Best All Natural Bar Soap: United By Blue
Won't harm ground water and many brands are hypoallergenic.
By Georgette Kilgore | Updated on October 6, 2021
The recent pandemic has caused us all to appreciate soap a little bit more, and these days, biodegradable soap is more readily available than before, and a popular choice for campers and outdoor enthusiasts.
But, did you know that there are levels and limits to the term “biodegradable?” Lathering up is an important way to stop the spread of germs, but many people wonder how good it is for the environment?
Finding a soap that leaves hands (and environmental consciences) clean isn’t a chore, if you know what to look for…
So, we’ve compiled a list of the best eco-friendly and biodegradable soap options available… check ’em out…
Won't harm ground water and many brands are hypoallergenic.
All Natural ingredients and great scent.
Reducing plastic waste.
Recycled packaging in a biodegradable soap that won't hurt the planet.
Liquid soap that's both eco-friendly and biodegradable.
Low suds but can be used in a number of ways.
Lots of hydrating oils.
Contains Tea tree for a natural disinfectant.
Soap sheets can be used with or without water and these are made from recycled paper.
Low cost soap sheets can be used without water.
Naturally repel insects.
Bar soaps are available in all sorts of sizes, scents and options. When choosing a biodegradable bar soap, look for products that are free from palm oil (unless it specifically states it’s sourced sustainably). The following products provide a rich lather and most have the added benefit of moisturizing skin, to reduce dryness.
Liquid soaps are fast and easy to use, but typically, that convenience is reflected in the carbon footprint of the liquid soap. These products, however, won’t harm the groundwater when used outdoors, and many are working to lower their footprint.
Biodegradable soap sheets are perfect for taking on the go, camping, or simply stashing in your bag. When made with essential oils, the cleaning power won’t dry your skin.
But not everything that suds is soap.
True soap differs greatly from a lot of the sudsy liquids used for washing hands, dishes, and laundry. True soap only needs three ingredients to do its job: Oil (vegetable or animal fat), water, and lye (Potassium hydroxide).3 Soap in this basic form (generally bar soap) is environmentally safe, biodegradable soap, as its natural components break down quite quickly with no adverse effect to the environment.4
With any other soaps labeled “biodegradable,” be sure to still avoid any potential harm and dispose of the suds correctly. Biodegradable soap is made to break down in soil, not water, so do your washing, bathing, and cleaning at least 200 feet away from any water sources. Then, simply dig a hole six inches deep to dispose of the soapy water in, so the bacteria in the soil can break it down effectively.
True soap is proven to be highly biodegradable,4 so it’s best to stick with simple soaps composed mainly of fats for washing and cleaning needs. From a health perspective, if a soap is biodegradable, it’s probably lacking potentially harmful and polluting chemicals. Biodegradability is a great gauge to not only measure the environmental impact of soap, but its toxicity for humans.
Saponification is a process that involves the conversion of fat, oil, or lipids,44 into soap and alcohol by applying heat in the presence of aqueous alkali (e.g. NaOH).45,46 Soaps are salts of fatty acids, and fatty acids are monomers of lipids that have long carbon chains (at least 10) e.g. sodium palmitate.47 Saponification reactions are generally exothermic and almost totally irreversible.48
Saponification can be defined as a “hydration reaction where free hydroxide breaks the ester bonds between the fatty acids and glycerol of a triglyceride,49,50,51 resulting in free fatty acids and glycerol,”52 which are each soluble in aqueous solutions. This process specifically involves the chemical degradation of lipids,53 which are not freely soluble in aqueous solutions. Heat-treated lipid residues are more difficult to remove than non heat-treated residues because of polymerization, which is the process in which small molecules combine to create a polymer. Saponification plays a critical role in cleaning lipids which are present in process areas involving cell growth and cell processing, such as bacterial fermentation and cell disruption process.54
Most liquid “soaps” — such body wash, hand soap, dish soap, and laundry detergents — derive their cleansing benefits from mostly synthetic suds-inducing surfactants,5 compounds which decrease the surface tension of water. Unlike the humble bar soap, most liquid “soaps” rely on loads of chemicals to generate a cleansing effect.
The general rule of thumb is liquid “soaps” are usually more synthetic than bar soap, and thus have greater environmental implications. Soaps of all kinds become worse for the environment and even human health in proportion to their added chemical fragrances, preservatives, dyes, and cleaning boosters. Many of these chemicals take a long time to break down naturally, if at all, and may pose risks to the human body during use.
Unfortunately, some detergents and “soaps” listed as “biodegradable”6 are only so in very exacting lab or industrial conditions, thus requiring astute attention to “plant-derived” ingredients. As always, it’s best to buy eco-friendly products with ingredients that are clear, few, and understandable.
Soap contributes a surprising amount of carbon to the atmosphere. According to the European Commission,7 various soaps, detergents, and other cleaning supplies emit 200 pounds of carbon dioxide (CO2) per person into the atmosphere every year. Scientists from the Zurich Institute of Environmental Engineering launched a life cycle assessment study of common household cleaning products,8 including soaps and detergents. The study considered every factor of soap’s life cycle, including manufacturing, transport and storage, use, and disposal.
The environmental impacts between bar soap and liquid soap/detergents were shocking, and not in a good way for fans of bottled suds:
That means it takes six times the amount of liquid soap to do the same job as bar soap. That magnification travels all the way up and down the soap’s value chain, meaning six times more raw materials and six times the space needed for transport and storage.
Aside from liquid soap’s carbon footprint, the surfactants, preservatives, dyes, and fragrances in it biodegrade quite stubbornly, whereas bar soap (mostly made from oils) degrades rather quickly.
However, the Swiss study did find bar soap has an environmental footprint twice as high as liquid soap, due to the fact that it is largely derived from plant oils (which are farmed). What is more, it takes more water to wash up with bar soap than liquid soap, and with it the environmental costs of heating and treating wastewater.
But if these plant oils can be sourced ethically and sustainably, it could still be a better option than liquid soap from a land-use perspective. Simply put, agriculture has the potential to heal soil and sequester carbon, whereas mines and refineries do not.
Regardless of the product, the majority of the carbon footprint occurs on the consumer level, not in production. Using soaps and detergents sparingly and efficiently will prove the best prevention to unnecessary greenhouse gas (GHG) emissions.
Conventional soap has a dirty carbon footprint in other ways:
A biodegradable soap is a step in the right direction, but there’s more to a truly environmentally friendly soap than that. All-natural, sustainable soaps are as good for humans as they are for the planet, taking into account all inputs and outputs of the products’ life cycle. What is more, they contain none of the potentially harmful chemicals present in conventional soaps, resulting in a healthy earth and healthy skin.
Eco-friendly soaps and detergents are available in bar, liquid, and powdered forms. When looking for the right product, the old adage “less is more” applies. Look for soap with the fewest ingredients possible, and all of them biodegradable. Keep in mind that some ingredients may sound like dangerous chemicals, though in reality they’re completely safe.
If an ingredient is in doubt, the Environmental Working Group’s Skin Deep ingredient database offers in-depth reviews on soap and detergent ingredients.10
Whenever possible, buy products that are Certified Organic and Fair Trade, and those that offset carbon emissions from their products.
Bar none (excuse the pun), bar soap is almost unequivocally the most eco-friendly option for cleaning up. Because of its solid composition, relatively low carbon footprint, and often compostable packaging, bar soap has the least amount of processing footprint, fewer ingredients, uses less water in production, and (usually) lasts longer ounce-for-ounce when pitted against liquid detergents.
When choosing bar soap, be sure to check the ingredients list for any of the chemicals mentioned later in this article. Alternatively, purchase locally-made products, which have a much lower carbon footprint. Many of these soaps are of exceptional quality and made with all-natural ingredients, and can be found at local farmers markets and boutiques.
If it isn’t clear by now, biodegradability doesn’t promise eco-friendliness. Palm oil, a completely biodegradable product, is one of the most unethical “natural” commodity products on the market.11 Palm oil is found in over half of packaged U.S. products, including many soaps. Palm oil requires destructive clearing of tropical rainforests,12 which destroys critical habitat for endangered species and devastates indigenous communities. In Malaysia and Indonesia, clearing rain forests to make way for palm plantations emits roughly 500 million tons of carbon dioxide every year, representing 1.4 percent of global net carbon emissions.13 Palm oil emitted 25-36 billion tons of carbon dioxide per year from 2000-2015.14
Liquid soap is an essential for washing hands and dishes. Thankfully, plenty of sustainable options exist for environmentally-conscious consumers.
Many big-name brands are looking to get their slice of the eco-friendly detergent and soap pie. Major producers now produce countless plant-based dish soaps, hand soaps, and laundry detergents.
When purchasing liquid soap and detergents, consider purchasing them in pouches, refillable containers, or recycled/compostable material. Buying in bulk is also a great option.
Keep in mind some plant-based soaps and detergents still contain chemicals that aren’t easily biodegradable. If there are too many non-biodegradable ingredients or you have doubts, it’s always a good idea to just opt for good ‘ol fashioned natural bar soap.
Still, mostly plant-based liquid soaps and detergents are superior to conventional products, which contain a slew of harmful chemicals and petroleum byproducts. A recent study discovered replacing every United States home’s petroleum-based laundry detergent would save 149,000 barrels of oil every year.19
Skin is the largest organ in the body, and absorbs 64 percent of what is put on it.55 The average soap product likely contains some form of potentially dangerous compound that could hurt you or the environment.
The best organic soaps are free from the worst toxins, meaning fewer potentially harmful chemicals will be absorbed into the skin. They have a pH similar to conventional soaps, so the pH drying factor of organic vs. inorganic soap is inconsequential. However, many of the toxins present in average soap are known desiccants.
One of the key differentiators between eco-friendly soap and their dubious counterparts is the use of saponification over surfactants. Where surfactants artificially create a lathering effect, saponification naturally converts fats and oils into soap. Here’s a list of all-natural, safe ingredients common in eco-friendly, biodegradable bar soap:
Here’s a list of common soap ingredients to steer clear from… they are horrible for both you and the groundwater:
The decision to purchase the best natural soap depends on more than the ingredients list. The producer should also adhere to a strict environmental ethos and regard for social justice. This means ethical ingredient and labor sourcing, use of recycled or compostable packaging, and having their carbon footprint erased by using a tree planting offset offered by one of the best carbon offset providers out there. (Individuals can figure their emissions with an ecological footprint calculator.)
Finding the best all-natural, organic, biodegradable soap is an important step in reducing carbon footprint in everyday life. From cradle to grave, soap products contribute a surprising amount of social and environmental detriment, from CO2 emissions and deforestation to negative impacts on human and ecological health.
Replacing conventional soap with all-natural, biodegradable products may cost a bit more in the short term, but represents an investment in a world where soap doesn’t harm the planet. As a plus, the immediate health and environmental benefits of buying all-natural biodegradable soap is worth every extra penny.
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