Aluminum Chlorohydrate
Aluminum compounds are used in antiperspirants to block sweat ducts.  These compounds create a chemical reaction with your sweat and clump to clog your sweat glands, it may cause irritation in sensitive underarm areas. This may result in allergic reactions like contact dermatitis, acne or itching.

Benzalkonium chloride
It is an organic salt classified as a quaternary ammonium compound, used as a preservative in moisturizers and associated with severe skin, eye, and respiratory irritation and allergies. Found in: sunscreens, moisturizers.

Synthetic antioxidants used to extend shelf life. They are possible carcinogens and hormone disruptors and are toxic to aquatic life. Found in: lipsticks, moisturizers, and other cosmetics.

An organic compound used as for viscosity control and fragrance additive. It is classified as a skin irritant and may be a human endocrine disruptor.

Coal Tar
A byproduct of coal processing and a known carcinogen, used in hair dye and dandruff shampoos.

Methylisothiazolinone and Methylchloroisothiazolinone (MI) (MCI)
A preservative used in lotions, skincare, and hair products that causes significant allergies and skin irritation.

Microbeads (as an exfoliator)
These tiny bits of plastic aren’t biodegradable and end up in our lakes, rivers, and ocean. Look for: microbeads, microabrasives, Polypropylene, Polyethylene.

Mineral Oil
A liquid by-product of refining crude oil to make gasoline and other petroleum products. While it is generally recognized as safe when found in cosmetics, there is a possibility it could be contaminated with PAH’s. Because it is a product of petroleum, it is not a renewable resource. 

Usually found in sunscreens and various other cosmetics. Studies have show that because of their size, these particles are able to penetrate the skin and make their way into the bloodstream. Because there is insufficient evidence to show whether these particles will cause damage or not, Sentrel will not carry products containing nanoparticles.

Oxybenzone has one of the highest penetration percentages in lab studies (1-9%) and acts like estrogen. It has been associated with endometriosis in women and has high rates of allergic reactions as well as contributing to the decline of coral reefs.

Parabens (methyl-, isobutyl-, propyl-, ethyl-)
Preservatives used to prevent the growth of bacteria and mold. Parabens are endocrine (or hormone) disruptors. Found in: shampoo, face cleanser, body wash, body lotion, foundation.

Phthalates  (DBP, DEHP, DEP)
A class of plasticizing chemicals used to make products more pliable or to make fragrances stick to skin. Usually found in synthetic fragrance, nail polish, and hairspray.  Phthalates disrupt the endocrine system, can cause developmental and reproductive toxicity, toxic to aquatic life, and be contaminated with 1,4 dioxane and ethylene oxide.

Sodium Lauryl Sulfate and Sodium Laureth Sulfate (SLS and SLES)
These sulfates are harsh surfactants found in shampoo, body wash, and other products that sud. They commonly cause skin irritations and trigger allergies. They are often contaminated with 1,4-dioxane. .

Synthetic flavor or fragrance
An engineered scent or flavoring agent that may contain any combination of chemical ingredients, including hormone disruptors and allergens. Fragrance formulas are protected under federal law’s classification of trade secrets and therefore can remain undisclosed. Found in: all types of cosmetics. Any product at Sentrel with a “fragrance or parfum” has been confirmed as naturally derived and phthalate-free.

Retinyl palmitate and Retinol (Vitamin A)
A nutrient that may damage DNA and speed the growth of skin tumors when used topically. Found in: moisturizer, anti-aging skincare.

Found naturally in crude oil and in the tolu tree, its used in nail products to suspend the color and form a smooth finish across the nail. It is known to cause developmental and reproductive toxicity, organ system toxicity, and irritation.

Triclosan (TSC) and triclocarban (TCC)
An antimicrobial agent found in a wide variety of antibacterial soaps and detergents, known to cause endocrine disruption, promotes triclosan-resistant bacteria that are resistant to both antibiotic medications and antibacterial products, and toxic to the aquatic environment.

Contaminants- these will not be listed as ingredients rather they are byproducts of listed ingredients or of a process involving listed ingredients.

Found in products that create suds, like shampoo, liquid soap, and baby bubble bath. We confirm with all of our partners their products are tested and free from 1,4-dioxane. 

Ethylene Dioxide
A lot of manufacturers use cheap harsh raw materials.  To make them less irritating to the skin, ethylene oxide is added to create a chemical reaction called ethoxylation.  The finished products may contain traces of unreacted ethylene oxide. We confirm with all of our partners their products are tested and free from ethylene dioxide. . 

There are ingredients that are used as preservatives in many cosmetics that release formaldehyde over time. Formaldehyde is a known carcinogen that is also linked to asthma, neurotoxicity, and developmental toxicity.

PAH’s (Polycyclic Aromatic Hydrocarbons)
An ingredient that is considered reasonably anticipated to be a human
carcinogen. Ingredients that could possibly be contaminated with PAH’s are:
1. Petroleum jelly
2. Coal tar




Occupational Safety and Health Administration, Journal of Women’s Health, United States Environmental Protection Agency, U.S. Department of Health and Human Services, US National Library of Medicine- National Institutes of Health, Environmental Working Group,