Ingredient guide
Glycerin
INCI name · glycerin
In short
Glycerin is a humectant used for hydration. In human studies, complete creams containing 20% glycerin increased measured skin hydration, but the whole formula and the endpoint being measured still matter.
Works forFrom reviewed ingredient data
Hydration · Barrier
Skin type
Dry · Sensitive · Combination · Oily
Best used
Anytime
What it is
In human studies, 20% glycerin creams increased measured skin hydration. One short vehicle-controlled study did not improve TEWL or surfactant response; the whole formula still matters.
Evidence receipt
StrongGlycerin · applied to skin
Based on 3 sources
Open the citable recordHuman studies of complete creams found that 20% glycerin increased measured skin hydration; effects on other endpoints depended on the formulation.
Studied as Glycerin: 20% glycerin cream, vehicle cream, cream base without glycerin, 4% urea plus 4% sodium chloride cream, glycerol plus petrolatum emollient, vehicle, vehicle plus glycerol, vehicle plus petrolatum.
These studies tested complete creams, not glycerin in isolation. One short vehicle-controlled study found no added improvement in transepidermal water loss or surfactant response, and a separate comparator trial found equal improvement in dryness rather than superiority.
See 3 sources
Bilateral randomized double-blind study in 17 healthy volunteers over 10 days: the 20% glycerin cream increased measured skin hydration versus vehicle, but did not improve transepidermal water loss or the response to sodium lauryl sulphate.
skin hydration, transepidermal water loss, sodium lauryl sulphate irritation response · 20% glycerin cream, vehicle cream
Int J Cosmet Sci, 2001Randomized double-blind study in 197 people with atopic dermatitis over 30 days: dryness improved equally with the glycerin and urea/saline creams; moderate or severe smarting was reported by 10% with glycerin versus 24% with urea/saline.
dryness, smarting · 20% glycerin cream, cream base without glycerin, 4% urea plus 4% sodium chloride cream
Acta Derm Venereol, 2002Randomized double-blind four-arm crossover study in 51 people measured over 12 hours: the complete emollient outperformed vehicle; the glycerol component contributed to hydration while petrolatum contributed to the transepidermal-water-loss effect.
transepidermal water loss, corneometry · glycerol plus petrolatum emollient, vehicle, vehicle plus glycerol, vehicle plus petrolatum
J Cosmet Dermatol, 2020
Affiliation note. Publication links report the study authors and their affiliations. MIRU does not infer independence from an affiliation alone.
When to use it
Either. As often as your routine runs.
On the label
Rarely shown as a % on labels
Look for it high on the ingredient list instead. That is where it does its work.
Pairs well with
Where it sits
A watery layer. After cleansing, before anything heavier, ideally on slightly damp skin.
- Cleanse
- Tone
- Glycerin
- Moisturise
- SPF
Also found as
Related
Compare products
Browse product comparisonsWhere to find it
Examples, not a ranking. A product lookup can confirm identity and background; a verdict still needs the full ingredient list.
La Roche-Posay Physiologique Micellar Water Ultra for Sensitive Skin
Glycerin cleanser built for daily use rather than a squeaky-clean finish.
Vanicream Gentle Facial Cleanser
A glycerin wash for the step most routines rush. Tightness after is the signal to stop.
Glycerin moisturiser as the finishing layer, morning and night.
Product discovery is not efficacy proof. These examples are not ranked by commission.
Common questions
What does glycerin do for skin?
In one short vehicle-controlled human study, a 20% glycerin cream increased measured skin hydration. It did not improve TEWL or the response to a surfactant in that study.
Does every glycerin moisturiser work the same way?
No. The reviewed studies tested complete creams, so the whole formula, glycerin concentration, comparator and measured endpoint all shape the result.
How strong is the evidence for glycerin?
The evidence for hydration is strong but bounded. The human studies support measured hydration with 20% glycerin creams, not a claim that glycerin is superior to every other humectant or that every formula performs the same way.
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Personal guidance, not medical advice.