L-ascorbic acid is the pure, unmodified form of vitamin C, milled to an ultrafine particle size for easier dissolving. It's typically used in formulations as the most potent, directly active form of vitamin C.
How is it used?
Formulate at a low pH (around 2.5-3.0 for maximum stability, or 4-5 for a more practical skin-tolerable range), and consider stabilizing with ferulic acid or vitamin E; anhydrous or silicone-based formats also improve stability.
Forms
Available forms and grades affect how this ingredient behaves and how it should be selected for a formula.
Appearance
Color, texture, and physical characteristics can vary between suppliers and product grades.
Usage rate
Recommended incorporation levels depend on product type, supplier guidance, and the intended result.
Why we use it
Formulators choose this ingredient for specific performance, sensory, and stability benefits.
Strengths and limitations
Its advantages, compatibility considerations, and practical tradeoffs should be weighed during development.
Alternatives and substitutions
Possible replacements depend on the ingredient's role, desired skin feel, and formulation system.
Storage and shelf life
Appropriate storage conditions help protect quality and performance throughout the ingredient's usable life.
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