Is Cocamidopropyl Hydroxysultaine Safe? A Simple Answer You Can Trust
Written by Irina Webb
If you found Cocamidopropyl Hydroxysultaine on a shampoo label, you can relax a little. It is a mild, coconut-based cleanser with a clean safety record.
I rate it Better (Not In My Top Picks) (What My Ratings Mean).
The ingredient itself does not soak into skin and shows no link to cancer or hormone problems. What holds it back is how it is made, which can leave a trace impurity behind.
What Is Cocamidopropyl Hydroxysultaine?
Cocamidopropyl Hydroxysultaine is a cleansing ingredient made from coconut oil. Chemists call it an amphoteric surfactant, or a sulfobetaine.
That means one molecule carries both a positive and a negative charge. In products, it usually works as a helper ingredient rather than the main cleanser.
What Does Cocamidopropyl Hydroxysultaine Do In Cosmetics?
First, Cocamidopropyl Hydroxysultaine boosts foam and creates a soft, creamy lather. Second, it softens the harshness of stronger detergents, which makes a wash feel gentler on your skin. On top of that, it thickens runny formulas, tames static, and adds light conditioning. These are supporting roles next to its main job of mild cleansing.
You’ll find Cocamidopropyl Hydroxysultaine most often in:
- foaming shampoos
- shower gels and body washes
- face washes and micellar cleansers
- bubble baths and bath soaps
- hand soaps
- baby shampoos
It is a cosmetic and cleaning ingredient only. You will not find it in food.
How Is Cocamidopropyl Hydroxysultaine Made?
Making Cocamidopropyl Hydroxysultaine begins with coconut fatty acids. These react with dimethylaminopropylamine (DMAPA) to build a middle compound called amidoamine. A last step adds a hydroxypropane sulfonate, the manufacturing chemical, which converts that middle compound into the finished sulfobetaine.
The detail worth knowing is this: tiny amounts of DMAPA and amidoamine can stay behind in Cocamidopropyl Hydroxysultaine. Suppliers report keeping free DMAPA low, typically under 2 to 10 parts per million. Those leftover impurities, not Cocamidopropyl Hydroxysultaine itself, are what can trigger most allergic reactions.
Because Cocamidopropyl Hydroxysultaine is a secondary amide, it can also form trace nitrosamides if it is not made with care. Nitrosamides come from the same family as nitrosamines, are also carcinogens, and are more reactive. It takes a partner, though. These traces form only when Cocamidopropyl Hydroxysultaine shares a formula with a nitrosating ingredient, like the preservative bronopol, often slowly over a product’s shelf life. Good formulators avoid that pairing.
Does Cocamidopropyl Hydroxysultaine Penetrate The Skin?
No, it does not. Cocamidopropyl Hydroxysultaine sits on top of the skin instead of soaking in.
The deciding factor is its electric charge. The molecule is permanently charged and water-loving, while the skin’s outer layer is oily and turns water-loving substances away. Charge, not size, is what keeps it out.
Size adds a little too. Scientists use a rough rule: molecules over about 500 daltons are usually too big to slip through skin. Because Cocamidopropyl Hydroxysultaine is a coconut blend, it has no single weight, but its most common molecule is about 423 daltons. That sits under the limit, so size alone would not keep it out. What does keep it out is its permanent charge, which is also why Cocamidopropyl Hydroxysultaine has no usable LogP, the score that rates oily versus watery.
What Is Cocamidopropyl Hydroxysultaine Called On Labels?
On a label, Cocamidopropyl Hydroxysultaine may appear as:
- Cocamidopropyl Hydroxysultaine
- Cocamidohydroxypropyl Sulfobetaine
- 1-Propanaminium, N-(3-Aminopropyl)-2-Hydroxy-N,N-Dimethyl-3-Sulfo-, N-Coco Acyl Derivs., Hydroxides, Inner Salts
Does The U.S. FDA Restrict Cocamidopropyl Hydroxysultaine In Food And Cosmetics?
The U.S. Food and Drug Administration (FDA) does not restrict Cocamidopropyl Hydroxysultaine in cosmetics. That sounds reassuring, but the bar is low.
The FDA bans or limits only a short list of cosmetic ingredients, and it does not review most of them before they reach store shelves. Cocamidopropyl Hydroxysultaine is also not approved for use in food.
Europe takes the opposite approach. It leans on the precautionary principle, which lets regulators set limits when there is reasonable doubt, before harm is proven.
EU Regulations About Cocamidopropyl Hydroxysultaine
The European Union (EU) lists Cocamidopropyl Hydroxysultaine in its CosIng database as a cleansing and foam-boosting surfactant. It sets no concentration limit and no restriction.
I checked the EU restricted-ingredient annexes directly. Cocamidopropyl Hydroxysultaine does not appear in any of them, so Europe allows it without conditions.
Canadian Regulations About Cocamidopropyl Hydroxysultaine
Canada permits Cocamidopropyl Hydroxysultaine in cosmetics. It is not on the Health Canada Cosmetic Ingredient Hotlist, the country’s list of banned or restricted ingredients.
It is also absent from Schedule 1 of the Canadian Environmental Protection Act, the national list of toxic substances.
Can Cocamidopropyl Hydroxysultaine Cause Skin Allergy And Sensitization?
Yes, but it’s uncommon. Cocamidopropyl Hydroxysultaine can trigger an allergic skin reaction, though published reports are rare.
The blame usually falls on the leftover impurities, DMAPA and amidoamine, rather than Cocamidopropyl Hydroxysultaine itself. In standard testing, the ingredient looked clean: it did not sensitize in a human repeated insult patch test at up to 4 percent, nor in a guinea pig maximization study.
Still, real cases exist. A 2000 case report described a person who reacted to Cocamidopropyl Hydroxysultaine in patch testing.
More recently, a 2025 case series found that people who reacted to a Cocamidopropyl Hydroxysultaine cleanser also reacted to dimethylamines and amidoamine. That points to the impurities as the true triggers.
If your skin is sensitive, or a cleanser has bothered you before, choose a product without it.
Is Cocamidopropyl Hydroxysultaine A Hormone (Endocrine) Disruptor?
No. There is no evidence that Cocamidopropyl Hydroxysultaine affects hormones. It does not appear on the European Chemicals Agency endocrine list. No published studies link it to estrogen or other hormone activity. Because it does not enter the body, a hormone effect is very unlikely.
Is Cocamidopropyl Hydroxysultaine Safe To Use While Pregnant?
Cocamidopropyl Hydroxysultaine stays on the skin’s surface and rinses away, so little if any reaches the body. That makes it a low-concern ingredient during pregnancy, especially in wash-off products.
Pregnancy can make skin more reactive, so a gentle, fragrance-light wash is a sensible pick. For your own peace of mind, consult with your medical provider about the products you use.
Are There Any Cancer Concerns Linked To Cocamidopropyl Hydroxysultaine?
No. Cocamidopropyl Hydroxysultaine carries no cancer classification from any major health body. It also tested negative for DNA damage in several lab studies, including the Ames test, a mouse lymphoma assay, and a chromosome study in human cells.
The one indirect concern is nitrosamide formation. If Cocamidopropyl Hydroxysultaine is poorly made, its amide group can react to form trace nitrosamides. These are carcinogens from the nitrosamine family, and they are more reactive. The CIR reports that most tested N-nitroso compounds caused cancer in animals, which is why careful manufacturing matters.
Is Cocamidopropyl Hydroxysultaine Bad For The Environment?
Cocamidopropyl Hydroxysultaine is a coconut-derived surfactant, and surfactants of this type generally break down in standard wastewater treatment. No regulator has flagged it as an environmental hazard.
As with any cleanser, the most eco-friendly move is simply using the amount you need and no more.
Common Claims About Cocamidopropyl Hydroxysultaine: What’s True And What’s Not
Claim: Cocamidopropyl Hydroxysultaine Clogs Pores
Not true. Cocamidopropyl Hydroxysultaine is a rinse-off cleanser that does not stay on skin. It is considered non-comedogenic, meaning it does not block pores.
Claim: Cocamidopropyl Hydroxysultaine Is Just As Allergenic As Cocamidopropyl Betaine
Hard to say for certain. Both share the same impurity story, the leftover DMAPA and amidoamine that drive most reactions. Cocamidopropyl Hydroxysultaine has far fewer reported allergy cases, but it is also used in far fewer products. The lower count may reflect less exposure rather than a gentler ingredient. It has never been named Allergen of the Year, though that title partly reflects how widely Cocamidopropyl Betaine is used.
What I Think About Cocamidopropyl Hydroxysultaine — And What You Should Do
My verdict on Cocamidopropyl Hydroxysultaine is Better (Not In My Top Picks). In other words, I don’t accept it in my best product recommendations. I accept it only in the better products. On the one hand, it cleanses gently, stays on the skin surface, and shows no link to cancer, hormone effects, or reproductive harm.
On the other hand, what keeps Cocamidopropyl Hydroxysultaine out of my top picks is how it is made. The DMAPA route can leave trace DMAPA and amidoamine, the impurities behind most reactions, and the amide group can form trace nitrosamides, carcinogens in the nitrosamine family, if made carelessly. That is a concern I would rather sidestep than manage.
For everyday use, most people do fine with it, particularly in something that washes off fast. If your skin reacts easily, or a past cleanser left it irritated, look for a formula that skips this ingredient.
Frequently Asked Questions
Is Cocamidopropyl Hydroxysultaine Safe For Skin?
For most people, yes. It is a mild surfactant that the majority tolerate well in rinse-off products. A small number of people develop an allergy, usually from its impurities.
Is Cocamidopropyl Hydroxysultaine Natural?
Partly. The starting material is coconut oil, but heavy processing turns it into a lab-made surfactant. Think of it as coconut-sourced rather than natural in the strict sense.
Is Cocamidopropyl Hydroxysultaine The Same As Cocamidopropyl Betaine?
No, but they are close cousins. Both are coconut-based amphoteric surfactants made through the DMAPA route.
Does A Reaction Mean I Am Allergic To Coconut?
No. Any reaction traces back to the leftover impurities, not to coconut. Reacting to this cleanser on your skin is not the same as being allergic to eating coconut.
Is Cocamidopropyl Hydroxysultaine Safe For Babies?
Cocamidopropyl Hydroxysultaine appears in some baby washes, and most babies tolerate it. Still, baby skin is not simply smaller adult skin. It is thinner, its protective barrier is still forming, and it can absorb a little more than grown-up skin.
Babies also have more skin surface for their body weight, so the same wash covers relatively more of them. Because of the impurity question with Cocamidopropyl Hydroxysultaine, the trace DMAPA and the small chance of trace nitrosamides, carcinogens in the nitrosamine family, I would pick a safer wash especially for very sensitive or eczema-prone baby skin.
Why Does EWG Rate It Differently?
The Environmental Working Group (EWG) gives Cocamidopropyl Hydroxysultaine a score of 1, its lowest hazard level. Yet, it still flags high contamination concerns.
We are reading the same evidence and weighing it differently. EWG scores the surfactant as low hazard, while I give more weight to the manufacturing side, the DMAPA impurity and the nitrosamide potential. That is why it sits in my Better tier rather than my Best one.
Sources
EU SCCS / SCCP opinions:
No SCCS or SCCP opinion on Cocamidopropyl Hydroxysultaine (checked; none listed): https://health.ec.europa.eu/scientific-committees/scientific-committee-consumer-safety-sccs_en
Cosmetic Ingredient Review (CIR) safety assessment:
Burnett CL, Bergfeld WF, Belsito DV, et al. (2024). Safety Assessment of Alkyl Sultaines as Used in Cosmetics. International Journal of Toxicology 43(Suppl 1):30S-49S. PMID 38127844: https://cir-reports.cir-safety.org
European Union regulatory databases:
EU CosIng entry for Cocamidopropyl Hydroxysultaine (cleansing, foam-boosting, antistatic, hair/skin conditioning surfactant; no Annex restriction): https://ec.europa.eu/growth/tools-databases/cosing/details/75240
EU CosIng Annexes (II, III, IV, V; Cocamidopropyl Hydroxysultaine not listed): https://ec.europa.eu/growth/tools-databases/cosing/reference/annexes
CLP Annex VI Harmonised Classifications (no harmonised classification for Cocamidopropyl Hydroxysultaine): https://echa.europa.eu/information-on-chemicals/annex-vi-to-clp
Other regulators:
U.S. FDA cosmetic ingredients (cosmetic surfactant, no special restriction; not an approved food additive): https://www.fda.gov/cosmetics/cosmetic-ingredients
Health Canada Cosmetic Ingredient Hotlist (Cocamidopropyl Hydroxysultaine not listed): https://www.canada.ca/en/health-canada/services/consumer-product-safety/cosmetics/cosmetic-ingredient-hotlist-prohibited-restricted-ingredients/hotlist.html
Environment and Climate Change Canada, CEPA Schedule 1 (not listed): https://www.canada.ca/en/environment-climate-change/services/canadian-environmental-protection-act-registry/substances-list/toxic/schedule-1.html
IARC List of Classifications (not classified): https://monographs.iarc.who.int/list-of-classifications/
NTP 15th Report on Carcinogens, Appendix G (not listed): https://ntp.niehs.nih.gov/whatwestudy/assessments/cancer/roc
California Proposition 65 List (not listed): https://oehha.ca.gov/proposition-65/proposition-65-list
PubChem records (chemistry, identifiers, hazard codes):
Cocamidopropyl Hydroxysultaine is a coco-acyl mixture with no discrete CID; representative compound Lauramidopropyl Hydroxysultaine, PubChem CID 83841: https://pubchem.ncbi.nlm.nih.gov/compound/83841
Natural cosmetic standards:
COSMOS-standard approved raw materials (checked): https://www.cosmos-standard.org/en/databases/approved-raw-materials/
NATRUE certified/approved raw materials (checked): https://natrue.org/natrue-certified-world/
Skin allergy resource:
American Contact Dermatitis Society (ACDS), Helpful References, including Core Allergen Series 2020 (Cocamidopropyl Hydroxysultaine not listed): https://www.contactderm.org/resources/helpful-references
Guin JD. (2000). Reaction to cocamidopropyl hydroxysultaine, an amphoteric surfactant and conditioner. Contact Dermatitis 42(5):284. PMID 10789849: https://pubmed.ncbi.nlm.nih.gov/10789849/
Weber B, Arora P, Karels S, Neeley A. (2025). A Case Series Demonstrating Co-Reactivity of a Cocamidopropyl Hydroxysultaine-Containing Facial Cleanser with Dimethylamines and Amidoamine. Dermatitis. PMID 40936378: https://pubmed.ncbi.nlm.nih.gov/40936378/
Advocacy groups:
Environmental Working Group (EWG) Skin Deep entry for Cocamidopropyl Hydroxysultaine (hazard score 1; contamination concerns flagged): https://www.ewg.org/skindeep/ingredients/701523-COCAMIDOPROPYL_HYDROXYSULTAINE/
Last verified: 2026-06-29
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Do you know of any good surfactants that go well with Sodium Cocoyl Isethionate? In a foaming scrub it pairs that ingredient with cocamidopropyl betaine. At first I was thinking of using cocomidopropyl hydroxysultaine…. It is so hard to find good ingredients for things. I do use the EWG but like you said research still needs to be done even with it.
Hi, Julie! Thank you for reaching out to us! Irina will be happy to help you with your question in a private consultation.
This was an incredibly helpful article. I’ve been having horrible eyelid swelling and itching reaction from one of my skincare products and finally narrowed it down to my CeraVe Foaming Face Cleanser. The #2 ingredient is cocamidopropyl hydroxysultaine, and I’m pretty sure impurities in that are the root cause of the problem. Thanks for educating me about the manufacturing process and the fact that it’s not necessarily the ingredient itself but the traces of DMAPA and other impurities. Hoping I can find a decent cleanser without these surfactants. I usually double cleanse in the evening, so I need something with enough cleansing power to get my oil-based cleanser off, and unfortunately a lot of them have this ingredient.
Hi, Stephanie: you are absolutely right that cocamidopropyl hydroxysultaine and cocamidopropyl betaine are so hard to avoid. And I’m sorry to hear about your challenges. In my shop I have some cleansers without these ingredients: https://ireadlabelsforyou.com/product-category/healthy-skin/ Have you seen it? ~Irina
I keep referring back to this article. It is so helpful. Thank you! I have a problem with contact dermatitis on my forehead and this article has highlighted both the sensitizing properties of surfactants whose names end in -dopropyl and the difference between Coco-Betaine and Cocamidopropyl Betaine. Thanks again!
You are very welcome, Stephanie! Thank you for reading! ~irina
Hi Irina, thanks for the overview of this ingredient and thoughtful comparisons to Cocamidopropyl betaine. I think the safety of these ingredients come down to the sourcing and manufacturing process. The problematic compounds are found in the lower quality versions of these ingredients. They can be produced in a fashion that is safe, but as consumers, we only see the ingredient name. The quality of the ingredients are often unclear when in a list on the back of the tube.
Hi, Marc: I would agree with that. Thank you! ~Irina
I’m sensitive to Cocamidopropyl Betaine. Three questions:
1) Does that mean I am allergic to coconut, in general?
2) Since I’m allergic to CAPB, should I also stay away from Cocamidopropyl Hydroxysultaine ?
3) What body, hair, and cleaning products would you recommend that don’t have those ingredients?
Hi, Grace: Scientists believe that people who are allergic to CAPB, are allergic to its contaminants, not to coconut. There is no true coconut in CAPB as it is a highly processed ingredient. Thus, most likely you are not allergic to coconut. However, you should get a patch test to coconut to make sure that you are allergic to coconut to be 100% sure. If you are allergic to CAPB, it is possible that you are allergic to Cocamidopropyl Hydroxysultaine, too. Products that you see in on my blog and Shop, do not contain these ingredients: https://ireadlabelsforyou.com/shop/ You are here for a treat. Here is a shampoo that I like: https://ireadlabelsforyou.com/safest-shampoos-conditioners/ ~Irina
Can you clarify :Cocamidopropyl Hydroxysultaine was found to be genotoxic in concentrations up to 50%. what does that mean exactly? If its over 50% its not genotoxic? Thank you this is a great breakdown and I am comparing Meyer’s vs Softsoap vs Neutrogena (body wash)
Thank you for reading it, Nicholas!! I omitted “not.” I made the correction – please take a look. ~Irina
Is it coconut derived? How can you tell if there are coconut derived ingredients under different names in products for people with a nut allergy?
Hi, Jenny: You have to read Cosmetic Ingredient Review reports to learn about the derivation of ingredients. Yes, I believe Cocamidropropyl Hydrosultaine is coconut-derived. ~Irina
Just read several of your articles in doing research on chemicals. Appreciate the helpful information, especially in breaking down the chemical processes as well as the EWG’s findings. Read your honest personal story too. I have hashimoto’s. Standard medical practice doctors here in the midwest just treat the symptoms. I’m 68 yo. Stopped eating meat years ago because one of our sons educated me on the benefits. Helped me with several food allergies. But I could not give up dairy until recently when I went on a plant based diet, which has helped a lot more. However, trying to find all organic body care products sans chemicals is difficult to say the least. I will be using your advice a lot. Thank you. Mary
Hi, Mary: I am happy about your successful experience. You are absolutely right that whatever we put on our bodies, inhale, and ingest as dust matters too. I hope you can take advantage of my consultation service as well. ~Irina
I really enjoy when you break down ingredients this way. It is so enlightening and the article is short enough that it’s not overwhelming or alarmists.
Thank you so much for all you do!
Hi, Netty! Thank you so much for reading and saying that. It means a lot to me. Lately, I’ve been focusing on presenting confusing information in a more clear way…What shampoo do you use? ~Irina