Sulphur is one of the most powerful natural healing minerals for pet skin — but constant confusion with sulphates, SLS and sulpha drugs has given it a bad name. Here’s the chemistry, clearly explained.
A question we get all the time
We often get questions from customers about ingredients in our products. One of the most common confusions surrounds sulphur-containing compounds. Some are beneficial. Some are vital to cellular function. Some are caustic and toxic. Some are antibiotic medicines. They all share three letters of name — and almost nothing else.
This is the short version.
What is sulphur?
Sulphur is the elemental mineral — pure, bright yellow, crystalline. It’s known as the healing mineral for very good reasons:
- Toxic to the scabies mite — direct topical kill
- Antibacterial — natural disinfectant action
- Potent antifungal — works on yeast and other skin fungi
In DERMagic Skin Rescue Lotion, sulphur provides proven relief from itchy skin and is the only topical product on the market that can reverse a systemic yeast infection — with no harmful side effects.
Beyond its topical role, sulphur is essential to all life. It’s used in biochemical processes throughout the body:
- A component of vitamins biotin and thiamine (thiamine is named for the Greek word for sulphur)
- A part of the amino acids cysteine and methionine — so present in every protein
- An active part of many enzymes
- A component of antioxidant molecules like glutathione and thioredoxin
- The disulphide bonds in keratin are what give hair, skin and feathers their mechanical strength
Elemental sulphur is non-toxic to animals, including humans. It can even be taken internally as a mild laxative.
What sulphur is not
This is where the confusion starts. Three different families of chemicals get tangled together — and only one of them is what’s in the lotion.
Sulphates
Sulphates are compounds formed when elemental sulphur burns in air:
S + O₂ → SO₂ (sulphur + oxygen = sulphur dioxide)
2 SO₂ + O₂ → 2 SO₃ (sulphur dioxide + more oxygen = sulphur trioxide)
When these compounds encounter water — in the atmosphere or in the lungs — they form sulphurous or sulphuric acid. Highly caustic. Sulphate aerosols from fossil fuel and biomass combustion are major contributors to acid rain.
So: sulphur and sulphates are related, but they are as different as the free nitrogen in the air you breathe is from the nitrates in nitric acid.
Sodium Laurel Sulphate (SLS)
When pet product manufacturers claim their products are “sulphate-free,” they usually mean Sodium Laurel Sulphate or the closely related sodium laureth sulphate. SLS is a powerful surfactant used industrially in:
- Engine degreasers
- Floor cleaners
- Car wash soaps
It’s also added to toothpastes, shampoos, shaving foams and bubble baths for its thickening and lather-creating effects. Studies have shown SLS can:
- Irritate facial skin with prolonged exposure (more than an hour)
- Worsen skin problems in individuals with chronic skin hypersensitivity
- Cause skin and eye irritation in animal studies
Most pet shampoos contain SLS. Dermagic products do not.
Sulpha drugs (sulphonamides)
The other common confusion. Sulpha drugs — sulphonamides — are a class of antibacterial medications containing the sulphonamide chemical group (sulphur, oxygen and nitrogen). Sulpha allergies are common in people and the medications are prescribed carefully.
But: sulphonamides are chemically unrelated to sulphates, sulphites, or elemental sulphur. A sulpha allergy does not mean a sensitivity to sulphur or to Dermagic products.
Why this matters for your pet
When you choose Dermagic, you’re getting elemental sulphur — the healing mineral, the antifungal, the antibacterial, the antiparasitic — without any of the caustic sulphate compounds and without the SLS detergent that strips a dog’s single-layered skin.
That’s the chemistry behind the relief. Pure elemental sulphur, alongside aloe, vitamin E, beeswax and a carefully chosen panel of essential and plant oils — doing what nature does best.
For specific ingredient questions email info@dermagic.eu or call 01624 829575 — we love to talk about this.