Plant-based – Yes – palm oil
Skin Irritant - Mild
Environment Hazard – Relatively Low
Biodegradable – Readily
CAS – 57-11-4
What is Stearic Acid
Stearic Acid is one of the most commonemulsifying agent. It helps other emollients bind together and stabilizes the formula that contain fragrances. Stearic Acid can moisturize the skin and it can protect the hair shaft by coating it without leaving the hair feeling heavy or looking dull.
Is Stearic Acid safe to use? Is it nontoxic?
The triple pressed stearic acid that we use is safe and not toxic to the environment. However, if using pure stearic acid it could cause skin, eye and respiratory irritation. According to a NOAA report there is no current information available if it is toxic to aquatic life. Some research has been done and documented about the oral toxicity of stearic acid. Since we do not deal in food items, I have not added that information to this article.
In Summary
Rustic Strength uses stearic acid in our lotions and conditioners to help with moisture retention and protection of the hair shaft. It is widely accepted material in cosmetics and food. Stearic acid is readily biodegradable with little to no toxicities. 
If you have any questions regarding this or any other chemical we use feel free to reach out to customercare@rusticstrength.com We would be more than happy to answer your questions.
We invite you to do your own research!
Scientific journals and articles are the foundation of evidence-based decisions at Rustic Strength. Blogs can provide helpful information. However, if it can not cite scientific articles, its claims stand on little.
EPA Safe Ingredient - https://www.epa.gov/saferchoice/safer-ingredients#scil
EWG® Score = https://www.ewg.org/skindeep/ingredients/706311-STEARIC_ACID/
EU - https://echa.europa.eu/substance-information/-/substanceinfo/100.000.285
Plant-based - SDS and manufacturers statement on file
Skin Irritant - https://journals.sagepub.com/doi/10.3109/10915818709098563
Environment Safe - https://pubchem.ncbi.nlm.nih.gov/compound/Stearic-Acid#section=Toxicity
Biodegradable - https://echa.europa.eu/registration-dossier/-/registered-dossier/14937/5/3/2#
Common - https://en.wikipedia.org/wiki/Stearic_acid
Emulsifying - https://www.mdedge.com/dermatology/article/78248/aesthetic-dermatology/stearic-acid?reg=1&icd=login_success_email_match_norm
Safe - https://journals.sagepub.com/doi/10.3109/10915818709098563
not toxic - https://online.personalcarecouncil.org/ctfa-static/online/lists/cir-pdfs/FR777.pdf
pure stearic - https://www.medicalnewstoday.com/articles/stearic-acid#what-is-it