Aromatherapy Associates Inner Strength Soothing Cleansing Balm

Its job in a formula is boring, but useful:

Typical concentrations range from 0.1-50% and it's usually low single digits in leave-on skincare.

One thing that sets it apart from other fatty alcohols is that it's used deliberately as a penetration enhancer in topical drug delivery. This is because it "loosens" the packing of your skin's surface lipids a bit so other ingredients can get through more easily.

A study on human skin found both Oleic Acid and Oleyl Alcohol at 0.75% increased how much topical anti-inflammatory drug got through with the effect leveling off after about 12 hours.

Allergic reactions are uncommon but documented; there's a published case of a patient with atopic dermatitis who developed severe allergic contact dermatitis from a prescription cream. A patch testing traced it specifically to the Oleyl Alcohol in the formula rather than the active drug.

The Cosmetic Ingredient Review Expert Panel concluded Oleyl Alcohol is safe as used in cosmetics. Acute toxicity testing showed very low toxicity, animal tests showed minimal to mild skin irritation, human patch testing found low irritation and sensitization potential, and no phototoxicity or photosensitization has been reported.

It's reasonable to patch test if you have eczema, a known fatty alcohol allergy, or you've reacted to Stearyl or Cetyl Alcohol before.

Oleyl Alcohol scored a 4 out of 5 for comedogenicity in the 1989 rabbit ear study. Just know the rabbit ear test has real limits:

It's worth watching if you're acne-prone and how you will react to it really comes down to concentration, formula, and your skin.

The culprit behind fungal acne, the Malassezia yeast, feeds on fatty acids with carbon chain lengths between C11-C24. Oleic Acid, at C18, falls right into that sweet spot.

In vitro studies have shown that Oleic Acid is one of the fatty acids that induce rapid Malassezia growth in lab settings. Since this ingredient is created from Oleic Acid, it may not be fungal acne safe.

This ingredient is typically used in concentrations between 1-10%. Studies have found it to be non-sensitizing, non-phototoxic, and non-photoallergenic.

A close cousin of this ingredient is Glyceryl Stearate SE ("self-emulsifying"). This just has a small amount of sodium or potassium stearate added so it can emulsify without a co-emulsifier.

Since this ingredient is an ester of a C18 fatty acid, it may not be fungal acne safe. The Malassezia yeast can potentially metabolize within the C11-C24 range.

Fun fact: The human body also creates Glyceryl Stearate naturally.

Like other plant oils, this can help nourish the skin. The germ of rice is rich in oils, vitamins, minerals, antioxidants, and protein.

This ingredient may not be fungal-acne safe.

Learn more about the benefits of rice extract.

This ingredient may not be fungal acne safe because behenic acid falls into the chain-length range that Malassezia yeasts can feed on.

Linoleic acid is the most abundant fatty acid naturally found in your epidermis and your skin uses it to build ceramides.

Baobab seed oil also brings some Vitamin E that provides mild antioxidant activity and helps keep the oil itself stable.

An actual human study that ran a 48-hour occlusive patch test found this ingredient caused no significant irritation.

Because this ingredient is full of C16-18 fatty acids that Malassezia feeds on, this ingredient may not be fungal acne safe.

In pressed powder cosmetics, it double as a compacting agent.

This ingredient can be synthetically created or plant-derived. Safety-wise, it has a solid track record.

One thing to flag for fungal acne: since this ingredient is the monoester of behenic acid (C22), it falls within the C11-24 range that Malassezia can metabolize.

The ranges of the fatty acids differ so much because it varies batch to batch depending on the cultivar and the growing conditions.

In skincare, it mostly does good plant oil stuff: it softens, sits on the surface to slow water evaporation, and makes formulas feel richer.

Now the honest part. Corn oil isn't studied much in dermatology but we do know it's the go-to vehicle in lab research. So there's decades of research where corn oil was the boring control; it never produced an effect of its own but we also don't have much research on it doing something exciting for your skin.

The one thing worth talking about is linoleic. Acne-prone follicles tend to be low in linoleate and a small study found topical linoleic acid shrank microcomedones by around 25% over a month. That was pure linoleic acid and not corn oil so it should be filed under "promising theory" rather than "proven benefit".

Concentration use can be anywhere from trace amounts to about 14% (the high end shows up in cleansers, moisturizers, body creams, and masks). Corn germ oil, which is basically the same ingredient under a different INCI name, has been reported as high as 25% but most of the time you're looking at low single digits.

Corn oil itself isn't a common allergen. Allergies to actual corn are triggered by corn proteins which is mostly refined out of the oil for cosmetic use. How much of the protein removed depends on the manufacturing process, so it's always better to patch test just in case.

This ingredient does have a comedogenic rating of 0-3, but this doesn't mean a formula with this ingredient will clog pores.

Human testing has proved that any finished product with this ingredient won't automatically make you break out; it really comes down to concentration, formula, and your skin.

The Malassezia yeast can't make its own fatty acids and breaks down oils around it to feed. Lab research shows the yeast grows when fatty acids in the C11-C24 range are available. Since corn oil is almost entirely C16-C18 fatty acids, this ingredient may not be fungal acne safe.

Strawberries have antioxidant and hydrating properties. They contain many compounds that are potent antioxidants, such as anthocyanins and Vitamin C.

As a preservative, it works by disrupting the membrane of microbial proteins. This helps keep bacteria and fungi from growing in your products.

The sensitization picture is actually quite assuring as well:of nearly 71,000 patients patch tested with benzyl alcohol, only 0.21% showed a positive reaction with most of them being weakly positive.

This led researchers to conclude that benzyl alcohol cannot be regarded as a significant contact allergen.

It is worth noting this ingredient is classified as one of the EU's regulated fragrance allergens and restricted to 1% in finished products.

Labels must also declare it in concentrations above 0.001% in leave-on products and 0.01% in rinse-off products.

At concentrations around 5%, localized redness and itching can appear as a direct irritant response and not as a true allergic reaction.

The gamma-linoleic acid (GLA) is the headliner here; it's relatively rare in plant oils and acts as a precursor for anti-inflammatory signaling molecules in the skin.

There's a mixed body of clinical research with this ingredient as well, mostly on eczema/atopic dermatitis skin.

Some controlled trials showed improvement in inflammation, dryness, scaling, and overall severity. Other studies and large meta-analysis failed to show a significant effect; the honest takeaway here is "promising but inconsistent" rather than "miracle oil".

On the safety front, this ingredient is found to be safe as used in cosmetics and even has a history of safe food use.

This ingredient does have a comedogenic rating of 3, but this doesn't mean a formula with this ingredient will clog pores. Human testing has proved that any finished product with this ingredient won't automatically make you break out; it really comes down to concentration, formula, and your skin.

Since this oil is contains oleic acid and palmitic acid, it may not be fungal acne safe. The Malassezia yeast feeds on fatty acids with carbon chain lengths between C11-C24. Oleic Acid sits at C18 and Palmitic acid sits at C16.

In vitro studies have shown that oleic acid and palmitic acid are some of the fatty acids that induce rapid Malassezia growth in lab settings.

Topically applied tocopherol has been shown to protect against UV damage by ramping up the skin's own natural defense enzymes.

It also acts as a skin conditioning agent; some studies show that regular topical use can improve the skin's water-binding capacity over 2-4 weeks.

This ingredient is especially loved for being a team player. When combined with Vitamin C, the photoprotective effect of both ingredients roughly doubles and the combo also helps reduce UV-induced DNA damage.

This ingredient has some brightening potential but it's more of a prevention ingredient than spot-fader. Cell studies show it can slow down melanin production but it's worth noting that it's not the most powerful brightener out there.

In formulations, it also serves as a stabilizer that helps protect other oxidation-prone ingredients from degrading.

Concentrations usually range from 0.1-1% in most leave-on products.

It is effective at low concentrations (<0.6%). Clinical studies have found it to be non-irritating, non-sensitizing, and non-photosensitizing.

Like all essential oils, this ingredient is a known sensitizer at higher concentrations. This is because this oil also contains known skin-irritating fragrances, limonene and camphor. Limonene and camphor are both known EU allergens.

While patchouli oil holds FDA GRAS ("generally recognized as safe") status, it is typically used at low levels and subject to usage guidelines.

Those with sensitive skin should patch test before using.

Chamomile is rich in antioxidants and has anti-inflammatory properties. Several compounds found in chamomile help with soothing, such as bisbolol.

You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Remember to stay hydrated!

You'll typically see this ingredient used in very small amounts; anything above 0.001% in a leave-on product or 0.01% in a rinse-off has to be named on the label in the EU. The citrus oils that carry it sit around 0.5-1% in a finished formula.

Fresh limonene is a weak allergen; the real issue is that it slowly reacts with air and then breaks down from oxidation to create hydroperoxides (which are strong sensitizers). This is why suppliers are required to keep the peroxide value below 20 mmol.

Positive reactions in people being investigated for eczema vary:

It's worth skipping if you have a known fragrance allergy or a compromised barrier, but the risk is low for most people.

Older or long-opened products are also more likely to bother you than fresh ones due to oxidation.