Glycerin may not be the trendiest name in skincare, but it is one of the industry's most dependable hydrating ingredients. Also known as glycerol - and sometimes spelt glycerine in the UK - it appears in everything from lightweight serums to rich barrier creams.
So, what exactly is glycerin and how does it benefit the skin?
What is glycerin or glycerol?
Glycerin and glycerol are two names for the same ingredient. It is a clear, colourless and odourless substance belonging to a group of compounds called polyols. It occurs naturally in plant, animal and human tissues, including the skin.
In cosmetics, glycerin is primarily used as a humectant. Humectants attract and bind water, helping to increase moisture in the skin's outermost layer, known as the stratum corneum. Glycerol is also found naturally within this layer, where it contributes to normal hydration and barrier function.
On a cosmetic ingredient list, it will usually appear under its International Nomenclature of Cosmetic Ingredients name, Glycerin. A brand may also refer to it as glycerol when explaining a formula.
What are the benefits of glycerin for skin?
1. It improves hydration
Glycerin's best-known benefit is its ability to help the skin hold onto water. By supporting hydration in the stratum corneum, it can help dehydrated skin feel softer, smoother and more comfortable.
This makes glycerin useful throughout the year. It can help counter the effects of cold British winters, central heating and dry indoor environments, while its versatility also suits lighter summer formulations.
2. It helps support the skin barrier
The skin barrier helps limit water loss while protecting the body from external irritants. When it is compromised, skin may feel tight, dry, rough or sensitive.
By maintaining moisture within the skin's outer layers, glycerin can support normal barrier function. Research also associates glycerol with the mechanisms involved in healthy water distribution and barrier performance.
3. It makes skin feel softer and smoother
Well-hydrated skin is generally more supple. Glycerin can soften the feel of dry, rough skin and temporarily reduce the appearance of fine dehydration lines, creating a smoother-looking complexion.
It is important to distinguish hydration from wrinkle correction: glycerin does not remove established wrinkles, but properly hydrated skin can look plumper and more refreshed.
4. It suits many skin types
Glycerin can be incorporated into products for dry, oily, combination, blemish-prone and sensitive skin. As a humectant, it hydrates without relying on heavy oils, making it especially useful in lightweight gels and oil-free moisturisers.
Its suitability ultimately depends on the complete formulation, however. Someone sensitive to another ingredient in a product may still experience irritation even when glycerin itself is well tolerated.
5. It works well with other skincare ingredients
Glycerin is an effective team player. It is often combined with other humectants such as hyaluronic acid, sodium PCA and sorbitol, alongside emollients and occlusives that soften the skin and help reduce moisture loss.
It can also complement active ingredients such as vitamin C, niacinamide and retinoids by adding hydration to the overall formula. This can help keep routines containing targeted actives feeling more balanced and comfortable.
6. It has a well-established cosmetic safety profile
Glycerin has a long history of use across skincare and personal-care products. A published Cosmetic Ingredient Review safety assessment concluded that it is safe in cosmetics under the assessed conditions of use.
Which REFORM Skincare products contain glycerin or glycerol?
Based on ingredient information published on REFORM Skincare's UK website, the following products contain glycerin or glycerol:
- HYAL • Vitamin C + E Serum combines glycerol with panthenol, antioxidants and other ingredients in a hydrating treatment designed for ageing and menopausal skin.
- Vitamin C 20% Serum includes glycerol to help maintain hydration and softness alongside its targeted brightening ingredients.
- Phyto Botanical Gel pairs glycerol with hyaluronic acid in a hydrating, calming formula for pigmentation and rosacea concerns.
- Intensive Moisturiser uses glycerin with sodium PCA, hydrolysed hyaluronic acid and nourishing ingredients to support dry or dehydrated skin.
- Everyday Moisturiser combines glycerin and hyaluronic acid in a lightweight, oil-free moisturiser with a matte finish.
- Anti-Blemish Crème contains 5% glycerin, providing hydration without adding excess oil while supporting blemish-prone skin.
- Skin Barrier Repair Cream combines glycerin with urea, panthenol and emollient ingredients for very dry, rough, flaky or compromised skin.
REFORM also includes some of these products in skincare kits and routines, so glycerin may be present in a set through one or more of its individual products. As formulas can change, always consult the ingredient list on the product packaging before use, particularly if you have a known allergy or sensitivity.
How should glycerin be used in a skincare routine?
Glycerin is already incorporated into finished skincare formulas at an appropriate level, so there is no need to use it neat. In fact, applying undiluted glycerin can feel sticky and may not provide the balanced performance of a professionally formulated product.
Apply a glycerin-containing serum, gel or moisturiser according to its directions. Serums and gels generally go onto cleansed skin before moisturiser, while moisturisers help complete the hydrating stage of a routine. During the day, finish with broad-spectrum sunscreen.
A reliable ingredient for everyday hydration
Glycerin has earned its place in skincare through consistent, practical performance. It attracts and retains moisture, supports the skin barrier and helps skin feel softer and smoother - without being limited to one particular skin type.
Whether it appears as glycerin, glycerol or glycerine, the purpose is the same: helping the skin maintain the hydration it needs to look and feel healthy.
