• Powerful humectant that attracts moisture to the skin
• Improves spreadability and texture of formulations
• Excellent solvent for active ingredients and essential oils
• Enhances penetration of actives in skincare
• Compatible with water and alcohol-based products

Propylene Glycol (PG) – Multi-Functional Humectant & Solvent for DIY Cosmetics

 Propylene Glycol (PG) is a widely used cosmetic ingredient known for its excellent moisture-retention properties. It works by drawing water into the skin and enhancing the absorption of active ingredients. In formulations, PG also acts as a solvent and stabilizer, making it ideal for dissolving ingredients like salicylic acid, essential oils, and plant extracts. Its non-greasy texture and high compatibility make it a go-to for serums, lotions, shampoos, and even perfumes.

NCI Name: Propylene Glycol

CAS Number: 57-55-6

Solubility: Water-soluble, alcohol-soluble

Add Phase: Aqueous phase

pH Stability: Stable across a wide pH range (3–10)

Processing Temperature: Up to 80°C

Appearance: Clear, colorless, odorless liquid

Odor: None to faint

Molecular Formula: C₃H₈O₂

Molecular Weight: 76.09 g/mol

Flash Point: ~103°C

Density: ~1.036 g/cm³

Chemical Type: Diol (glycol)

Functional Groups: Hydroxyl

Primary Cosmetic Uses: Humectant, solvent, carrier fluid, penetration enhancer

• Usage Rate: 1–10% in most formulations
• Recommended Combinations: Glycerin, Hyaluronic Acid, Actives
• Storage: Store tightly sealed in a cool, dry area

Use Propylene Glycol to dissolve water-insoluble actives like salicylic acid or certain botanical extracts before adding them to serums, toners, or lotions for better absorption and efficacy.

✔️ Oily

✔️ Dry

✔️ Combination

✔️ Sensitive (in low concentrations)

1. Clarifying Toner

5% Propylene Glycol

3% Niacinamide

2% Salicylic Acid

0.5% Preservative

89.5% Distilled Water

2. Lightweight Hydrating Serum

10% Propylene Glycol

2% Panthenol

1% Hyaluronic Acid

0.5% Preservative

86.5% Water

3. Shine-Boost Hair Serum

5% Propylene Glycol

2% PEG-40 Hydrogenated Castor Oil

2% Fragrance

0.5% Preservative

Balance with water or botanical hydrosols

Serums
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Creams & Lotions
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Toners
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Face Masks
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Cleansers
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Hair Masks
⭐⭐⭐☆☆ – Average
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Deodorants
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Eye Creams
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Shampoos
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Soaps
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Conditioners
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Lip Balms
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Body Butters
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Ointments
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