Ingredient review
Comfrey Leaf Extract
INCI: Symphytum Officinale Leaf Extract
Comfrey leaf extract is a traditional soothing botanical, but its use in skincare is limited by safety concerns over pyrrolizidine alkaloids (PAs) found in the whole plant.
In plain English
Comfrey leaf extract comes from the leaves of the comfrey plant, a herb long used in folk medicine to help calm skin. In skincare, it's added to products like creams and serums for its potential to soothe irritation and support skin comfort. However, comfrey contains natural compounds called pyrrolizidine alkaloids (PAs), which can be harmful if taken internally or applied to broken skin. For this reason, many brands use only comfrey leaf extract that has been processed to remove PAs, or they avoid it altogether. When used in properly formulated, leave-on products at low concentrations, it's generally considered safe for intact 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
- natural
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Comfrey Leaf Extract 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 Comfrey Leaf Extract.
- 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
Comfrey leaf extract is a water or oil-based extract made from the leaves of Symphytum officinale, a perennial herb native to Europe and Asia. It contains allantoin, rosmarinic acid, and other flavonoids that contribute to its soothing properties.
How it works
Allantoin, a key component in comfrey, is known to help support skin cell turnover and soothe minor irritation. Rosmarinic acid provides antioxidant activity, helping to protect skin from environmental stressors. Together, these compounds may help calm redness and support a healthy-looking skin barrier.
Pros
Traditional soothing reputation
Comfrey has been used for centuries in folk medicine to calm skin, and its allantoin content supports gentle skin renewal.
Antioxidant support
Rosmarinic acid in comfrey leaf extract helps neutralize free radicals, which can contribute to skin aging and dullness.
Cons and cautions
Potential PA content
Pyrrolizidine alkaloids (PAs) in comfrey can be toxic if absorbed through broken skin or ingested. Only PA-free extracts should be used in skincare.
Limited modern research
Most evidence for comfrey's skin benefits comes from traditional use and a few small studies; large-scale clinical trials are lacking.
Best for
- People with occasional redness or sensitivity looking for a gentle soothing ingredient
- Those who prefer traditional botanical ingredients in their skincare routine
Use caution if
- Anyone with open wounds, cuts, or severely compromised skin barrier
- Pregnant or nursing individuals should consult a doctor before using products with comfrey extract
Usage tips
Safety summary
Comfrey leaf extract is generally safe for topical use on intact skin when the extract is certified PA-free. However, due to potential PA contamination, it should not be used on broken skin or by pregnant/nursing individuals without medical advice. Regulatory bodies advise caution, and many brands opt for PA-free versions or alternative soothing ingredients.
Research notes
Research on comfrey leaf extract in cosmetics is limited. A 2013 review in the Journal of Ethnopharmacology noted its traditional use and allantoin content, but highlighted PA toxicity concerns. A small 2010 study found a comfrey cream improved skin barrier function, but more robust human trials are needed. Most evidence remains anecdotal or based on in vitro studies.
Common label clues
- Typical concentration
- 0.1% to 1% in leave-on products
- Regulatory status
- In the EU, comfrey leaf extract is allowed in cosmetics but must comply with restrictions on PA content. The FDA does not specifically regulate comfrey in cosmetics, but advises against internal use due to PA toxicity.
- Common uses
- Soothing creams, Calming serums, After-sun products
- Environmental note
- Comfrey is a hardy perennial that can be grown without heavy pesticides, making it a relatively sustainable botanical source when cultivated responsibly.
Good to know
- Comfrey is also known as 'knitbone' because of its historical use in poultices for bruises and sprains.
- The root contains higher levels of PAs than the leaves, so leaf extract is generally preferred for skincare.
Common questions
What is Comfrey Leaf Extract in beauty products?
Comfrey leaf extract comes from the leaves of the comfrey plant, a herb long used in folk medicine to help calm skin. In skincare, it's added to products like creams and serums for its potential to soothe irritation and support skin comfort. However, comfrey contains natural compounds called pyrrolizidine alkaloids (PAs), which can be harmful if taken internally or applied to broken skin. For this reason, many brands use only comfrey leaf extract that has been processed to remove PAs, or they avoid it altogether. When used in properly formulated, leave-on products at low concentrations, it's generally considered safe for intact skin.
What does Comfrey Leaf Extract do in a beauty product?
Allantoin, a key component in comfrey, is known to help support skin cell turnover and soothe minor irritation. Rosmarinic acid provides antioxidant activity, helping to protect skin from environmental stressors. Together, these compounds may help calm redness and support a healthy-looking skin barrier.
Is Comfrey Leaf Extract safe for most people?
Comfrey leaf extract is generally safe for topical use on intact skin when the extract is certified PA-free. However, due to potential PA contamination, it should not be used on broken skin or by pregnant/nursing individuals without medical advice. Regulatory bodies advise caution, and many brands opt for PA-free versions or alternative soothing ingredients.
Who should be careful with Comfrey Leaf Extract?
Anyone with open wounds, cuts, or severely compromised skin barrier Pregnant or nursing individuals should consult a doctor before using products with comfrey extract
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.