Marshmallow Root Extract: Comedogenic Rating & Ingredient Analysis
Marshmallow root extract is one of the gentlest soothing botanicals in skincare, drawn from the roots of Althaea officinalis — the plant that originally lent its name to the confectionery. Its skincare value comes from a thick, slippery substance called mucilage, which coats and comforts the skin. Marshmallow root appears in calming serums, hydrating creams, sensitive-skin cleansers and products designed to offset the irritation of stronger actives. It is a quintessential barrier-friendly ingredient: non-comedogenic, low-irritation and suited even to reactive, compromised skin. Rather than treating a specific concern, its job is to make skin feel comfortable, cushioned and calm.
Quick facts
- Comedogenic rating
- our estimate — not measured
- Irritation risk
- Low
- Effective pH
- —
- Typical strength
- 0.1–3%
- Pregnancy
- Considered safe
- Suits skin types
- sensitivedrynormalcombinationacne-prone
Where this number comes from
No one has published a comedogenic rating for this ingredient. Fulton's 1989 table tested about 250 raw materials and this was not among them, and we found no later study measuring it. The figure shown is our own reasoning from the ingredient's chemistry and how it is used — treat it as an estimate, not a measurement.
Fulton read his own scale as 0-1 not significant, 2-3 borderline, 4-5 positive. The assay is the rabbit ear at 10% dilution, which the paper itself calls extremely sensitive and not fully predictive of human skin. Ratings describe the raw ingredient; concentration and formulation change real-world behaviour.
Caution profile
The four published fields on this page, on one 0–5 scale. Further from the centre means more care is needed — never that the ingredient is worse.
Derived, not measured: pore-clogging is the published comedogenic rating; irritation maps low/moderate/high to 1/3/5; pregnancy maps safe/caution/avoid to 0/3/5; skin-type limits is how many of the seven skin types this entry does NOT list. Every input is printed in words in the quick-facts card above.
Show the numbers
| Metric | 0–5 | Published field |
|---|---|---|
| Pore-clogging | 0 | 0/5 |
| Irritation | 1 | Low |
| Skin-type limits | 1.4 | 5/7 |
| Pregnancy | 0 | Considered safe |
Working pH and typical strength
Where this ingredient is formulated to sit, and at what concentration.
Both bars come from the fields above: the pH window and the typical strength range published for this ingredient. The tinted column is healthy skin's surface pH (about 4.7–5.75).
Show the numbers
| Metric | 0–5 |
|---|---|
| Typical strength | 0.1–3% |
What is it?
Marshmallow root (Althaea officinalis) is exceptionally rich in mucilage, a gel-like polysaccharide that swells in water to form a soothing, film-like layer on the skin. This mucilage gives the extract a humectant, comforting quality, drawing and holding moisture while calming the look of irritation — laboratory studies support anti-inflammatory activity. It also contains flavonoids that add light antioxidant support. Traditionally, marshmallow has been used on chapped, irritated and sensitive skin for its film-forming softness. As a water-based root extract it has a comedogenic rating of 0 and a very low irritation profile, which makes it a natural partner for demanding routines that include exfoliants or retinoids.
Benefits
Soothes and cushions skin
Marshmallow's mucilage forms a comforting, film-like layer that calms the look of irritation, making it ideal for reactive skin and for offsetting harsh actives.
Hydrates like a natural humectant
The gel-like polysaccharides draw and hold moisture at the skin surface for a soft, cushioned feel, pairing beautifully with hyaluronic-acid.
Barrier-friendly comfort
Its gentle, non-stripping character supports a compromised barrier, complementing soothers like panthenol and centella-asiatica in calming routines.
Gentle enough for anyone
With a rating of 0 and a very low irritation profile, marshmallow root suits sensitive, dry and even acne-prone skin and layers under any active.
How to use
Marshmallow root extract is easy and forgiving: use it in a serum, essence, moisturiser or cleanser after cleansing, morning or night. It is especially valuable in a routine that includes exfoliating acids or retinoids, where its soothing, hydrating film helps keep skin comfortable. It layers under sunscreen and over calming actives such as panthenol, centella-asiatica and niacinamide, with no adjustment period and no photosensitivity concern. As with any botanical, patch test if your skin is extremely reactive, though marshmallow is one of the least likely ingredients to cause a problem.
Side effects
Marshmallow root extract is among the most gentle, low-risk cosmetic ingredients, and side effects are rare. Isolated allergy is always theoretically possible with any botanical, so very reactive skin can patch test, but reactions are uncommon. There is no photosensitivity, exfoliation or barrier-stripping risk with marshmallow. Any stinging from a marshmallow-containing product almost always traces to other ingredients such as fragrance, acids or alcohol rather than the root extract.
Who should avoid it
There is almost no one who needs to avoid marshmallow root extract. Only those with a specific, known allergy to the plant should patch test or steer clear. It is considered safe for cosmetic use during pregnancy and breastfeeding, and its gentleness makes it a good choice for sensitive, reactive and barrier-compromised skin. If a marshmallow product irritates you, the cause is almost certainly another ingredient.
Pairs well with
Frequently asked questions
Does marshmallow root extract clog pores?
No. Marshmallow root extract has a comedogenic rating of 0 and does not clog pores, making it one of the safest soothing ingredients for acne-prone and sensitive skin.
What does marshmallow root do for skin?
Its mucilage forms a soothing, hydrating film that calms the look of irritation and holds moisture at the surface, making skin feel cushioned and comfortable, especially reactive or compromised skin.
Is marshmallow root good for sensitive skin?
Yes, exceptionally so. It is one of the gentlest, lowest-irritation botanicals available, ideal for sensitive, dry and barrier-compromised skin, and it pairs well with panthenol and centella-asiatica.
Is marshmallow root related to the candy?
Historically, yes. The confection was originally made using the plant's soothing root sap, though modern marshmallows no longer contain it. In skincare, the root extract is used purely for its soothing mucilage.
Sources & further reading
Medical disclaimer
Find your personal acne triggers
Our free Acne Tracker lets you log breakouts, sleep, stress and diet, and shows you which factors correlate with your flare-ups.