Maximum Percentage of Multiple Active Ingredients in a Formula

There is no fixed rule on the maximum total percentage of multiple active ingredients that can be included in a 100% formulation. The maximum amount depends on several factors, such as:

• Type of each Active Ingredient: Each active ingredient has different recommended usage levels. Some are effective at low concentrations, while others may require higher amounts.
• Compatibility of Active Ingredients: Some active ingredients may react with each other or be incompatible, which can reduce efficacy or cause issues.
• Purpose of the Formulation: The desired outcome of the formulation, such as anti-aging, moisturizing, or skin tone correction, will influence the selection and quantity of active ingredients.
• Stability of the Formulation: Including too high a percentage of active ingredients can affect the overall stability of the formulation.
• Safety and Irritation: Some active ingredients can cause irritation if used at excessively high concentrations.

Therefore, determining the total amount of active ingredients in a formulation must consider these factors together and should follow the raw material supplier's recommendations and cosmetic science principles.