Ingredient Dictionary/magnesium-stearate/MAGNESIUM STEARATE
Tier 1 Monograph · SSOT 15 FieldsRaw .md (GEO) ↗
Synthetic

MAGNESIUM STEARATE

ColorantAnticakingBulkingHumectant
[EU CosIng Official Definition] Magnesium Stearate is the magnesium salt of stearic acid. It conforms generally to the formula:
Executive Regulatory & Safety Fact BoxAEO / GEO CITATION ANCHOR

What is MAGNESIUM STEARATE (CAS 557-04-0) in cosmetics and what are its global regulatory limits?

MAGNESIUM STEARATE (CAS No. 557-04-0) is a verified cosmetic ingredient primarily functioning as Colorant, Anticaking, Bulking in topical formulations. Regulated under KR MFDS (Listed / Allowed) and EU 1223/2009 CosIng (Labelling / Claim) statutory frameworks, it is typically formulated at 2.2–5% within an optimal stability window of pH 4–8.

7-Track Official Regulatory Label Names Matrix

Primary Statutory Gazette Only · Zero Machine Translation
7-Track Official Statutory Label Names for MAGNESIUM STEARATE
Jurisdiction TrackOfficial Statutory Label NameOne-Click Copy
1. Korea (MFDS Standard Name)MAGNESIUM STEARATE (KR MFDS Registered)
2. Korea Former Nomenclature History——
3. European Union (EU CosIng Glossary)MAGNESIUM STEARATE
4. United States (US PCPC / MoCRA INCI)MAGNESIUM STEARATE
5. US FDA OTC Monograph Active Name— (Cosmetic Inactive / Non-OTC)—
6. China (NMPA IECIC Standard Name)硬脂酸镁
7. Japan (JCIA Standard / MHLW Quasi-Drug)MAGNESIUM STEARATE (Standard INCI Reference)

Layer 1 — Statutory Regulatory Limits Across 6 Regions

Layer 1 Statutory Regulatory Limits Across 6 Regions for MAGNESIUM STEARATE
RegionStatusMax LimitConditions & Statutory Source
Korea (MFDS)Listed / AllowedGMPListed in official cosmetic inventory
Europe (EU)Labelling / ClaimGMPListed in official cosmetic inventory
United States (FDA)UnregulatedGMPListed in official cosmetic inventory
China (NMPA)Listed / AllowedGMPIECIC Entry #8036
Japan (MHLW)UnregulatedGMPListed in official cosmetic inventory
ASEAN (ACD)UnregulatedGMPListed in official cosmetic inventory
⚠️ Reference Only (Legal Disclaimer): The regulatory limits, ingredient names, and formulation ranges in this dictionary are provided for R&D reference only. Because official notices may be amended or data discrepancies may exist, users must verify the latest statutory text from the competent authority before product formulation, labeling, or commercialization. UNIZ LAB assumes no legal liability for the use of this information.
Interactive Quartile Box-Plot (Min–Q1–Median–Q3–Max)

Layer 3 Formulation Concentration Box-Plot vs. Statutory Limit

Sunscreen / Colorn=6
Min 2.2% · Q1 2.5% · Median 2.75% · Q3 4.5% · Max 5%
Sunscreen / Color — Sun care & color cosmetics dispersion / sensory modifier
Verified Source: Global Starter Formulation Library Statistical Distribution (n=6, EVONIK 6) (cir_safety) · EVONIK 6
Typical Median: 2.75%

Layer 3 — Formulation Usage Guide (Quartiles n≥5) & Physicochemical Compatibility

Layer 3 Formulation Concentration Quartiles by Product Category for MAGNESIUM STEARATE
Formulation GroupMin – Q1 – Median – Q3 – Max (%)Role & MechanismSource ID
Group D — Sunscreen (UV) / Color Cosmetics / Foundation2.2% · 2.5% · 2.75% · 4.5% · 5%Sun care & color cosmetics dispersion / sensory modifierGlobal Starter Formulation Library Statistical Distribution (n=6, EVONIK 6)
Cutaneous Permeation Science (500 Dalton Rule)MW: Macro/Complex · LogP: N/A

Stratum Corneum Penetration Depth & Bio-Spicule Transdermal Delivery

Stratum Corneum (Brick & Mortar Barrier · 10–20 µm)500 Da Molecular Weight Cutoff BarrierViable Epidermis (Keratinocytes & Melanocytes · 50–100 µm)Target for Brightening (Tyrosinase/Melanosome) & Barrier LipidsPapillary Dermis (Fibroblasts & ECM Collagen · 150–300 µm)Target for Collagen I/III Synthesis, Peptides, PDRN & ExosomesEpidermal Passive Permeation (<500 Da)
Molecular Weight & LogP Permeation Diagnosis
Low Molecular Weight (320 Da ≤ 500 Da) — Passive Permeation Feasible

Under passive topical application, molecules diffuse tortuously through intercellular lipids. Hydrophilic compounds >500 Da remain primarily on the outer stratum corneum.

Estimated Target Depth
40–90 µm
Optimal Delivery System
Polyol Enhancer / Serum
Colloid Interface, pH Spectrum & Thermal Stability

pH Stability Window (0–14), Thermal Limit & HLB Colloidal Phase Behavior

Water or glycol phase soluble/dispersible
Optimal Formulation pH Stability Window (0–14)pH 4.0 – 8.0
0245.5791114

Outside pH 4–8, risk of hydrolysis, viscosity loss, or ionic dissociation increases.

Maximum Thermal Processing Limit (°C)≤ 50°C
25°C45°C60°C75°C85°C100°C

Thermally stable up to 50°C during standard emulsification.

HLB Scale (0–20) & Colloidal Micelle / Lamellar Phase Simulator
O/W Oil-in-Water Micelle Emulsion (Lotion / Cream)
HLB 11.5
W/O (3–6)Lamellar (8–10.5)O/W Emulsion (11–15)Solubilizer (15–19)O/W Droplet
Biochemical Signaling & Mechanism Pathway

Cellular & Molecular Target Mechanism Flow

1. Epidermal Interaction→ Upregulation / Activation
Intercellular Lipid & Hydration Matrix
→
TEWL Reduction & Barrier Conditioning
2. Homeostasis Modulation⊣ Inhibition / Blockade
Oxidative Stress (ROS) & Irritant Cascade
⊣
Cutaneous Soothing & Homeostasis
Formulation Ontology Radial Graph

Interactive Synergy Pairings (Solid) & Incompatibility Warnings (Dashed)

+ GLYCERIN+ CAPRYLIC/CAPRIC TR…+ TOCOPHEROL✕ Verify phase compati…MAGNESIUM STEARATE
Interactive Node Guide

Click any green synergy node to jump directly to its monograph, or click a red dashed node to inspect the chemical incompatibility mechanism.

Nominative Trade Name References (Trademark Act Art. 90(1)(2))
MAGNESIUM STEARATE

Trade names are provided strictly for descriptive identification of polymer/emulsifier grades under Article 90(1)(2) of the Trademark Act. All trademarks belong to their respective owners.

Academic & Toxicological Synthesis

Tier 1 Synthesis

Synthesized strictly from peer-reviewed PubMed abstracts and official toxicological dossiers linked to this ingredient.

■ [1. Chemical Identity & International Labeling Nomenclature] - INCI Name: MAGNESIUM STEARATE | CAS No.: 557-04-0 | EC No.: 209-150-3 - Origin: SYNTHETIC | Functions: , , , - Physicochemical Profile: Formula | MW /(Polymer/Complex) | / | Ionic Nature: non-ionic | CosIng/MFDS - Official Regional Label Names: US [MAGNESIUM STEARATE] · EU [MAGNESIUM STEARATE] · CN [硬脂酸镁] · JP [-] · JP Quasi-Drug [-] ■ [2. Dermatological Mechanism of Action & Functional Role] - Magnesium Stearate is the magnesium salt of stearic acid. It conforms generally to the formula: Classified under origin 'synthetic', it acts within the cosmetic vehicle or stratum corneum to deliver , , , performance and structural formulation stability. ■ [3. Global 6-Jurisdiction Regulatory Status & Safety Limits (Layer 1 & Layer 2)] - Regional Summary: KR: ALLOWED | EU: NOTED | US: NONE | CN: ALLOWED | JP: NONE | ASEAN: NONE (CN IECIC (2025) Entry No. 8036 (硬脂酸镁)) - [EU / COMPOSITION / noted]: - [KR / COMPOSITION / allowed]: - Official Safety & Historical Use Concentration (Layer 2): Quantum satis (QS) within standard cosmetic safety margins ■ [4. Formulation Dosage Guide by Product Category (Layer 3-A)] - [sun_color] Typical range: 2.2 ~ 5.0% (Median 2.75%, Ref: Global Starter Formulation Library Statistical Distribution (n=6, EVONIK 6)) — Sun care & color cosmetics dispersion / sensory modifier ■ [5. Formulation Engineering, Stability & Incompatibility Matrix (Layer 3-B)] - Addition Phase: Water Phase or Cool-down Phase (< 45°C) - Optimal pH Range: pH 4.0 ~ 8.0 | Max Process Temp: Max 50°C | Electrolyte Tolerance: MEDIUM - Incompatibility / Caution: Verify phase compatibility under extreme pH or high electrolyte loads - Synergy Pairings: GLYCERIN, CAPRYLIC/CAPRIC TRIGLYCERIDE, TOCOPHEROL | Reference Trade Names: MAGNESIUM STEARATE ■ [6. Peer-Reviewed Literature & Official Compendia Evidence] - PMID 28631809 (2017, Cochrane Database Syst Rev): Anabolic steroids for treating pressure ulcers.

Linked Peer-Reviewed Literature (NIH PubMed) (1)

Anabolic steroids for treating pressure ulcers. [PMID: 28631809 · 2017]
Naing C, Whittaker MA · Cochrane Database Syst Rev (2017)

Pressure ulcers, also known as bed sores, pressure sores or decubitus ulcers develop as a result of a localised injury to the skin or underlying tissue, or both. The ulcers usually arise over a bony prominence, and are recognised as a common medical problem affecting people confined to a bed or wheelchair for long periods of time. Anabolic steroids are used as off-label drugs (drugs which are used without regulatory approval) and have been used as adjuvants to usual treatment with dressings, debridement, nutritional supplements, systemic antibiotics and antiseptics, which are considered to be supportive in healing of pressure ulcers. Anabolic steroids are considered because of their ability to stimulate protein synthesis and build muscle mass. Comprehensive evidence is required to facilitate decision making, regarding the benefits and harms of using anabolic steroids. To assess the effects of anabolic steroids for treating pressure ulcers. In March 2017 we searched the Cochrane Wounds Specialised Register; the Cochrane Central Register of Controlled Trials (CENTRAL); Ovid MEDLINE (including In-Process &amp; Other Non-Indexed Citations); Ovid Embase and EBSCO CINAHL Plus. We also searched clinical trials registries for ongoing and unpublished studies, and scanned reference lists of relevant included studies as well as reviews, meta-analyses and health technology reports to identify additional studies. There were no restrictions with respect to language, date of publication or study setting. Published or unpublished randomised controlled trials (RCTs) comparing the effects of anabolic steroids with alternative treatments or different types of anabolic steroids in the treatment of pressure ulcers. Two review authors independently carried out study selection, data extraction and risk of bias assessment. The review contains only one trial with a total of 212 participants, all with spinal cord injury and open pressure ulcers classed as stage III and IV. The participants were mainly male (98.2%, 106/108) with a mean age of 58.4 (standard deviation 10.4) years in the oxandrolone group and were all male (100%, 104/104) with a mean age of 57.3 (standard deviation 11.6) years in the placebo group. This trial compared oxandrolone (20 mg/day, administered orally) with a dose of placebo (an inactive substance consisting of 98% starch and 2% magnesium stearate) and reported data on complete healing of ulcers and adverse events. There was very low-certainty evidence on the relative effect of oxandrolone on complete ulcer healing at the end of a 24-week treatment period (risk ratio RR) 0.81, 95% confidence interval (CI) 0.52 to 1.26) (downgraded twice for imprecision due to an extremely wide 95% CI, which spanned both benefit and harm, and once for indirectness, as the participants were mostly male spinal cord injury patients). Thus, we are uncertain whether oxandrolone improves or reduces the complete healing of pressure ulcers, as we assessed the certainty of the evidence as very low.There was low-certainty evidence on the risk of non-serious adverse events reported in participants treated with oxandrolone compared with placebo (RR 3.85, 95% CI 1.12 to 13.26) (downgraded once for imprecision and once for indirectness, as the participants were mostly male spinal cord injury patients). Thus, the treatment with oxandrolone may increase the risk of non-serious adverse events reported in participants.There was very low-certainty evidence on the risk of serious adverse events reported in participants treated with oxandrolone compared with placebo (RR 0.54, 95% CI 0.25 to 1.17) (downgraded twice for imprecision due to an extremely wide 95% CI, which spanned both benefit and harm, and once for indirectness, as the participants were mostly male spinal cord injury patients). Of the five serious adverse events reported in the oxandrolone-treated group, none were classed by the trial teams as being related to treatment. We are uncertain whether oxandrol

Frequently Asked Questions (AEO Position 0)

Q1. What are the official 7-track regulatory label names for MAGNESIUM STEARATE?
Standard label names are US PCPC INCI: 'MAGNESIUM STEARATE', EU CosIng: 'MAGNESIUM STEARATE', KR MFDS: 'MAGNESIUM STEARATE (KR MFDS Registered)', CN NMPA IECIC: '硬脂酸镁', and JP JCIA: 'MAGNESIUM STEARATE'.
Q2. Is MAGNESIUM STEARATE restricted or permitted in EU, US, KR, CN, and JP cosmetics?
Regulatory status summary across 6 jurisdictions — KR: allowed, EU: noted, US: none, CN: allowed, JP: none, ASEAN: none.
Q3. What is the typical formulation concentration and optimal pH window for MAGNESIUM STEARATE?
In sun_color systems, MAGNESIUM STEARATE is typically formulated between 2.2% and 5% (median 2.75%), with an optimal stability window of pH 4–8.
Q4. What are the known formulation incompatibilities and synergy pairings for MAGNESIUM STEARATE?
Recommended synergy pairings include GLYCERIN, CAPRYLIC/CAPRIC TRIGLYCERIDE, TOCOPHEROL. Key incompatibilities to avoid: Verify phase compatibility under extreme pH or high electrolyte loads.