Snapshot
- Overview
- A stable vitamin C form that brightens and evens out skin tone.
- Category
- Antioxidant, Brightening, Acne, Hyperpigmentation, Tone/Texture
- Type
- Antioxidant
Stay-C 50
Stay-C 50 is sodium ascorbyl phosphate, a stable, water-soluble vitamin C derivative for cosmetic use. It's used for antioxidant support and to refine the look of uneven tone and texture, with results dependent on concentration and formula.
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Our take
Is Stay-C 50 a Good Ingredient?
It rates Good because sodium ascorbyl phosphate is a stable, water-soluble vitamin C derivative with peer-reviewed support for antioxidant effects and modest brightening and clarifying benefits when used at effective levels, and it's gentler than L-ascorbic acid, though not quite as potent.
What it does
Skin Benefits
It helps defend against environmental stressors while promoting a brighter, more even-looking complexion, and can support clearer-looking skin and a smoother appearance over time when well formulated.
Where you'll find it
Uses in Skincare & Cosmetics
It's often included in water-based serums, toners, gel moisturizers, and gentle cleansers targeting dullness and uneven tone.
Before you use it
Safety
It's generally well tolerated with a lower sting risk than pure vitamin C due to higher formulation pH. Mild irritation is still possible in sensitive skin, so patch test if unsure. No widely recognized cosmetic-use restrictions apply.