Polyglyceryl-8 Decabehenate/Caprate: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: July 1, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Polyglyceryl-8 Decabehenate/Caprate?

Polyglyceryl-8 Decabehenate/Caprate is a plant-derived ingredient created by linking eight glycerin molecules to long-chain behenic acid and medium-chain capric acid. The result is a multi-arm molecule that behaves like a gentle, skin-friendly oil. First explored in the early 2000s as brands searched for greener replacements for traditional petroleum-based thickeners, it has since found a steady place in modern clean beauty lines.

The manufacturing process starts with vegetable glycerin that is polymerized into polyglycerin-8. This base is then reacted with behenic acid (sourced from oils such as rapeseed) and capric acid (often from coconut oil) to form a decaester, meaning ten fatty acid groups are attached. No solvents remain in the finished material, making it suitable for sensitive-skin formulas.

You will spot Polyglyceryl-8 Decabehenate/Caprate in creamy moisturizers, overnight masks, rich body butters, sunscreens, color cosmetics like foundation and lipstick, as well as soothing baby lotions. Its main job is to fine-tune texture, helping water and oil mix smoothly while giving the product a plush, spreadable feel.

Polyglyceryl-8 Decabehenate/Caprate’s Cosmetic Benefits/Uses

This ingredient is valued for one core function that supports both product performance and sensory appeal.

As a viscosity controlling agent it adjusts thickness so a formula is neither too runny nor too stiff. This helps creams glide on evenly, prevents separation during storage and improves overall stability, allowing actives to stay evenly dispersed and work as intended.

Who Can Use Polyglyceryl-8 Decabehenate/Caprate

Thanks to its mild plant-based nature this emulsifier suits nearly every skin type including dry, oily, combination and sensitive skin. It adds silkiness without leaving a greasy film so even acne-prone users usually tolerate it well. Those with extremely oily complexions may prefer lighter textures but the ingredient itself is not a trigger.

The molecule is made from vegetable glycerin plus fatty acids sourced from rapeseed and coconut so it is suitable for vegans and vegetarians.

No studies indicate risk for pregnant or breastfeeding women when used topically. The molecule is too large to penetrate deeply and is not hormonally active. This is not medical advice so anyone expecting or nursing should show the product to a doctor before adding it to a routine.

Polyglyceryl-8 Decabehenate/Caprate does not increase photosensitivity and can be used day or night alongside sunscreen. It is fragrance free and compatible with common actives like retinoids and vitamin C.

Potential Side Effects/Adverse Reactions

Reactions to topical Polyglyceryl-8 Decabehenate/Caprate vary from person to person. The points below list potential side effects though they are uncommon when the ingredient is used correctly in a finished product.

  • Mild redness or itching in sensitive individuals
  • Rare allergic contact dermatitis for those intolerant to glycerin derivatives
  • Temporary eye stinging if the formula accidentally gets into the eyes
  • Pimples or clogged pores in users extremely prone to breakouts when used in very rich formulas

If any discomfort or adverse reaction occurs discontinue use and consult a healthcare professional.

Comedogenic Rating

Rating: 1 / 5

Polyglyceryl-8 Decabehenate/Caprate earns a low score because its bulky plant-based structure sits on the surface and is easily rinsed away rather than slipping into pores. It provides slip without forming a heavy, occlusive film which keeps the risk of blockages minimal.

Suitable for acne-prone or breakout-prone skin, though formulas that pair it with waxes or rich butters may feel too heavy for very oily complexions.

Summary

Polyglyceryl-8 Decabehenate/Caprate is primarily a viscosity controller that steadies emulsions and gives creams, masks and makeup a smooth glide. It does this by combining an eight-unit glycerin backbone with long and medium chain fatty acids, creating a molecule that thickens while staying light on skin.

The ingredient has carved out a modest niche in clean beauty and baby care lines where formulators want plant-based alternatives to petroleum thickeners. It is generally regarded as safe, non-sensitising and vegan friendly with only rare reports of irritation.

While safety data look solid it is always smart to patch test a new product to make sure your skin agrees with the full formula.

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