Ingredient review
Propylene Glycol Citrate
INCI: Propylene Glycol Citrate
A gentle, water-attracting ingredient that helps keep skin hydrated and balanced without common irritations.
In plain English
Propylene Glycol Citrate is a hybrid ingredient made by combining propylene glycol (a common moisturizing alcohol) with citric acid (found in citrus fruits). It works like a magnet for water, pulling moisture into the outer layer of your skin and helping it stay there. It also helps adjust the acidity of a product so it feels comfortable on your skin. Unlike some other humectants, it tends to be very gentle and less likely to cause stinging or irritation.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Propylene Glycol Citrate 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 Propylene Glycol Citrate.
- 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
Propylene Glycol Citrate is an ester formed from propylene glycol and citric acid. It appears as a clear, slightly viscous liquid and is used in cosmetics as a humectant (moisture retainer), emollient (skin softener), and pH adjuster. It is considered a milder alternative to plain propylene glycol.
How it works
As a humectant, it draws water from the environment and deeper layers of the skin into the stratum corneum (the outermost skin layer), helping to keep it plump and hydrated. As a pH adjuster, it helps maintain the product's acidity close to the skin's natural pH (around 4.5–5.5), which supports a healthy skin barrier. Its emollient properties also help soften and smooth the skin's surface.
Pros
Gentle hydration
Attracts moisture to the skin without the stinging or irritation sometimes associated with other humectants like lactic acid or plain propylene glycol.
pH-friendly
Helps keep your skincare product at a skin-compatible pH, which supports a healthy barrier and reduces the risk of irritation.
Cons and cautions
Modest hydration power
While effective, it is not as potent a humectant as glycerin or hyaluronic acid, so it may not be enough for very dehydrated skin on its own.
Potential for mild dryness in arid climates
In very dry air, humectants can sometimes pull moisture from the deeper skin layers instead of the air, leading to slight dryness if not layered with an occlusive.
Best for
- People with normal to dry skin looking for gentle hydration
- Those with sensitive or reactive skin who want a mild humectant
Use caution if
- Individuals with a known allergy or sensitivity to propylene glycol or citric acid derivatives
Usage tips
Safety summary
Propylene Glycol Citrate is considered safe for cosmetic use with a very low irritation and allergy risk. It is much milder than plain propylene glycol and is well-tolerated even by sensitive skin types. As with any ingredient, patch testing is recommended if you have known sensitivities.
Research notes
Research on propylene glycol citrate specifically is limited, but studies on propylene glycol and citric acid esters support their safety and efficacy as humectants and pH adjusters. The Cosmetic Ingredient Review has reviewed propylene glycol and its derivatives, concluding they are safe in current usage patterns.
Common label clues
- Typical concentration
- Typically 1–5% in leave-on products, up to 10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. The Cosmetic Ingredient Review (CIR) panel has deemed propylene glycol and its esters safe at typical use concentrations.
- Common uses
- Moisturizers, Serums, Cleansers, Toners
- Environmental note
- Propylene Glycol Citrate is biodegradable and generally considered low-risk for aquatic environments when used in rinse-off products.
Good to know
- Propylene Glycol Citrate is considered a 'modified' ingredient, meaning it is chemically altered to be milder than its starting components.
- It is often used in 'pH-balanced' or 'gentle' formulas because of its dual role as a humectant and pH adjuster.
Common questions
What is Propylene Glycol Citrate in beauty products?
Propylene Glycol Citrate is a hybrid ingredient made by combining propylene glycol (a common moisturizing alcohol) with citric acid (found in citrus fruits). It works like a magnet for water, pulling moisture into the outer layer of your skin and helping it stay there. It also helps adjust the acidity of a product so it feels comfortable on your skin. Unlike some other humectants, it tends to be very gentle and less likely to cause stinging or irritation.
What does Propylene Glycol Citrate do in a beauty product?
As a humectant, it draws water from the environment and deeper layers of the skin into the stratum corneum (the outermost skin layer), helping to keep it plump and hydrated. As a pH adjuster, it helps maintain the product's acidity close to the skin's natural pH (around 4.5–5.5), which supports a healthy skin barrier. Its emollient properties also help soften and smooth the skin's surface.
Is Propylene Glycol Citrate safe for most people?
Propylene Glycol Citrate is considered safe for cosmetic use with a very low irritation and allergy risk. It is much milder than plain propylene glycol and is well-tolerated even by sensitive skin types. As with any ingredient, patch testing is recommended if you have known sensitivities.
Who should be careful with Propylene Glycol Citrate?
Individuals with a known allergy or sensitivity to propylene glycol or citric acid derivatives
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.