What Is Sodium Oleth-7 Phosphate?
Sodium Oleth-7 Phosphate is a synthetic ingredient made by reacting oleyl alcohol, which comes from naturally occurring oleic acid in vegetable oils like olive or sunflower, with ethylene oxide to add seven ethoxy units. The resulting molecule is then combined with phosphoric acid and neutralized with sodium to produce a water-soluble phosphate salt. First introduced in the late 20th century when formulators were looking for milder alternatives to traditional sulfates, it quickly gained popularity for its balanced cleansing power and skin-friendly profile.
Because of its ability to mix oil and water, create a stable foam and cleanse without excessive stripping, Sodium Oleth-7 Phosphate appears in face washes, micellar waters, shampoo, body washes, bubble baths, facial masks and lightweight moisturizers. It is also used in makeup removers and shaving creams where gentle yet effective soil removal is key.
Sodium Oleth-7 Phosphate’s Cosmetic Benefits/Uses
This multitasking ingredient supports several aspects of a formula’s performance
- Cleansing: Lifts away dirt, excess oil and makeup so skin and hair feel fresh and comfortable
- Foaming: Generates a creamy lather that helps spread the product evenly and gives a pleasant sensory feel
- Emulsifying: Keeps oil and water phases mixed, improving product stability and ensuring active ingredients are delivered uniformly
Who Can Use Sodium Oleth-7 Phosphate
Sodium Oleth-7 Phosphate is generally well tolerated by most skin types. Oily and combination skin tend to appreciate its effective yet mild cleansing action, while normal and sensitive skin often find it gentle enough for daily use. Those with very dry or compromised skin may notice a slight feeling of tightness if the formula is not balanced with extra conditioners, so pairing it with a hydrating moisturizer is advisable.
The ingredient is synthesized from plant based oleyl alcohol and does not rely on animal derived raw materials, making it suitable for vegans and vegetarians provided the finished product has not been tested on animals.
Current safety data indicates no specific concerns for people who are pregnant or breastfeeding. Still this is not medical advice and anyone expecting or nursing should review all personal care products with a healthcare professional to be certain they fit individual needs.
Sodium Oleth-7 Phosphate does not increase photosensitivity so it will not make skin more prone to sunburn. It also plays well with most other common cosmetic ingredients and does not interfere with sunscreen efficacy or color cosmetics.
Potential Side Effects/Adverse Reactions
Responses to topical Sodium Oleth-7 Phosphate vary from person to person. The effects listed below are possible rather than probable and most users experience none of them when the ingredient is used at appropriate levels in a well formulated product.
- Mild skin irritation such as redness or stinging
- Eye irritation if the product accidentally gets into the eyes
- Dryness or tightness, especially on very dry or eczema prone skin
- Allergic contact dermatitis in individuals sensitive to ethoxylated surfactants
- Scalp flaking when used in high foaming shampoos on already dry scalps
If any of these reactions occur stop using the product and seek advice from a qualified healthcare provider.
Comedogenic Rating
Rating: 1 / 5 Sodium Oleth-7 Phosphate is highly water soluble and designed to rinse away cleanly, which means it is unlikely to build up inside pores or form a film that traps sebum and debris. Its mild surfactant nature and low usage levels in finished products further reduce the chance of clogging. Suitable for acne-prone or breakout-prone skin in most cases. If a formula also contains heavy oils or waxes those co-ingredients, not this phosphate, are more likely to be the culprits behind congestion.
Summary
Sodium Oleth-7 Phosphate serves as a gentle cleanser, foam booster and emulsifier. Its structure features seven ethoxy units that attract water, while the oleyl chain grabs onto oils so it can lift dirt then rinse away without harshness. The phosphate group adds stability and boosts mildness, letting formulators create sulfate-free washes that still feel rich.
Although not as famous as sodium lauryl sulfate or coco-glucoside, this ingredient has carved out a niche in micellar waters, facial cleansers and baby shampoos where balanced cleansing is prized. Consumers who check labels may spot it more often as brands look for alternatives that clean effectively yet respect the skin barrier.
Current safety data shows low irritation potential and no major health concerns when used within recommended limits. As with any new skincare or haircare product, perform a quick patch test to be sure it agrees with your individual skin.