Sodium Carbonate

Sodium carbonate, also known as washing soda or soda ash, is a salt of carbonic acid. In cosmetics, it is primarily used as a pH adjuster to increase the alkalinity of a product. It can also function as a cleansing agent, helping to remove dirt and oil.

BenefitNone 0 / 4

RiskModerate 1.8 / 4

Irritation i1.8 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Sensitization i0.5 / 4

Risk of allergic contact dermatitis or immune-based reactions. Fragrance allergens, preservatives, botanicals, and some dyes may score here.

Systemic exposure i0.1 / 4

Whether it has meaningful potential to be absorbed into the body at levels that may matter biologically. Most cosmetic ingredients score low unless there is known concern or high exposure.

Rated by SpottyLabs' ingredient methodology, independent of brands.

Things to watch

• skin irritation
• dryness

Products with Sodium Carbonate

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Frequently asked questions

Is sodium carbonate safe for use on skin?

Sodium carbonate is highly alkaline and can be irritating to the skin, especially at higher concentrations or with prolonged contact. It is generally not recommended for direct skin application in leave-on products.