Ingredient review
Polybutylene Glycol-10
INCI: POLYBUTYLENE GLYCOL-10
A gentle, synthetic humectant that helps hydrate skin and improve product feel without common irritation.
In plain English
Polybutylene Glycol-10 is a lab-made ingredient that attracts water to the skin, helping it stay hydrated. It also makes lotions and serums feel smoother and spread more easily. Because it's non-greasy and low-risk for irritation, it's often used in formulas for sensitive or dry skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Polybutylene Glycol-10 is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Polybutylene Glycol-10.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A synthetic polymer (a type of glycol) created in a lab, designed to bind water and condition the skin. It belongs to the same family as propylene glycol but is larger and gentler.
How it works
It draws moisture from the air or deeper layers of the skin to the surface (humectant action), and forms a thin film that helps keep that moisture from evaporating. This dual action supports the skin's natural barrier and leaves it feeling softer.
Pros
Gentle hydration
Attracts water to the skin without the sting or irritation that some other humectants (like propylene glycol) can cause, making it suitable for sensitive skin.
Improves product feel
Helps creams and serums glide on smoothly and absorb quickly, reducing that sticky or heavy sensation.
Cons and cautions
Synthetic origin
Made in a lab rather than from natural sources, which may be a turn-off for those seeking plant-based or 'clean' skincare ingredients.
Potential tackiness
In high concentrations or layered with other humectants, it can leave a slightly sticky or tacky finish on the skin.
Best for
- People with dry or dehydrated skin
- Those with sensitive or reactive skin looking for a gentle humectant
Use caution if
- Individuals who strictly avoid synthetic ingredients
- Those with known allergies to glycols (rare)
Usage tips
Safety summary
Polybutylene Glycol-10 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic rating, making it suitable for most skin types, including sensitive skin. Allergic reactions are very rare.
Research notes
Safety assessments by cosmetic ingredient review panels (e.g., CIR) have found glycols like this to be safe when used as directed. While not as extensively studied as glycerin, its chemical structure suggests low toxicity and good skin tolerance.
Common label clues
- Typical concentration
- Typically 1–5% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng). No specific restrictions at typical use levels.
- Common uses
- Moisturizers, Serums, Cleansers, Toners
- Environmental note
- As a synthetic polymer, it is not biodegradable in the same way as natural humectants. However, it is used in small amounts and is not known to accumulate in the environment.
Good to know
- Polybutylene Glycol-10 is considered a safer alternative to propylene glycol for sensitive skin.
- It's also used in some hair products to add moisture without weighing hair down.
Common questions
What is Polybutylene Glycol-10 in beauty products?
Polybutylene Glycol-10 is a lab-made ingredient that attracts water to the skin, helping it stay hydrated. It also makes lotions and serums feel smoother and spread more easily. Because it's non-greasy and low-risk for irritation, it's often used in formulas for sensitive or dry skin.
What does Polybutylene Glycol-10 do in a beauty product?
It draws moisture from the air or deeper layers of the skin to the surface (humectant action), and forms a thin film that helps keep that moisture from evaporating. This dual action supports the skin's natural barrier and leaves it feeling softer.
Is Polybutylene Glycol-10 safe for most people?
Polybutylene Glycol-10 is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic rating, making it suitable for most skin types, including sensitive skin. Allergic reactions are very rare.
Who should be careful with Polybutylene Glycol-10?
Individuals who strictly avoid synthetic ingredients Those with known allergies to glycols (rare)
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.