
What is ‘Efficacy %’?
When formulating a skincare product, active ingredients suppliers will give us a tested 'efficacy' percentage range. I.e. the % level to get the desired results. E.g. 2-5% for Niacinamide = x% increase in brightening.

We are The Efficacy % Skincare Company.™
Our Mission: To challenge confusion and Claimwashing ™ within the beauty industry by bringing our community minimalist, effective and easy-to-understand formulas.
Our key ingredients are always at tested efficacy %, given to us by the best ingredient manufacturers (used by all of your favourite big names in beauty).
As industry insiders, this is how we formulate behind the scenes. And now, we want to share this straightforward approach to ingredients and claims with the consumer.
FAQs
How is efficacy % determined?
This percentage is typically determined through clinical or in vitro testing, showing how well an ingredient performs in improving skin concerns.
To what extent does an ingredient work below efficacy %?
The effectiveness of an active ingredient used below the supplier’s recommended level is uncertain. Claims are based on testing at specific concentrations and using it at a lower concentration may result in little to no efficacy, with effects that may not be noticeable to consumers.
It’s worth noting, a well-designed formula with an advanced delivery system or technology could enhance the ingredient’s performance, even at a lower concentration. From a consumer POV this can often be a bit vague and confusing however, lacking the immediate, verifiable appeal of tested ingredient percentages.
How do I tell if my favourite brand's ingredients are at efficacy %?
Definitely drop them a message! We created KEATS to empower our community, so that you can get the most from your skincare. We recommend reaching out to customer services to ask for %s of key ingredients. You can also ask the brand for the recommended efficacy %s.