Published August 27, 2026 by the Ecommerce Review Hub Editorial Team
Consumer-product pages often use technical language that can make simple buying decisions feel more complicated than they need to be. This glossary explains common ingredient, certification, testing, formulation, safety and marketing terms in plain English. The goal is to help readers interpret claims consistently across skincare, supplements, beauty, household products, kids’ technology and other consumer categories.
Ingredients and Formulation
Active Ingredient
An ingredient intended to produce a specific functional effect. In regulated categories, “active ingredient” may have a formal legal meaning; in ordinary marketing, brands sometimes use the phrase more loosely.
Inactive Ingredient
An ingredient included for functions such as texture, preservation, color, stability, delivery or taste rather than the product’s primary intended effect.
Proprietary Blend
A combination of ingredients disclosed under a collective name, sometimes without listing the exact amount of each component. Proprietary blends can make dose comparison more difficult.
Concentration
The amount of a particular ingredient present in a formula. A familiar ingredient name does not necessarily imply that the product contains a clinically meaningful amount.
Standardized Extract
A botanical extract manufactured to contain a specified amount of one or more marker compounds. Standardization improves consistency but does not automatically prove effectiveness.
Fragrance-Free
A claim generally indicating that fragrance ingredients were not intentionally added for scent. It is not identical to “unscented,” which may still involve ingredients used to mask odor.
Hypoallergenic
A marketing term suggesting a product is formulated to reduce the likelihood of allergic reactions. The term does not guarantee that no user will react.
Testing and Quality
Third-Party Testing
Testing performed by an organization separate from the brand or manufacturer. The value of the claim depends on what was tested, which methods were used and whether results are independently accessible.
Certificate of Analysis (COA)
A document reporting test results for a batch or lot. A useful COA identifies the product or lot, laboratory, methods and specifications tested.
Good Manufacturing Practices (GMP)
Manufacturing requirements or standards designed to support consistent production and quality control. GMP compliance is a manufacturing baseline, not proof of clinical effectiveness.
Batch or Lot Number
An identifier linking a product to a specific production run. Lot traceability can help with testing, recalls and quality investigations.
Stability Testing
Testing used to evaluate how product quality changes over time under defined storage conditions.
Certifications and Standards
USDA Organic
A U.S. certification framework for qualifying agricultural products produced according to specified organic standards. Organic certification does not establish that a finished product is more effective.
NSF Certification
Certification programs operated by NSF for specified product categories and standards. The exact meaning depends on the certification program and scope.
USP Verified
A verification program from the U.S. Pharmacopeia for qualifying products that meet specified identity, strength, purity and manufacturing criteria.
Cruelty-Free
A claim generally related to animal testing. Definitions and certification standards differ, so readers should check the specific program or policy behind the label.
Vegan
A product claim indicating that the formula does not contain intentionally added animal-derived ingredients under the brand’s stated standard. Vegan does not automatically mean cruelty-free, hypoallergenic or more sustainable.
Dermatologist-Tested
A claim indicating that a dermatologist participated in or supervised some form of testing. The phrase alone does not explain the study design, sample size or outcome.
Clinically Tested
A broad marketing phrase indicating that some type of human testing occurred. Readers should look for the study design, number of participants, duration, control group, endpoints and funding source.
Claims and Evidence
Clinically Proven
A stronger claim than “clinically tested,” implying evidence supports a specific outcome. The quality of that evidence still depends on the underlying study.
Evidence-Based
A phrase suggesting decisions or claims are informed by research. It does not identify the quality or directness of the evidence unless the source is provided.
Structure/Function Claim
In the U.S. dietary-supplement context, a claim about supporting normal body structure or function rather than diagnosing, treating, curing or preventing disease.
Disease Claim
A claim that a product diagnoses, treats, cures, mitigates or prevents a disease. Regulatory rules for disease claims differ materially from general wellness claims.
Before-and-After Evidence
Photos or testimonials showing an apparent change over time. These can illustrate individual experiences but do not establish typical results without stronger study controls.
Safety and Labeling
Patch Test
Applying a small amount of a topical product to a limited area before broader use to check for irritation or sensitivity.
Contraindication
A circumstance in which a product, ingredient or treatment should not be used or should be used only with professional guidance.
Drug Interaction
A situation in which one substance changes the effect of a medication or another substance. Supplements can interact with prescription and over-the-counter medicines.
Recall
A process for removing or correcting a product because of safety, quality, labeling or regulatory concerns.
Pricing and Buying Terms
Unit Price
The cost per standardized amount, such as per ounce, milliliter, serving or item. Unit price is useful for comparing differently sized packages.
Subscription Discount
A reduced price offered in exchange for recurring orders. Buyers should check renewal frequency, cancellation terms and whether the discount changes over time.
Money-Back Guarantee
A refund policy subject to specified conditions. The useful details are the time window, return requirements, excluded products and whether shipping is refundable.
How to Use This Glossary
When a product relies heavily on certifications or technical claims, look beyond the label and verify the underlying standard, test or study. Two brands may both say “clinically tested” or “third-party tested” while providing very different levels of evidence. Use this glossary together with the site’s How We Review page and About Ecommerce Review Hub page when comparing products.