Buy Now
Ingredient Glossary · Preservative

Methyl Paraben

Methyl 4-hydroxybenzoate · محافظِ حسن

Methylparaben is the world’s most widely used cosmetic preservative — a short-chain paraben ester that protects water-containing products from bacterial and fungal contamination. Known in Pakistan as Muhafiz-e-Husn (محافظِ حسن), it enables shelf-stable creams, serums, and shampoos at minimal cost.

CAS
99-76-3
Identifier
Max
0.4% EU
Regulatory
Annex V
Entry 12
EU Status
Scroll
Quick Reference

At a Glance

IUPAC
Methyl 4-hydroxybenzoate
CAS / INCI
99-76-3 / METHYLPARABEN
Formula / MW
C₈H₈O₃ / 152.15
Physical Form
White crystalline powder
Melting Point
130–131°C
LogKow
1.96
pH (1% soln)
5.0–6.0
Halal Status
100% Halal ✓
Function
Antimicrobial preservative — bacteriostatic & fungistatic
Key Targets
Gram+ bacteria, yeasts, moulds
EU Status
Annex V Entry 12 ≤0.4% single, ≤0.8% mixture
Optimal pH
4.5–6.5
Urdu Name
محافظِ حسن — Muhafiz-e-Husn
Shelf Life
36–48 months sealed
Introduction

The Backbone of Cosmetic Preservation

Methylparaben is the world’s most established cosmetic preservative, with a century-long safety record that has been reconfirmed by the European Scientific Committee on Consumer Safety (SCCS) in 2023. This short-chain paraben ester is the gold standard for protecting water-containing cosmetics against bacterial and fungal contamination in Pakistan’s humid tropical climate. Unlike synthetic alternatives that cost 3–5 times more, methylparaben delivers broad-spectrum efficacy at minimal concentration (0.15–0.25%) and is fully compatible with brightening actives like niacinamide, vitamin C, alpha-arbutin, and kojic acid.

For Pakistani formulators targeting urban women (18–40), the bridal beauty segment, men’s grooming, and the booming herbal/Halal beauty market, methylparaben represents not just a regulatory requirement but a commercial advantage. SCCS 2023 confirms safe efficacy at ≤0.4% (EU Annex V Entry 12). Halal certification by JAKIM, IFANCA, SANHA, and Pakistan Halal Authority eliminates the "paraben-free" barrier in conservative markets.

Bio Shop™ Pakistan — Sourcing Note

Cosmetic/pharmaceutical grade, ≥99.0% assay, white crystalline powder with CoA and Halal documentation. Available at bioshop.pk.

Chemical Identity

Formulation Profile

IUPAC NameMethyl 4-hydroxybenzoate
CAS Number99-76-3
EINECS202-785-7
CosIng REF35342
E-NumberE218 (food preservative)
Formula / MWC₈H₈O₃ / 152.15 g/mol
Functional ClassAntimicrobial preservative (bacteriostatic, fungistatic)
Paraben FamilyShort-chain C1 (methyl ester of p-hydroxybenzoic acid)
LogKow1.96 (lipophilic, membrane-permeable)
Synthesis RouteFischer esterification: HO–C₆H₄–COOH + CH₃OH → HO–C₆H₄–COOCH₃ + H₂O
Natural OccurrenceTrace in cloudberry, white wine, bourbon vanilla (commercially irrelevant)
Urdu Nameمحافظِ حسن · Muhafiz-e-Husn (Beauty Preservative)
Quality Assessment

Grade Profiles

Premium
Cosmetic Grade
Bio Shop™ Pakistan · ≥99.0%
Assay Range
99%
White powder, standard formulation grade
Standard cosmetic/pharmaceutical grade used in 95% of commercial formulations. Bio Shop™ stocks this. Ideal for creams, serums, shampoos, body lotions. CoA available.
Pharma
Pharmaceutical Grade
BP / USP / EP · Equivalent specs
Assay Range
98–101%
BP/USP/EP compliant, narrower tolerance
Pharmaceutical-grade methylparaben meets BP, USP, and European Pharmacopoeia standards. Tighter assay range, detailed impurity limits. Used in topical medications and premium skincare. Cost premium ~10–15%.
Sodium Salt
Sodium Methylparaben
Soluble form · pH 7.5–8.5
Solubility
400x
Dramatically higher water solubility
Sodium salt of methylparaben. 400 times more water-soluble than free acid. pH 7.5–8.5. Different efficacy profile — use only in special formulations (e.g., clear serums, transparent gels). Not interchangeable 1:1 with methylparaben.
Warning
Adulterated / Sub-standard
Diluted with starch, CaCO₃
Actual Assay
65–80%
Dangerously sub-potent
Diluted with starch or CaCO₃; melting point drops below 128°C; pH of 1% solution shifts outside 5.0–6.0. Compromises product shelf life and safety. Never acceptable. Demand CoA with assay ≥99.0%.
Concentration Behaviour

Use Levels

0.05–0.1%
Partial Protection
Insufficient as sole preservative; protects against yeast & mould only; no gram-positive bacteria coverage. Not recommended.
0.1–0.15%
Low-Risk
Acceptable for stable pH products (anhydrous, low-water systems). Combine with potassium sorbate 0.1–0.2% for safety.
0.15–0.25%
STANDARD
Full broad-spectrum at pH 4.5–7.0. Recommended for creams, lotions, serums, shampoos. Optimal efficacy & cost.
0.25–0.3%
Maximum Efficacy
Full protection in high-water, humid-climate products (e.g., Karachi). No additional benefit above 0.3%.
0.3–0.4%
EU Regulatory Approach
At upper limit of EU Annex V Entry 12. Use only in complex multi-phase, herbal systems.
>0.4%
OVERDOSE
Regulatory violation (EU max 0.4%); no additional preservation benefit; potential irritation in damaged skin. Never exceed 0.4%.
Functional Performance

Preservation Mechanisms

Mechanism 1
Membrane Disruption
LogKow 1.96 partitions into phospholipid bilayers, disrupts permeability and electron transport chains, and destabilizes microbial cell walls. Primary mechanism against gram-positive bacteria and fungi.
Mechanism 2
Metabolic Inhibition
Blocks DNA/RNA synthesis, inhibits enzyme activity, and disrupts nutrient uptake in target microbes. Synergistic with membrane disruption for broad-spectrum efficacy.
Mechanism 3
Synergistic Preservation
Combines with potassium sorbate (0.2%) or sodium benzoate (0.2%) for full gram-negative coverage. Methylparaben handles gram+/yeasts; sorbate/benzoate handles gram–. Ideal partnership.
Mechanism 4
pH-Dependent Activity
Optimal pH 4.5–6.5; un-ionized form is most active. Hydrolyses above pH 8.0. Stable through processing at 70–85°C. Pre-dissolve in warm PG (50–60°C) before adding to water phase.
Bacteriostatic Fungistatic Membrane-Active pH-Dependent Synergistic Gram-Positive Anti-Yeast Anti-Mould Thermostable Cost-Effective
Formulation Accords

Three Pakistani Formulas

Haldi-Neem Ubtan Brightening Cream
ہلدی نیم اُبٹن برائٹننگ کریم — O/W brightening day cream, pH 5.0–5.5, 100g batch
Distilled Water
67.75g
Sweet Almond Oil
8.0g
White Emulsifying Wax
6.0g
Niacinamide
5.0g
Propylene Glycol
3.0g
Glycerin
3.0g
Stearic Acid
2.0g
Cetyl Alcohol
1.0g
Alpha Arbutin
1.0g
Sodium PCA
1.0g
Wild Turmeric Powder
0.5g
Neem Powder
0.5g
Vitamin E Oil
0.5g
Citric Acid
0.35g
Methyl Paraben
0.2g
Potassium Sorbate
0.2g
Method
Pre-dissolve methylparaben in PG at 50°C. Heat water phase (A) to 75°C. Heat oil phase (C) to 75°C. Pour A into C with stirring. Cool to 40°C, add actives. Adjust pH to 5.0–5.5 with citric acid.
Karachi Fresh Brightening Toner-Serum
کراچی فریش برائٹننگ ٹونر سیرم — Water-gel serum, pH 5.0–5.5, 100g batch
Distilled Water
79.1g
Organic Rose Water
5.0g
Niacinamide
5.0g
Propylene Glycol
3.0g
Aloe Vera Extract Liquid
3.0g
Alpha Arbutin
2.0g
Sodium PCA
1.0g
Carbomer 940
0.5g
Sodium Hydroxide (qs)
0.5g
Citric Acid (qs)
0.3g
Hyaluronic Acid Powder
0.2g
Methyl Paraben
0.2g
Potassium Sorbate
0.2g
Method
Disperse carbomer in cold water. Dissolve methylparaben in PG at 50°C. Dissolve HA in cold water. Combine phases. Neutralise with NaOH to pH 5.0–5.5. Add potassium sorbate.
Anti-Dandruff Neem Conditioning Shampoo
اینٹی ڈینڈرف نیم شیمپو — Shampoo, pH 5.0–5.5, 100g batch
Shampoo Base
65.0g
Distilled Water
22.8g
Coco Betaine Liquid
3.0g
Propylene Glycol
2.0g
Neem Oil
2.0g
Glycerin
2.0g
Zinc Pyrithione
1.0g
Sodium Chloride
1.0g
Fragrance
0.5g
Citric Acid
0.3g
Methyl Paraben
0.2g
Sodium Benzoate
0.2g
Method
Dissolve methylparaben in PG at 50°C. Add shampoo base + water + neem. Add coco betaine + glycerin. Add zinc pyrithione. Add preservatives. Adjust viscosity with NaCl. pH to 5.0–5.5 with citric acid.
Pairings & Ingredients

Compatible Partners

Synergist Partners
Potassium Sorbate Sodium Benzoate Ethylhexylglycerin Phenoxyethanol EDTA 2NA
Brightening Actives
Alpha Arbutin Niacinamide Kojic Acid L-Glutathione Vitamin C (SAP/MAP)
Emulsion Components
White Emulsifying Wax Stearic Acid Cetyl Alcohol Sweet Almond Oil Shea Butter
Gel & Serum Bases
Carbomer 940 Hyaluronic Acid Propylene Glycol Aloe Vera Extract Xanthan Gum
Comparative Analysis

Preservative Landscape

Phenoxyethanol
Glycol ether C₈H₁₀O₂
Type
Paraben-free label; good gram-negative
Cost vs Methylparaben
3–5× more expensive
EU Limit
≤1%
Not inherently safer than methylparaben; SCCS 2023 confirms methylparaben superior safety profile.
Potassium Sorbate
Sorbate C₆H₇KO₂
Strength
Excellent mould/yeast; pH-dependent <5.5
Use with
Ideal methylparaben partner (0.2% each)
EU Limit
≤0.6%
Not gram-positive coverage alone; requires methylparaben for broad-spectrum.
Sodium Benzoate
Benzoate C₇H₅NaO₂
Cost
Very low; gram-negative focus
pH Range
<5.5 optimal; inactive above pH 6.5
EU Limit
≤0.5%
Good partner with methylparaben; often combined at 0.1–0.2% each.
Germall Plus Liquid
DMDM Hydantoin + Urea blend
Profile
Broad-spectrum; formaldehyde releaser concern
Cost
Higher than methylparaben
Status
Being phased out in EU; restricted in some regions
Methylparaben recommended over Germall Plus for new formulations.
Disclaimer: This guide is for professional cosmetic formulators only. Always consult SCCS assessments, EU Annex V, and local regulations (DRAP Pakistan) before formulation. Methylparaben is safe at regulated concentrations; independent clinical testing confirms absence of mutagenic, carcinogenic, or endocrine disruption at ≤0.4%.
✓

EU Annex V Entry 12

Maximum 0.4% single preservative, 0.8% in mixtures. SCCS 2023 reconfirms safety. Regulatory standard across Europe, reference for DRAP Pakistan.

✓

DRAP Pakistan

No restriction on methylparaben in cosmetics. EU standards serve as reference. Allowed at up to 0.4% in single-use, 0.8% in combination preservative systems.

✓

Human Safety

LD₅₀ >8000mg/kg oral (non-toxic). Non-irritating, non-mutagenic, non-carcinogenic at regulatory levels. Century-long safety record in billions of cosmetic units.

⚠

Skin Sensitisation

Rare (0–4.2% in patch test populations). "Paraben paradox" — sensitisation only on damaged/compromised skin. No risk in intact skin.

⚠

Endocrine Concern

Very weak estrogen receptor (ER) binding (100,000× less than estradiol). SCCS 2023 concludes no endocrine risk at ≤0.4% use levels. Exposure far below concern threshold.

◆

Environmental

Biodegradable; rapidly metabolised in aquatic systems. Low aquatic toxicity (EC₅₀ >100mg/L fish). Safe for environment at regulatory use levels.

Storage & Handling

Best Practices

Temperature
Below 30°C ideal; stable to 45°C
Container
HDPE plastic or amber glass; avoid metal lids in humid areas
Light
Avoid direct sunlight; UV causes slow photodegradation at λmax 258nm
Shelf Life
36–48 months sealed; 12–24 months opened
Dissolving
Pre-dissolve in warm PG (50–60°C) before adding to water phase
Pre-use
Check for clumping (moisture indicator); gently warm to break clumps
Lahore Climate
Stable at 45°C peak; keep sealed; insulated storage in peak summer
Karachi Climate
Hygroscopic — use silica gel desiccant; seal immediately; avoid metal lids; FIFO rotation
Adulteration check: Solubility test (0.25g in 100mL hot water); melting point (130–131°C); pH of 1% solution (5.0–6.0). Demand CoA ≥99.0% from supplier. Bio Shop™ provides full documentation.
Frequently Asked

Questions & Answers

Is Methylparaben Halal? +
100% Halal. Synthesis chain: p-HBA (petrochemical) + methanol → Fischer esterification → no animal inputs, no haram processing. Certified by JAKIM, IFANCA, SANHA, Pakistan Halal Authority.
How do I verify purity in Pakistan? +
Solubility test (0.25g in 100mL hot water), melting point test (130–131°C), pH test (1% solution should be 5.0–6.0). Demand CoA. Bio Shop™ provides CoA with every order.
How do I store methylparaben in Pakistan's climate? +
Karachi: hygroscopic, use silica gel, sealed HDPE. Lahore: stable at 45°C, keep sealed. Both: avoid direct sunlight, metal lids in humid areas.
What is the correct use level? +
0.15–0.25% standard; combine with potassium sorbate 0.2% for broad-spectrum. EU max 0.4%. Never exceed 0.4%.
Is methylparaben safe for Pakistani/South Asian skin? +
Yes. No differential response. SCCS 2023 covers all skin types. Fitz III–V safe. No special handling needed.
Can I combine with niacinamide, vitamin C, and other actives? +
Fully compatible with niacinamide, vitamin C, alpha-arbutin, kojic acid, retinol, AHAs, BHAs. Caution above pH 8.0 (hydrolysis risk).
Which Pakistani consumer segments benefit most? +
Urban women 18–40 (brightening), bridal market, men's grooming, herbal/Halal beauty.
What about the 'paraben-free' trend? +
SCCS 2023 confirms safe at ≤0.4%. Alternatives are not inherently safer, cost 3–5× more. Halal positioning is your commercial advantage.
Related Products

Ingredient Ecosystem

Preservative Partner
Potassium Sorbate
Broad-spectrum mould/yeast coverage with methylparaben
→
Preservative Synergist
Sodium Benzoate
Gram-negative gram preservation partner
→
Alternative Preservative
Phenoxyethanol
Paraben-free option, 3–5× more expensive
→
Preservation Synergist
Ethylhexylglycerin
Booster for preservative systems
→
Methylparaben Solvent
Propylene Glycol
Pre-dissolve methylparaben in PG before use
→
Broad-Spectrum Blend
Germall Plus Liquid
Being phased out; methylparaben recommended
→
Paraben-Free Alternative
Optiphen Plus Liquid
Preservative-free label option
→
Chelating Synergist
EDTA 2NA
Enhance methylparaben efficacy in hard water
→
Technical Documentation

Download Guide

Access the complete Methyl Paraben ingredient guide in PDF format for offline reference, printing, or sharing with your formulation team.

View & Download PDF
Featured In Ingredient Glossary Preservatives Cosmetic Chemicals Halal Ingredients
Pakistan's Premium Cosmetic Ingredient Supplier
Home Ingredient Glossary About Contact
© 2024 Bio Shop™ Pakistan. Methyl Paraben Powder — CAS 99-76-3. Halal certified. All rights reserved.