Combining Plant Extracts in a Face Cream Formula

When formulating a face cream, the total percentage of plant extracts you can include depends on the specific extracts used and their recommended usage rates. There isn't a single universal maximum percentage for the combined total of all extracts.

Based on the typical usage rates for the extracts you mentioned:

• Cucumber Extract: Recommended usage is typically 3-5%.
• Aloe Vera Extract: Recommended usage is typically 1-10%.
• Licorice Extract: The recommended usage varies depending on the type. For example, Licorice Extract (Licochalcone A 1%) is typically used at 0.5-3%, while Licorice Extract (Glabridin 4.5%) is typically used at 1-2%.

As a general guideline for a face cream formula, the total combined percentage of multiple extracts often falls within the range of 5% to 10%. In some cases, depending on the specific extracts and the desired effect, this total could potentially go up to 15%.

Using a total combined percentage significantly higher than this range might affect the stability of your cream formula or increase the risk of skin irritation. It's always recommended to start with lower percentages when combining multiple extracts and perform stability and skin compatibility tests.