Water/Aqua/Eau
Also-called: Aqua;Water | What-it-does: solvent
Good old water, aka H2O. The most common skincare ingredient of all. You can usually find it right in the very first spot of the ingredient list, meaning it’s the biggest thing out of all the stuff that makes up the product.
It’s mainly a solvent for ingredients that do not like to dissolve in oils but rather in water.
Once inside the skin, it hydrates, but not from the outside - putting pure water on the skin (hello long baths!) is drying.
One more thing: the water used in cosmetics is purified and deionized (it means that almost all of the mineral ions inside it is removed). Like this, the products can stay more stable over time.
Sodium Laureth Sulfate
Also-called: SLES | What-it-does: surfactant/cleansing, emulsifying
It’s probably the most common cleansing ingredient of all. It’s usually the Chief Bubble Officer responsible for bigbubbles in cleansing products through the foam it creates is a bit airy and loose and not as dense and luxurious as the foam created by infamous SLS.
As for mildness, it goes somewhere in the middle. It’s often confused with sodium lauryl sulfate (SLS), but they are absolutely not the same. The SLES molecule has a bigger water-soluble head part that makes it milder and much less irritating. It is considered absolutely ok in the amount used in cosmetic products, though if you are looking for a mild facial cleanser, you have better chances with a formula withoutSLES. For an average shower gel? SLES works just fine.
Cocamide MEA
What-it-does: surfactant/cleansing, viscosity controlling, emulsifying, emulsion stabilising
A cleansing agent whose main thing is adding viscosity and foam to cleansing formulas.
Chemically speaking, it is the little sister of Cocamide DEA and has similar properties to that guy. However, being a monoethanolamine instead of diethanolamine has the advantagethat thenitrosamine-concern does not apply for Cocamide MEA.
Glycol Stearate
What-it-does: emollient, emulsifying, surfactant/cleansing | Irritancy: 0 | Comedogenicity: 0
We don't have description for this ingredient yet.
Cetyl Alcohol
What-it-does: emollient, viscosity controlling, emulsion stabilising | Irritancy: 2 | Comedogenicity: 2
A so-calledfatty (the good, non-drying kind of)alcohol that does all kinds of things in a skincare product: it makes your skin feel smooth and nice (emollient), helps to thicken up products and also helps water and oil to blend (emulsifier). Can be derived from coconut or palm kernel oil.
Cocamidopropyl Betaine
What-it-does: surfactant/cleansing
Super common ingredient in all kinds of cleansing products: face and body washes, shampoos and foam baths.
Number one reason for its popularity has to do with bubbles. Everyone loves bubbles. And cocamidopropyl betaine is great at stabilizing them.
The other reason is that it’s mild and works very well combined with other cleansing agents and surfactants. The art of cleansing is usually to balance between properly cleansing but not over-cleansing and cocamidopropyl betaine is helpful in pulling off this balance right.
Oh, and one more nice thing: even though it’s synthetic it’s highly biodegradable.
More info on CAPB on Collins Beaty Pages.
Stearic Acid
What-it-does: emollient, viscosity controlling | Irritancy: 0 | Comedogenicity: 2-3
A common multi-tasker fatty acid. It makes your skin feel nice and smooth (emollient), gives body to cream type products and helps to stabilize water and oilmixes (aka emulsions).
Hydrolyzed Hair Keratin
We don't have description for this ingredient yet.
Hydrolyzed Keratin Pg-Propyl Methylsilanediol
We don't have description for this ingredient yet.
Thioctic Acid - goodie
Also-called: Alpha-Lipoic Acid | What-it-does: antioxidant
Alpha-Lipoic Acid (ALA) is a great antioxidant that's also part of the body's natural antioxidant system. It's soluble both in water-richand lipid-rich environmentsso it's versatile and can interact with many typesof evil oxidants as well as other nice antioxidants.
ALA seems to be a great choice for topical use as studies show it can penetrate the skin rapidly where it's converted to DHLA (dihydrolipoic acid), an even more potent antioxidant molecule. A nicely designed (we mean double-blind, placebo-controlled) 12-week study from 2003 confirmed that 5% ALA cream can decreaseskin roughness and improve general signs ofphotoaging statistically significantly. A slight catch, though, is thatburning and warmth in the skin was quite a common side effect, especially in the first 4 weeks.
All in all, ALA is definitely a research-proven, great antioxidant but if your skin is sensitive higher concentrations might not be for you.
Butyl Methoxydibenzoylmethane - goodie
Also-called: Avobenzone | What-it-does: sunscreen
The famous Avobenzone. It is a special snowflake as it isthe only globally available chemical sunscreen agent that provides proper UVA protection (in the US,new generation sunscreen agents are not approved because of impossible FDA regulations). It is the global gold standard of UVA protection and is the most used UVA sunscreen in the world.
It gives very good protection acrossthe whole UVA range (310-400 nmthat is both UVA1 and UVA2) with a peak protection at 360 nm. The problem with it, though, is that it isnot photostable and degrades in the sunlight.Wikipedia saysthat avobenzone loses 36% of its UV-absorptioncapacity after just one hour of sunlight (yep, this is one of the reasons why sunscreens have to be reapplied after a few hours).
The cosmetic's industry is trying to solve the problem by combining avobenzone with other UV filters that enhance its stability (like octocrylene,Tinosorb S or Ensulizole) or by encapsulating it and while both solutions help, neither is perfect. Interestingly, the combination of avobenzone with mineral sunscreens (that is titanium dioxide and zinc oxide) is not a good idea. In the US, it is flat out prohibited as avobenzone becomes unstable when combined with mineral sunscreens.
As for safety, avobenzone has a pretty good safety profile. It counts as non-irritating, and unlike some other chemical sunscreens, it shows no estrogenic effect. The maximum concentration of avobenzone permitted is 5% in the EU and 3% in the US.
Psidium Guajava Fruit Extract
What-it-does: astringent
We don't have description for this ingredient yet.
Sodium Ascorbyl Phosphate - goodie
Also-called: Form of Vitamin C, SAP | What-it-does: antioxidant, anti-acne
The sodium salt form of skincare superstar, vitamin C. If you do not know what the big fuss about vitamin C is, you are missing outand you have to click here and read all the geeky details about it.
Pure vitamin C (aka ascorbic acid, AA) is great and all, but its lack of stability is a big challenge for the cosmetics industry. Onesolutionis to create stable derivativesthat can be absorbed into the skin, convert there to AA and do all the magic AA is proven to do (which is being an antioxidant, a collagen booster, and a skin brightener).
SAP (the vit C derivative, not the enterprise software, obvs) is a promising derivative that has great stability up to pH 7. The challenge with it thoughisskin penetration. Unfortunately, it seems to be limited, or to quote a great article from theJournal of Cosmetic Dermatology "topically applied ascorbyl phosphate salts are, at very best, poorly absorbed in comparison with AA". Regarding conversion to AA, there seems to be no data about it, so we can neither deny nor confirm it.
We have better news regarding the three magic abilities of vitamin C: there is in-vivo (tested on real people) data showing that SAP does have photo-protective (aka antioxidant) properties, though less than pure AA. SAP might also aidcollagen boosting;in-vitro (made in the lab) data shows that it works, but is less effective than another vitamin C derivative, called MAP (that seems to be as effective as pure AA). As for skin-brightening, there is a trade publication with in-vivo data showing that SAP can fade brown spots.
Another thing SAP might be able to do is to help with acne. A 2005 study showed in vitro (in test tubes) that 1% SAP has a strong antimicrobial activity on evil acne causing P. acnes and it also showed in vivo (on real people) that 5% SAP can strongly improvethe inflammatory and non-inflammatory lesions of acne vulgaris. In fact, the results were comparable or even slightly better than with 5% benzoyl peroxide.
And there is even more regarding SAP and acne. A nice double-blind study from 2009 showed that 5% SAP reduced the inflammatory lesions by 20.14% and 48.82% within 4 and 8 weeks respectively and when combined with 0.2% retinol the results were even better. With this combination treatment, the improvement was 29.28% after 4 weeks and 63.10% after 8 weeks of application.
Aside from research studies, anecdotal evidence also supports SAP being a promising vitamin C derivative. One of the best-selling (vitamin C) serums in Sephora is the Ole Henriksen Truth Serum, while on Amazon it's the OzNaturalsVitamin C 20 Serum. Another popular choice is the Mad Hippie Vitamin C serum, and all of these contain vitamin C in the form of SAP.
Overall, we think SAP is a goody! In terms of anti-aging, it's probably not as effective as pure Ascorbic Acid, but it's totally worth a try. However, if your skin is acne-prone, SAP is yourform of Vitamin C and it's a must-try.
Tocopheryl Acetate
Also-called: Vitamin E Acetate | What-it-does: antioxidant | Irritancy: 0 | Comedogenicity: 0
It’s the most commonly used version of pure vitamin E in cosmetics. You can read all about the pure form here. This one is the so-called esterified version.
According to famous dermatologist, Leslie Baumann while tocopheryl acetate is more stable and has a longer shelf life, it’s also more poorly absorbed by the skin and may not have the same awesome photoprotective effects as pure Vit E.
Oenothera Biennis (Evening Primrose) Oil - goodie
Also-called: Evening Primrose Oil, EPO | What-it-does: soothing, emollient | Irritancy: 2 | Comedogenicity: 3
The oil coming from the seeds of the nice, little, yellow-flowered plant called Evening Primrose. Similar to other plant oils, it's loaded with nourishing and moisturizing fatty acids. It's a very rich source of linoleic acid (66-76%), and also contains thesoothing and healing superstar fatty acid, gamma-linolenic acid (aka GLA, 7-12%) (Btw, the richest known source of GLA is the borage oil, but evening primrose still counts as a very good source of it). It also contains oleic acid, but not too much around 6-15%.
Since the 1980's, EPO is a well-known food supplement and there are quite a lot of studies examining what happens if you take it orally. It seems to be helpful with a bunch of things: atopicdermatitis, dry eyes, brittle nails, sunburn and even acne.
As for the skin, it's a great hydrating plant oil, that can also reduce inflammation and irritation. It's a superb healing agent that can truly help dry skin, not just on the surface by covering it (and not letting waterto evaporate) but by initiating structural changes within the skin. If that's not enough, it also helps skin cell regeneration.
All in all, a real goodie especially for dry, easily irritated skin.
Aleurites Moluccana Seed Oil - goodie
Also-called: Kukui Nut Oil | What-it-does: soothing, emollient
Having such a cool name and coming from Hawaii how could this oil be not good? Well, it is good. It's absorbedexcellently by the skin and is used traditionally by the Hawaiians to soothe sunburn and other inflammations.
Research confirms this: it's shown to have anti-inflammatory, pain reducing, and wound healing properties. It's also a particularlyrich source of moisturizing essential fatty acidslinoleic and linolenic(about 42 and 32%) and it's not so rich in oleic acid - around 15% - that can be good even for acne prone skin.
Glycolipids
We don't have description for this ingredient yet.
Hyaluronic Acid - goodie
What-it-does: skin-identical ingredient, moisturizer/humectant
- It’s naturally in our skin and behaves there like a sponge
- It can bind up to 1000 times its own weight in water
- It is a big molecule from repeated subunits (polymer) so different molecular weight versions exist (unfortunately there is no way to determine MW from INCI list only)
- High-molecular-weight-HA (>500 kDa) is an excellent surface hydrator, skin protectant and can act as an osmotic pump helping water-soluble actives to penetrate deeper into the skin
- Low-molecular-weight-HA (< 500 kDa) can hydrate the skin somewhat deeper though it is still a big molecule and works mainly in the epidermis (outer layer of the skin)
- Low-molecular-weight-HA might also help the skin to repair itself by increasing its self-defense (~ 200kDa used in the study)
- Ultra-low-molecular-weight-HA (<50kDa) is a controversial ingredient and might work as a pro-inflammatory signal molecule
Read all the geeky details about Hyaluronic Acid here >>
Allantoin - goodie
What-it-does: soothing | Irritancy: 0 | Comedogenicity: 0
Super common soothing ingredient. It can be found naturally in the roots & leaves of the comfrey plant, but more often than not what's in the cosmeticproductsis produced synthetically.
It's not only soothing but it' also skin-softening and protecting and can promote wound healing.
Aloe Barbadensis Leaf Juice - goodie
Also-called: Aloe Vera | What-it-does: soothing, moisturizer/humectant
Aloe Vera is one of today’s magic plants. It does have some very nice properties indeed, though famous dermatologist Leslie Baumann warns us in her book that most of the evidence is anecdotal and the plant might be a bit overhyped.
What research does confirm about Aloe is that it’s a great moisturizer and has several anti-inflammatory (among others contains salicylates, polysaccharides, magnesium lactate and C-glucosyl chromone) as well as some antibacterial components. It also helps wound healing and skin regeneration in general. All in all definitely a goodie.
Hydrolyzed Wheat Protein - goodie
What-it-does: moisturizer/humectant
A chemically chopped up version of wheat protein that consists mainly ofamino acids (the building blocks), peptides (a couple of amino acids together), and proteins (lots of amino acids together).
It has moisturizing and film-forming properties and might be able tocounteractthe irritating effects of cleansing agents in cleansers and shampoos. It can also conditionand repairdamaged hair leaving it soft, silky and smooth.
Dimethicone PEG-7 Cocoate
What-it-does: emollient, emulsifying, surfactant/cleansing
We don't have description for this ingredient yet.
Hydroxyethylcellulose
Also-called: HEC | What-it-does: viscosity controlling, emulsion stabilising
A nice little helper ingredient that can thicken up cosmetic products and create beautifulgel formulas. It's derived from cellulose, the major component ofthe cell wall of green plants. It is compatible with most co-ingredients and gives a very good slip to the formulas.
Acrylates/Aminoacrylates/C10-30 Alkyl PEG-20 Itaconate Copolymer
What-it-does: emulsion stabilising
We don't have description for this ingredient yet.
Pentasodium Pentetate
What-it-does: chelating
We don't have description for this ingredient yet.
Benzophenone-4
Also-called: Sulisobenzone | What-it-does: sunscreen
A water-soluble, chemical sunscreen agent that is asecondary UVB absorber with some activity in the short UVA range as well. Being a secondary UV absorber means that its protection is weak and it has to be combined with other sunscreen filters for proper sun protection.
More often than not,Benzophenone-4 is not used as a sunscreen agent but as a photoprotectant to extend productshelf life, or as a color-protectant for products in clear packages.
A Contact Dermatitis article from 2007 names BP-4 as an emerging allergen, as it was the most frequently positive chemical UV filterand thirdmost frequently positive ingredient overall among the 35 substances patch tested in thestudy (13 positives of 1693 people tested).
Glycerin - superstar
Also-called: Glycerol | What-it-does: skin-identical ingredient, moisturizer/humectant | Irritancy: 0 | Comedogenicity: 0
- A natural moisturizer that’s also in our skin
- A super common, safe, effective and cheap molecule used for more than 50 years
- Not only a simple moisturizer but knows much more: keeps the skin lipids between our skin cells in a healthy (liquid crystal) state, protects against irritation, helps to restore barrier
- Effective from as low as 3% with even more benefits for dry skin at higher concentrations up to 20-40%
- High-glycerin moisturizers are awesome for treating severely dry skin
Read all the geeky details about Glycerin here >>
Hydrolyzed Wheat Starch
What-it-does: viscosity controlling
We don't have description for this ingredient yet.
Citric Acid
What-it-does: buffering
Citric acid comes from citrus fruits and is an AHA. If these magic three letters don’t tell you anything, click here and read our detailed description on glycolic acid, the most famous AHA.
So citric acid is an exfoliant, that can - just like other AHAs - gently lift off the dead skin cells of your skin and make it more smooth and fresh.
There is also some research showing that citric acid with regular use (think three monthsand 20% concentration) can help sun-damaged skin, increase skin thickness and some nice hydrating things called glycosaminoglycans in the skin.
But according to a comparative study done in 1995, citric acid has less skin improving magic properties than glycolic or lactic acid. Probably that’s why citric acid is usually not used as an exfoliant but more as a helper ingredient in small amounts to adjust the pH of a formulation.
Sodium Chloride
Also-called: Salt | What-it-does: viscosity controlling
Sodium chloride is the fancy name of salt. Normal, everyday table salt.
If (similar to us) you are in the weird habit of reading the label on your shower gel while taking a shower, you might have noticed that sodium chloride is almost always on the ingredient list. The reason for this is that salt acts as a fantastic thickener in cleansing formulas created with ionic cleansing agents(aka surfactants) such as Sodium Laureth Sulfate. A couple of percents (typically 1-3%) turns a runny surfactant solution into a nice gel texture.
If you are into chemistry (if not, we understand, just skip this paragraph), the reason is that electrolytes (you know, the Na+ and Cl- ions) screen the electrostatic repulsion between the head groups of ionic surfactants and thus support the formation of long shaped micelles (instead of spherical ones) that entangle like spaghetti, and viola, a gel is formed. However, too much of it causes the phenomenon called "salting out", and the surfactant solution goes runny again.
Other than that, salt also works as an emulsion stabilizer inwater-in-oil emulsions, that is when water droplets are dispersed in the outer oil (or silicone) phase. And last but not least, when salt is right at the first spot of the ingredient list (and is not dissolved), the product is usually a body scrub where salt is thephysical exfoliating agent.
Aminomethyl Propanol
What-it-does: buffering
Analkaline (high pH, aka basic) material that is used to set the pH of the cosmetic formula to the right value.
DMDM Hydantoin - icky
What-it-does: preservative
A controversial preservative that hasformaldehyde-releasing properties. It works great against bacteria and also has mildfungicide abilities.
Cosmetic chemist, Colin wrote a great article about formaldehyde and DMDM Hydantoin. He writes that formaldehyde is the perfect example of "the dose makes the poison" principle. It's a natural stuff that can also be found in fresh fruits and vegetables, and eating it in tiny amounts is totally ok. However, in larger amounts (according to Wikipedia30 mL of a solution containing 37% formaldehyde) it's deadly.
The amount offormaldehyde used in cosmetics either neat or throughformaldehyde-releasing preservatives is tiny. Probably that is why the Cosmetic Ingredient Review Broad concluded both in 1988 and in 2008 that DMDM Hydantoin is "safe as used in cosmetics".
However, Colins argues that in the case of formaldehyde-releasing preservatives,formaldehyde is released slowly and the skin has probably not evolved to deal with that. The lingeringformaldehyde might be toxic tothe Langerhans Cells that are important for the skin's defense system. Another potential issue is that formaldehyde-releasers might also release other things while reacting with amino acids in the skin that is probably the explanation why some people are not allergic to formaldehyde but are allergic to formaldehyde-releasing preservatives. These are all theories, far from proven facts, but we feel that there are some justified reasons whyformaldehyde-releasing preservatives andDmdm Hydantoin count as controversial.
All in all, it's up to you to decide if you wanna avoid this preservative groupor not. If so,there are other, less risky and more skin-friendly options out there.
Methylchloroisothiazolinone - icky
What-it-does: preservative
This totally unpronounceable ingredient (let’s take a shortcut: MCI) is a super effective preservative with both antibacterial and antifungal effects that works at very low concentrations.
The bad news with it though is that it can sensitize the skin easily (it’s a so-called non-fragrance allergen). It’s not permitted to be used alone, but only with its BFF, methylisothiazolinone (MI), another icky preservative. Together they have a broad spectrum antimicrobial effect but are permitted to be usedonly in rinse-off products (under 0.0015%).
Methylisothiazolinone - icky
What-it-does: preservative
As you may guess, if something is only recommended in products that you rinse off (cleansers and shampoos), then it’s probably not the best ingredientfor the skin.
Methylisothiazolinone (MI) is a preservative that' super efficient against bacteria at surprisingly low concentrations. The problem with it though is that itcan also sensitize and irritate the skinquite easily when it comes in leave-on formulas.
Currently,some countries are considering to ban it entirely (like Denmark) and the permitted use level is very low(under 0.01%). Luckily there are plenty of products on the market with other preservative options so if you are a better safe than sorry typeit's probably best to avoid it.
Fragrance/Parfum - icky
Also-called: Fragrance, Parfum;Parfum/Fragrance | What-it-does: perfuming
Exactly what it sounds: nice smelling stuff put into cosmetic products so that the end product also smells nice. Fragrance in the US and parfum in the EU is a generic term on the ingredient list that is made up of 30 to 50 chemicals on average (but it can have as much as 200 components!).
If you are someone who likes to know what you put on your face then fragrance is not your best friend - there's no way to know what’s really in it.
Also, if your skin is sensitive, fragrance is again not your best friend. It’s the number one cause of contact allergy to cosmetics. It’s definitely a smart thing to avoid with sensitive skin (and fragrance of any type - natural is just as allergic as synthetic, if not worse!).
