Serum Albumin

What is Serum Albumin?

Serum albumin is a major globular protein found in mammalian blood plasma, typically sourced from bovine serum for cosmetic applications due to its abundance and purity. This single-chain polypeptide, stabilized by 17 disulfide bonds, exhibits high water solubility and affinity for water and ions. In skincare and haircare products like moisturizers, conditioners, and sunscreens, it acts by adsorbing onto surfaces to create a sheer, permeable film that minimizes transepidermal water loss and enhances product adherence. As a humectant, its hydrophilic regions bind atmospheric moisture to the skin's stratum corneum, promoting suppleness. In hair products, it coats strands to reduce friction, boost shine, and aid detangling through lubricative and antistatic effects, all while remaining lightweight and non-occlusive.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 2 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Film former

Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.

Hair conditioning

Improves softness, shine, and manageability by reducing friction and static; commonly achieved with cationic agents, silicones, oils, or conditioning polymers.

Skin conditioning agent

Maintains skin softness, smoothness, and flexibility.

Humectant

Attracts and holds water in the stratum corneum, boosting hydration and plumpness; commonly used in moisturizers, cleansers, and hair conditioners.

Benefits

Enhances skin hydration by attracting and retaining moisture on the surface.

Creates a protective film that improves product wear and water resistance.

Softens and smooths skin and hair for better manageability and feel.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit	Who Should Avoid
Individuals with dry or dehydrated skin seeking added moisture.	Those with allergies to bovine or animal proteins.
People with rough or frizzy hair needing conditioning benefits.	Vegans or individuals preferring plant-based alternatives.
Users of sunscreens or makeup wanting improved hold and shine.	People sensitive to protein-based ingredients in cosmetics.

Safety Notes

Considered low hazard with limited concerns for use in cosmetics.
Non-comedogenic, unlikely to clog pores or cause breakouts.

Frequently Asked Questions about Serum Albumin

What is serum albumin in cosmetics?

A protein from bovine blood serum that hydrates, conditions, and forms films in skincare and hair products.

Is serum albumin safe for sensitive skin?

It has a low hazard rating and minimal irritation potential for most users.

Can vegans use products with serum albumin?

No, it is animal-derived, so plant-based options are recommended instead.