Moisturizing, Brightening, Anti Acne: How Do You Actually Prove These Claims?
On any skincare shelf, claims like “48 hour hydration”, “visibly brighter in 7 days”, or “proven to reduce acne” have become entirely familiar. These claims are not merely attention grabbing marketing strategies for increasingly discerning consumers, they are promises that must be provable.
And for manufacturers operating under increasingly stringent BPOM oversight, promises without scientific evidence are a very real business risk. In an increasingly competitive skincare industry, claims such as moisturizing, brightening, or anti aging are no longer sufficient when simply displayed on packaging.
Consumers are more critical, regulators are stricter, and the market demands clear scientific evidence. This is where the role of laboratory testing becomes crucial not merely a formality, but as the foundation of product credibility. So what exactly are the scientific methods for proving each claim printed on your cosmetic product?
Table of content :
- What Is Efficacy Testing and Why Is It Mandatory?
- Proving a Moisturizing Claim: Methods and Instruments
- Proving a Brightening Claim: From Melanin to Colorimetry
- Proving an Anti Acne Claim: Microbiology and Clinical Testing
- In Vitro vs In Vivo: Choosing the Right Method
What Is Efficacy Testing and Why Is It Mandatory?
Efficacy testing is a scientific process for evaluating the effectiveness of a cosmetic product in delivering specific benefits, such as moisturizing, brightening, or reducing wrinkles. This testing is conducted through laboratory methods and clinical trials to prove that the product genuinely works as claimed.
In Indonesia, the regulatory foundation is unambiguous. Cosmetic claims must be substantiated with relevant supporting data within the scope of cosmetics, or backed by testing using valid, up to date methodologies that comply with applicable ethical standards including claims that state a function with a specific efficacy timeframe such as “brightening in 7 days” or “24/7 protection,” as well as claims related to dermatologist testing.
The consequences of non compliance are real: efficacy testing helps brands avoid inaccurate claims and prevent potential legal issues or reputational damage, while simultaneously building consumer loyalty through a demonstrated commitment to transparency and quality.
Proving a Moisturizing Claim: Methods and Instruments
Moisturizing claims are among the most common and also the most straightforwardly verifiable scientifically. Efficacy test parameters for moisturizing claims include measuring skin moisture levels using standardized non invasive instruments. The primary instrument used is the corneometer a device that objectively measures water content in the stratum corneum before and after product application on a volunteer panel.
This instrumental method uses tools such as the corneometer to quantitatively measure skin moisture, combined with subjective surveys that capture participant responses and experiences to assess their satisfaction with the product. For claims with specific durations such as “moisturizes for 24 hours”, measurements are taken at multiple time points after a single application to confirm that the effect persists for the claimed duration.
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Proving a Brightening Claim: From Melanin to Colorimetry
Brightening claims require a more complex testing approach, as they involve gradual changes in skin pigmentation. Efficacy test parameters for brightening claims include measuring skin luminosity and pigmentation reduction using standardized methods. Instrumentally, testing is conducted using a colorimeter or spectrophotometer that objectively measures skin brightness values before and after a product use period.
For claims with specific timeframes such as “brightening in 7 days” the test protocol must include well documented periodic measurements throughout that period. Benefit claims printed on packaging such as “brightening” or “reducing wrinkles” must be supported by valid scientific evidence both through literature studies and clinical trials.
Various randomized controlled trials have been published in dermatology journals evaluating the effectiveness of active ingredients such as retinoids, vitamin C, and hyaluronic acid in improving skin health.
Proving an Anti Acne Claim: Microbiology and Clinical Testing
Anti acne claims carry their own complexity, as they involve the product's interaction with acne causing microorganisms on the skin. The agar disk diffusion method is one microbiological test used to evaluate the validity of anti acne claims in skincare products. Product samples or their active ingredients are placed on a disc that is then positioned on agar media inoculated with acne causing bacteria such as Cutibacterium acnes.
After incubation, an inhibition zone forming around the disc indicates the product's antibacterial activity. As a complement, the dilution method is used as a quantitative technique to determine the Minimum Inhibitory Concentration (MIC) the lowest concentration of an antimicrobial agent capable of inhibiting microbial growth through broth dilution or agar dilution methods.
For stronger claims, clinical trials on volunteers with acne prone skin provide far more comprehensive in vivo data that is more persuasive from a regulatory standpoint.
In Vitro vs In Vivo: Choosing the Right Method
In the context of cosmetic efficacy testing, the choice between in vitro and in vivo methods depends greatly on the type of claim and the purpose of testing. Skincare product efficacy testing can be conducted through in vitro studies using cell cultures or artificial media in the laboratory or in vivo studies conducted in intact organisms such as animals or humans.
Typically, skincare product efficacy testing is performed in vivo on volunteers using non invasive instruments. In vitro testing serves as an efficient and cost effective preliminary screening providing early indications of active ingredient efficacy before proceeding to more comprehensive clinical testing. In vivo testing, meanwhile, delivers the most clinically relevant data and the strongest supporting evidence for BPOM notification.
A combination of irritation and efficacy testing provides a comprehensive picture of a skincare product's quality a product that is effective but causes irritation cannot be considered ideal, and neither can the reverse.
Your Product Claims Not Yet Tested? Validate Their Efficacy with IML!
Are the “moisturizing”, “brightening”, or “anti acne” claims on your cosmetic product backed by valid, standardized efficacy test data that can serve as official supporting documentation for BPOM notification? Whether you are a brand owner launching a new product or an experienced manufacturer looking to strengthen claims with up to date scientific data.
IML Testing & Research provides comprehensive efficacy testing services covering moisture testing, skin brightness assessment, anti acne testing, and a full range of cosmetic claim testing using both in vitro and in vivo methods to international standards. Consult your cosmetic efficacy testing needs today and ensure every claim you make can truly be scientifically justified.
Author & Editor: Alphi
References
BPOM Regulation No. 3 of 2022 on Technical Requirements for Cosmetic Claims.
BPOM Regulation No. 18 of 2024 on Cosmetic Labeling, Promotion, and Advertising.
IML Testing & Research. (2026). Why Irritation and Efficacy Testing for Skincare Products Cannot Be Overlooked. imlresearch.com
IML Testing & Research. (2026). Anti-Acne Claims in Skincare: Is Microbiological Testing Necessary? imlresearch.com
LABCOS. The Importance of Efficacy Testing in Cosmetic Products. labcos.id
Draelos, Z.D. (2011). Cosmetic Efficacy Testing. Journal of Cosmetic Dermatology, 10(4), 303–306.
