Selsun Shampoo Ingredients: A Comprehensive Look at Selenium Sulfide and Friends

SEL SUN Blue Deep Cleansing Anti-dandruff Shampoo contains Selenium Sulfide to control dandruff and the recurrence of flaking and itching associated with dandruff, from the first wash. For best results, use regularly.

Core active ingredient and purpose

Selenium sulfide is the primary medicated component used to treat dandruff and seborrheic dermatitis. Selenium sulfide 1% and 2.5% strengths are used on the scalp to help control the symptoms of dandruff and seborrheic dermatitis. Selenium sulfide 2.5% strength is used also on the body to treat tinea versicolor (a type of fungus infection of the skin).

Other active and supporting ingredients

Water acts as the main solvent in cosmetic products and is purified and deionized. It is usually the main solvent in cosmetic products and helps form stable formulations. A mild and non-drying cleanser that gives skin a nice and soft after-feel is described in the draft as a real oldie but a goodie.

A big molecule created from repeated subunits (a polymer of acrylic acid) that magically converts a liquid into a nice gel formula; it usually has to be neutralized with a base for thickening to occur and it creates viscous, clear gels that also feel nice and non-tacky on the skin.

Fragrance is the generic term for nice smelling stuff put into cosmetic products so that the end product also smells nice. If you are someone who likes to know what you put on your face then fragrance is not your best friend-there’s no way to know what’s really in it. Also, if your skin is sensitive, fragrance is again not your best friend.

Cocamidopropyl betaine is great at stabilizing bubbles in cleansing products; it’s mild and works well combined with other cleansing agents and surfactants, contributing to a soft after-feel.

Dimethicone is a common silicone used in skincare and haircare. In skincare, it forms a protective barrier (occlusive) and helps fill in fine lines and provide a plump look temporarily. In haircare, it is a non-volatile silicone that smoothes hair and helps prevent moisture loss, though it can be challenging to wash out for some hair types.

Citric acid is an AHA derived from citrus fruits; however, comparative studies have suggested it has less skin-improving magic properties than glycolic or lactic acid. It helps adjust pH and can contribute to stability in formulations.

Glycolic and lactic acids are other AHAs noted in the draft as having stronger skin-improving properties relative to citric acid.

Preservatives described as “pretty much the current IT-preservative” help keep products safe over time. Parabens, historically common preservatives, are described as controversial in the draft but are presented as safer or gentler in certain contexts.

Titanium Dioxide is a physical/inorganic UV-filter noted for broad spectrum coverage and stability, but often leaves a whitish tint. Nanoparticles are used to improve cosmetic elegance, though their safety remains under investigation; a 2009 review article summarizes that current studies have not demonstrated percutaneous penetration of nanosized particles in titanium dioxide sunscreens.

How the ingredients interact with dandruff treatment

The combination of selenium sulfide with other cleansing agents and surfactants can yield effective dandruff control from the first wash when used regularly as directed. Wet hair thoroughly, shake the bottle well, and apply the medicated shampoo to the scalp, allowing it to work before rinsing. For tinea versicolor, follow specified topical use guidelines and rinse thoroughly.

In formulations, water supports cleansing and solvent properties; surfactants such as cocamidopropyl betaine stabilize bubbles and improve lather, aiding distribution on the scalp. Silicones like dimethicone provide slip and barrier protection, while AHAs and other acids can influence formulation stability and skin compatibility.

Usage hints and safety considerations

For best results, use regularly and follow the product’s directions. Avoid contact with eyes or damaged skin. This medicated shampoo can interact with other topical treatments, and usage around hair coloring or chemical treatments should be timed carefully. If you are considering body use for fungal infections like tinea versicolor, apply as directed to affected areas and rinse thoroughly.

As with all cosmetic and pharmaceutical products, some individuals may experience skin irritation or sensitivity to certain ingredients such as fragrance or preservatives. If any adverse reaction occurs, discontinue use and consult a healthcare professional.

Selsun shampoo ingredient chart

Infographic shows active ingredient Selenium sulfide and common supporting ingredients in medicated shampoos.

How to Apply Selenium Sulfide Lotion (UPDATED)

Short instructional video on how to apply medicated shampoo and rinse properly for dandruff control.

Table of key ingredients and roles

IngredientRole
Selenium sulfideMedicated anti-dandruff active (scalp and seborrheic dermatitis)
Water (deionized)Solvent and base for formulation
Cocamidopropyl betaineSurfactant; stabilizes bubbles; mild cleansing
DimethiconeSilicone; barrier, shine, and conditioning
Citric acidpH adjuster; stabilizer
FragranceFragrance; cosmetic pleasantness
Titanium DioxideUV-filter agent; broad spectrum protection; potential white cast

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