Ingredient guide
Disodium Phosphate
INCI name · disodium phosphate
In short
A buffering salt that keeps a product’s pH stable over time. This helps maintain the performance of pH‑sensitive ingredients such as vitamin C or exfoliating acids.
Best used
Anytime
What it is
Inorganic phosphate salt used as a buffering agent and pH stabiliser. Keeps product pH within a narrow range over time, which is especially important for formulas containing pH-sensitive actives like vitamin C or acids.
Evidence receipt
No linked study yet
No verified study is linked to this exact ingredient and route. The guidance below describes conventional use; it is not evidence of efficacy.
Also found as
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Common questions
What does Disodium Phosphate do in skincare?
It acts as a pH stabiliser, ensuring the product stays within its intended acidity range to maintain texture and ingredient stability.
Is Disodium Phosphate safe for skin?
Yes. It is widely used and generally well tolerated because it functions mainly within the formula rather than on the skin surface.
Why is pH stability important?
Stable pH helps keep products consistent and supports the effectiveness of ingredients that can degrade when pH drifts.
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