effectively absorbing excess sebum, and contributing to the refined appearance of pores for a smoother, mattified complexion.

Summary

Abrasive/Exfoliant Absorbent/Mattifier Bulking Agent Opacifying Agent Viscosity Controlling

Science

Mechanism of Action

Egg shell powder, consisting predominantly of calcium carbonate (CaCO₃), acts mechanically to improve skin texture. When finely ground, its particulate nature provides gentle physical exfoliation, aiding in the removal of dead skin cells and preventing pore congestion. Its high oil-absorption capacity helps to manage sebum production, reduce skin sheen, and minimize the visual prominence of large pores by clearing trapped dirt and oil. Additionally, it serves as a bulking agent, opacifier, and texture enhancer, improving formulation feel. The presence of trace minerals like magnesium, phosphorus, and zinc may support skin balance, while heated variations have demonstrated antimicrobial properties.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 A 2020 study by Jung et al. in South Korea observed significant improvements in skin texture and a reduction in large pore size with the application of finely crushed egg shells. However, further human clinical trials are recommended to fully establish effectiveness and safety for daily cosmetic use, as much research remains in laboratory or animal experiment phases.
  2. 02 Research into eggshell powder as an alternative facial powder indicated its efficacy in absorbing oil and enhancing complexion, providing an 'even tone and instant glow' on various skin tones when prepared as a fine, translucent powder. This suggests its potential as a sustainable and accessible cosmetic ingredient for mattifying and evening skin.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH 7 – 10.5
0 7 14

Stability

Calcium carbonate maintains chemical stability in neutral to alkaline environments, typically exhibiting a pH range of 9.0-10.5. It will react adversely with acidic phases, which can compromise formulation integrity.

Conflicts

  • Acidic phases/Strong acids (reacts, may engage in violent explosive reactions)
  • Strong oxidizers

Safety

Safety Profile

CIR Status
Safe as used
Max tested
25%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed calcium carbonate, the primary constituent of egg shell powder, safe for cosmetic use within current practices and concentrations, provided formulations are non-irritating. The FDA lists calcium carbonate as Generally Recognized As Safe (GRAS) for direct food substances. Proper processing to achieve finely ground particles is critical to prevent potential skin irritation from abrasive coarse particles.

Your Skin

Skin Compatibility

Yes Normal
No Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

Egg Shell Powder is a valuable multi-functional ingredient for skincare, offering mild exfoliation, significant oil absorption, and pore-refining benefits, with a favorable safety profile for various skin types despite ongoing needs for more extensive human clinical trials specific to cosmetic use concentrations.

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