You've probably heard about surfactants if you are into DIY, human-safe cleaning and personal care products.
Surfactants are the backbone of cleaning products —compounds that enhance the cleaning, foaming, conditioning, and emulsification properties of soaps, detergents, and various other household and industrial products.
There are synthetic surfactants, naturally derived synthetic surfactants, natural surfactants, and natural soaps with varying degrees of toxicity. Some synthetic surfactants are highly toxic, and a few, such as natural soaps, natural surfactants, and some naturally derived synthetic surfactants, are safe alternatives.
In this article, you’ll learn to discern a safe surfactant from a toxic one, spot them on labels, and find the best alternatives.
Surfactants are a type of compound that reduces the surface tension of water.
They are widely used in cleaning and personal care products because they facilitate water emulsification with other cleaning ingredients and help stir up and remove dirt, grime, and debris.
Here’s a quick explanation of how a surfactant works within a cleaning product to make the formula come alive.
When surfactants are added to water, their molecules combine to create structures called micelles.
Micelles allow the water-loving components of the surfactant (known as hydrophilic* heads), which, in most surfactants, are electrically charged to attract and surround soils, while the water-hating components (known as hydrophobic** tails) remove the surrounding soils from the surface and into the cleaning product.
*hydro=water / philic=loving
**hydro=water / phobic=hating or fearing
Surfactants also act as:
Surfactants are classified based on their method of action. The following is a fundamental, non-technical description of surfactants.
Surfactants are categorized into four types based on the charge of the active part of the molecule called the hydrophilic heads. The charge may be positive, negative, or neutral. The surfactants are further classified according to their origin - natural or synthesized from natural or petroleum products.
EWG Healthy Cleaning rates surfactants overall as an F, as some pose prodigious environmental and human health challenges. Many are non-degradable and persistent, producing by-products with ecological, human, and aquatic health consequences.
But, there is a wide range of surfactants - from safe, natural soaps, natural surfactants, and naturally derived synthetic surfactants to the very toxic cationic surfactants and the anionic surfactants containing PFAS chemicals.
Anionic surfactants (EWG-rated F overall) have a strong negative charge, are high-foaming, and are exceptionally effective cleaners but are considered irritants. They are the predominant surfactants used in hard surface cleaners.
Anionic surfactants are highly effective cleaning agents, but there are caveats.
The safe, natural soaps are anionic surfactants used as cleaning agents for thousands of years. The caveats:
Synthetic anionic surfactants have some safer options, while others are highly toxic.
Safer options - some with restrictions:
Two familiar examples are sodium laureth sulfate (SLES) and sodium lauryl sulfate (SLS), popular anionic surfactants in cleaning products.
Other synthetic anionic surfactants are full of caveats:
In fact, anionic surfactants include a group of surfactants with a very dark side.
Given their widespread use and toxicity issues, we must become aware of toxic anionic surfactants (especially the PFAS-containing surfactants) used in our personal care, baby care, cleaning, food, and laundry products.
The PFAS-containing surfactants have no place in a healthy home and should be avoided in cleaning, laundry, or personal care products.
Nonionic surfactants (EWG-rated D overall) have no charge and are the mildest of the surfactant categories. They are highly effective cleaning agents with exceptional degreasing properties.
Like anionic surfactants, nonionic surfactants are powerful cleaning agents, but there are caveats.
The mild alkyl glucosides (EWG-rated 2) are the stars that shine the brightest in the entire range of surfactant categories.
Important note: The alkyl glucosides are technically correctly identified as naturally derived synthetic surfactants even though they are commonly referred to as natural surfactants.
The reason for using the word synthetic in the description is not because they are derived from a petroleum product and highly processed but because of the number of steps taken to process the natural source - coconut, palm, or rapeseed (canola) oils - to create the surfactant.
This is tantamount to the term “processed or refined food” when referring not to a chemicalized process or chemical addition but a simple process like taking a kernel of wheat and grinding it into flour. That step of grinding makes a flour product a processed food.
Cationic Surfactants
Amphoteric Surfactants
Awareness and concern about the ecological impacts of surfactants have, in general, superseded human health concerns. The environmental risks of synthetic surfactants are enormous.
Yet, many scientists, experts, and chemical, cosmetic, agricultural, and cleaning companies continue to tout toxic synthetic surfactants as safe, effective, and essential.
This is unconscionable and another example of regulatory agencies asleep at the wheel regarding their documented toxicity to humans and the environment.
For example, according to a 2021 scientific paper published in Environmental Science and Pollution Research International, synthetic surfactants have enormous adverse effects on humans and the environment. They are among the most challenging emerging contaminants as they constantly enter our waterways from our sinks, dishwashers, showers, washing machines, etc.
This quote from the paper speaks volumes about the safety concerns of surfactant pollution.
“Some of the commercially available surfactants pose a severe environmental and public threat to humans and ecosystems. For instance, anionic surfactants, predominantly linear alkylbenzene sulfonates (LAS), cause biochemical, pathological, physiological, and other impacts on aquatic/terrestrial ecosystems (Petrie et al.2015; Zhu et al.2018). Also, LAS causes skin irritation and respiratory problems (Collivignarelli et al.2019) and reduces the resistance of aquatic biota against environmental stress, reproduction, and growth processes (Hampel et al.2012; Moura et al.2019). Surfactants usually increase the solubility of contaminants and thus facilitate eutrophication (Zanoletti et al.2017). Also, the increasing hydrophobic properties of the surfactants proportionally increase their toxicity (Borghi et al.2011). These vast impacts consequently raise public health and environmental concern about the high concentration of surfactants.”
The paper also discusses concerns about synthetic surfactants finding their way into drinking water due to the challenges of removing them from wastewater, which often finds its way back into our water supply.
Another paper titled “Surfactant pollution, an emerging threat to ecosystem: Approaches for effective bacterial degradation: published in the Journal of Applied Microbiology, states that synthetic surfactants can penetrate cell membranes and thus cause toxicity to living organisms.
Surfactant accumulation can cause significant gill damage and loss of sight in fish. At the same time, their ability to alter the physiological and biochemical parameters of water decreases the amount of dissolved oxygen, negatively affecting the entire ecosystem and allowing dangerous bacteria to thrive.
Bottom line: Toxic surfactants are a ubiquitous and persistent environmental disaster, especially for aquatic life. These ingredients have no place in a healthy home and should be avoided in cleaning, laundry, or personal care products.
Research clearly shows that many synthetic surfactants have serious human health implications.
This fact has largely been ignored as a priority in formulating cleaning products as they are ubiquitous in cleaning products, laundry products, personal care products, hair care products, and anything that contains detergent and foams.
For example, acute and chronic exposure to anionic surfactants alone have been linked to the following adverse reactions:
In general, harmful synthetic surfactants are a serious concern for the environment and are considered among the most challenging emerging contaminants to control as they are constantly entering our waterways from our sinks, dishwashers, showers, washing machines, etc., and have “enormous adverse effects on humans and the environment.
As you can see, surfactants' human and environmental are intimately intertwined. So it’s in our very best interest to choose human-safe alternatives.
As discussed, synthetic surfactants are used in household cleaning and personal care products.
They’re also used in the production of dyes, pigments, and pesticides.
Here’s a quick reference list of common products that may contain synthetic surfactants:
Reading labels can go a long way in helping protect yourself from toxic surfactants. However, cleaning companies are not required to list all ingredients on their labels. If there is no ingredient list, that is a toxic red flag. The product should not be used or kept in the home.
For cleaning products with an ingredient list, we recommend using The Environmental Working Group’s Skin Deep database and app, which rates ingredients in cleaning and personal care products on a scale of “1” (least toxic) to “10” (most harmful). We suggest that all ingredients in each product kept in the home be EWG rated a one or two (with some exceptions).
Learn more in 3 Tools You Need To Become Your Own Product Advocate.
Check out this document if you want a deeper dive into surfactant chemistry and technical details.
You'd think t here were no safer, natural alternatives at the rate toxic synthetic surfactants are used. Fortunately, as mentioned above, that is not true! Here is a short review of safe surfactants - natural surfactants, natural soap, and naturally derived synthetic surfactants.
Various natural surfactants not mentioned in the four categories above are utilized in some human-safe cleaning and clean beauty products.
Natural surfactants, such as soapwort and other saponin-containing plants, have been used as cleaners and soaps for millennia. People noticed that when they used the leaves of these plants to help wipe off dirt at a stream, the saponins in these plants would foam and lather and aid in cleaning.
These surfactants are all rated a one by EWG, are unrefined botanicals, and are biodegradable. However, they have the potential to be skin and eye irritants and can be difficult to stabilize in formulas.
For DIY products that do not require consistent, uniform foaming and product presentation results, saponin-containing, 100% unrefined botanicals can often be used as natural surfactants.
Some examples include:
Natural soap is nature’s original anionic surfactant!
Liquid natural soaps, like castile soap, can be used as a natural base for nearly any DIY cleaning product or personal care cleanser.
Some of our favorite fragrance-free natural soaps include:
We recommend choosing an unscented natural soap to avoid exposure to synthetic fragrances.
Note: The disadvantages of natural soaps in cleaning products are the following:
Branch Basics wanted to create a product that not only cleaned well but, first and foremost, was safe to use. We wanted a formula that didn’t irritate the skin, eyes, and lungs and leave a soap scum. That is why we chose the following category of safe surfactants, the nonionic alkyl glucosides, for our formula.
Today, we have access to the stable, predictable, efficacious, human-safe natural surfactants, the alkyl glucosides. Alkyl glucoside surfactants are derived from coconut, rapeseed, corn, and sugar cane plants.
Branch Basics chose the cleanest, most human-safe, plant-based, naturally-derived versions of the glucoside family, Coco Glucoside and Decyl Glucoside, along with other ingredients proven to be safe. Our Concentrate is MADE SAFE certified and has been third-party verified not to be an eye or skin irritant.
These surfactants are rated “two” by EWG, come from non-GMO renewable plant sources, do not irritate the eyes, skin, or lungs, have no by-products, are 100% biodegradable, and are suitable for even babies and the most delicate skin.
If you’re ready to break up with synthetic surfactants without sacrificing cleaning power, you must check out Branch Basics.
Branch Basics Starter Kits (available in reusable plastic or glass) contain everything you need to replace every single cleaning and laundry product in your home with just one powerful Concentrate. Talk about simplifying your life!
We also offer:
Beyond products, our Wellness Center offers hundreds of articles, podcasts, and guides on everything natural cleaning, holistic nutrition, natural parenting, and more to empower your human-safe lifestyle.
We hope this information will help you on your journey to create a healthier home and family.
Want more information on Phosphate ester surfactants, Tristyrylphenol Ethoxylates, Castor Oil Ethoxylates? Click the link below to contact us.