Glossary · Formulation
What Is Active Ingredient?
An active ingredient is a component included for a specific functional effect on skin or hair rather than for texture, stability or preservation — for example retinol, niacinamide, vitamin C or salicylic acid. Its effect depends on concentration, the delivery system and whether the formula keeps it stable.
Why it matters when you source
Active concentration is where marketing claims and formulation reality most often diverge, and where stability work is genuinely tested. Ask what percentage is used, in what form, and what stability data supports the shelf life claimed on the label.
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