Who is the glossary for?

Marketing and product teams at consumer health brands, regulatory consultants, and founders preparing for their first clinical study. Definitions are written for non-scientists but are technically accurate and reviewed by Citruslabs' clinical operations team.

How often is the glossary updated?

New terms are added monthly as the regulatory and clinical landscape shifts. Existing definitions are reviewed at least once per year to reflect updated FDA, FTC, and IRB guidance.

Can I suggest a term?

Yes. Email hello@citruslabs.com with a term you'd like added and a short note on the context where you'd like to see it defined.

Citruslabs Glossary

What is the Citruslabs Glossary? The Citruslabs Glossary is a free reference of plain-language definitions for terms used in clinical research, IRB review, regulatory marketing (FDA, FTC), and consumer health product claims. Definitions are written for marketing and product teams at consumer health brands but are technically reviewed by Citruslabs' clinical operations team. Updated monthly with new terms and reviewed annually for accuracy.

Your go-to glossary for everything from clinical trial terminology to CPG marketing lingo. Explore key terms, simplified.

Whether you are a supplement brand exploring your first clinical study, a skincare company navigating FTC compliance, or a pet health startup trying to understand biomarker endpoints, this glossary breaks down the language of clinical research and consumer health marketing into plain, practical definitions.

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Adverse Event: An adverse event is any unwanted occurrence that happens after a participant begins treatment in a clinical trial, regardless of whether it’s caused by the study treatment.
Advertising Standards: Advertising standards are official guidelines that ensure product claims are accurate, evidence-based, and not misleading to consumers.
Biomarker: A biomarker is a measurable biological indicator, such as a molecule, gene, or physical characteristic, that reflects a normal process, a disease state, or a response to a product or treatment. In clinical research, biomarkers give researchers objective, quantifiable data to track alongside participant-reported outcomes.
Biotech Clinical Trials: Biotech clinical trials are the multi-phase studies biotechnology and pharmaceutical companies run to test whether a new drug, biologic, or therapy is safe and effective enough to earn FDA approval. These trials follow a strict, highly regulated path that looks quite different from the consumer research used to support claims on supplements, skincare, and other CPG products.
Brand Loyalty: Brand loyalty is a customer's consistent preference for one brand over its competitors, reflected in repeat purchases even when comparable or cheaper alternatives are available. For supplement, skincare, and CPG brands, loyalty is often built on trust, and trust is easier to earn when a brand can back up what it claims about its products.
Brand Perception: Brand perception is the collection of beliefs, impressions, and feelings customers hold about a brand based on their direct experiences, marketing exposure, and word of mouth. Unlike brand identity, which is what a company projects, brand perception is what customers actually believe, and the two don't always match.
CPG Advertising: CPG advertising is the paid promotion of consumer packaged goods across digital, retail, and traditional media channels, aimed at driving awareness, trial, and repeat purchase. It overlaps heavily with the broader discipline of CPG marketing, but refers specifically to the paid media placements and campaigns a brand runs, whether that's a social ad, a streaming commercial, or an in-store display.
CPG Market Research: CPG market research is the process of gathering and analyzing data about consumers, competitors, and product performance to guide decisions for consumer packaged goods brands. Unlike general market research, CPG-specific research often centers on how real people interact with a physical product, from taste and texture to packaging and perceived efficacy, making hands-on testing methods a core part of the process.
CPG Marketing: CPG marketing refers to the strategies consumer packaged goods brands use to build awareness and win repeat purchases across retail, e-commerce, and direct-to-consumer channels. CPG stands for consumer packaged goods, a category covering everyday products like food and beverage, supplements, skincare, and household items that customers buy frequently and replace often.
Causation: Causation is the relationship between two events where one directly produces the other. In clinical research, proving causation, not just noticing a pattern, is what separates a real product effect from a coincidence and grounds every credible health claim a brand makes.
Clinical Researchers: Clinical researchers are the scientists and trained professionals who design, conduct, and oversee studies that test how a product, treatment, or intervention affects human participants. In consumer health and CPG research, clinical researchers are the people responsible for translating a brand's claim idea into a properly executed study that produces evidence a brand can actually stand behind.
Clinical Trials: A clinical trial is a research study that tests how a product, treatment, or intervention affects people, used to determine whether it's safe and whether it actually works. For supplement, skincare, and wellness brands, a well-run clinical trial is the difference between a marketing claim and a backed-up one.
ClinicalTrials.gov: ClinicalTrials.gov is a federally run database, maintained by the National Library of Medicine, where researchers register clinical studies and, in many cases, post their results for public access. For biotech, pharmaceutical, and some consumer health brands running clinical research, registering a study on ClinicalTrials.gov isn't optional bureaucracy, it's often a legal requirement tied directly to the study's design and funding source.
Consumer Perception Study: A consumer perception study captures how real users experience a product, measuring subjective impressions like texture, scent, ease of use, and perceived results rather than objective clinical outcomes. For consumer health and beauty brands, this kind of study fills a gap that clinical measurement alone can't address: whether people actually like using the product enough to repurchase it.
Crossover Study: A crossover study is a clinical trial design in which each participant receives two or more interventions in sequence, rather than being permanently assigned to a single treatment or control group. Because every participant eventually experiences every condition being tested, a crossover study allows each person to serve as their own control, which can make the design more statistically efficient than a traditional parallel-group trial.
Double Blind Study: A double-blind study is a clinical trial design in which neither the participants nor the researchers administering the treatment know who is receiving the actual product versus a placebo or comparison. This design is one of the most trusted tools in clinical research for producing results that hold up to scrutiny.
Expectation Bias: Expectation bias, also called expectancy bias, occurs when a researcher's or participant's prior beliefs about what a study should find influence how they interpret or report results, independent of what actually happened. It's one of the more subtle but consequential sources of bias in research, since it can distort outcomes without anyone involved intending to skew the data.
FDA Approval: FDA approval is the U.S. Food and Drug Administration's formal determination that a product's benefits outweigh its known risks for a specific, intended use, based on evidence submitted by the manufacturer. The term gets used loosely across consumer health marketing, but it has a precise legal meaning, and most supplements, skincare products, and CPG items don't carry it, even when a brand's language implies otherwise.
FDA Compliance: FDA compliance refers to the ongoing process of meeting the U.S. Food and Drug Administration's requirements for how a product is manufactured, labeled, tested, and marketed. Unlike FDA approval, which applies to specific product categories that require formal clearance, FDA compliance is a continuous obligation that applies to nearly every consumer health, supplement, food, and cosmetic brand selling in the United States.
FDA Nutrition Guidelines: FDA nutrition guidelines are the set of federal regulations that govern how food and supplement manufacturers must present nutritional information, including Nutrition Facts labels, serving sizes, and daily value percentages. For consumer health and CPG brands, these guidelines aren't optional style preferences, they're binding requirements that determine what a product's packaging must say and how it must say it.
FTC Compliance: FTC compliance refers to meeting the Federal Trade Commission's requirements for truthful, substantiated advertising and marketing, particularly the rule that any claim made about a product must be backed by competent and reliable evidence. For consumer health and CPG brands, FTC compliance sits alongside FDA compliance as one of the two major regulatory frameworks shaping what a brand can say about its products and how it has to prove it.
Focus Group: A focus group is a small group discussion, guided by a moderator, used to gather in-depth, qualitative feedback on a product, concept, or experience. For consumer health and CPG brands, a focus group is one of the fastest ways to hear how real people talk, think, and feel about a formula before it ever reaches a larger clinical study.
Health Claims: A health claim is a specific, regulated statement that characterizes a relationship between a food, dietary ingredient, or supplement and a reduced risk of a disease or health-related condition. Health claims are one of the most tightly regulated categories of label and marketing language a consumer health brand can use, and using one incorrectly, or using language that resembles one without meeting the requirements, is a common source of regulatory risk.
In Silico Testing: In silico testing uses computer models and simulations to predict how an ingredient or product will behave, offering a faster, lower-cost alternative or complement to physical lab and animal testing. In consumer health and cosmetics research, in silico testing is increasingly used as an early screening step before a product moves into more resource-intensive testing phases.
Inclusion Criteria: Inclusion criteria are the specific characteristics a person must have to be eligible to participate in a clinical trial or research study, such as age range, health status, or prior use of a particular product. Alongside exclusion criteria, which define who cannot participate, inclusion criteria determine the exact population a study is designed to represent, which in turn shapes how broadly its results can be applied.
Marketing Claims: Marketing claims are the promotional statements a brand makes about its products, ingredients, or business in advertising, packaging, and content, covering everything from performance benefits to sustainability commitments. While the term overlaps heavily with product claims, marketing claims is the broader category, encompassing any promotional statement a brand puts into the world, whether or not it's tied to a specific product attribute.
Misleading Claims: Misleading claims are statements in advertising or on packaging that create a false or deceptive overall impression, even when individual words in the claim are technically accurate. Regulators evaluate a claim by the net impression it leaves on a reasonable consumer, not just its literal wording, which is why avoiding misleading claims requires more than fact-checking each sentence in isolation.
Patient Recruitment: Patient recruitment is the process of identifying, screening, and enrolling qualified participants in a clinical trial or research study. It's frequently one of the most time-consuming and unpredictable parts of running a study, and delays in recruitment are among the most common reasons a clinical trial timeline slips.
Peer Reviewed Journals: Peer-reviewed journals are academic and scientific publications that require independent experts in the field to evaluate a study's methodology, data, and conclusions before it's accepted for publication. For consumer health brands, publication in a peer-reviewed journal is one of the strongest signals available that a study's findings can be trusted and used to support a product claim.
Phases of Clinical Trials: The phases of clinical trials refer to the sequential stages, typically numbered Phase I through Phase IV, that a drug or medical product moves through on its way to regulatory approval and beyond. While this structure was built for pharmaceutical development, understanding it helps explain why clinical research for supplements, skincare, and CPG products looks meaningfully different in scope and timeline.
Principal Investigator: A principal investigator, often shortened to PI, is the person responsible for leading a clinical trial, from designing the study protocol to overseeing participant safety and ensuring the research is conducted ethically and accurately. Every clinical trial needs one, and the quality of a study often traces directly back to the strength of its PI.
Product Claims: Product claims are the specific statements a brand makes about what its product does, contains, or is capable of delivering, whether that's a performance benefit, an ingredient fact, or a comparison to another product. Every product claim, no matter how small it sounds, creates an expectation with the consumer that the brand needs to be able to back up with evidence if it's ever questioned.
Product Marketing: Product marketing is the discipline of positioning a product, communicating its value, and driving demand among the customers most likely to buy it. For supplement, skincare, and CPG brands, product marketing carries an added layer of responsibility: the claims used to position a product have to be backed by real evidence, not just persuasive language.
Product Quality Assurance: Product quality assurance is the process of systematically verifying that a manufactured product consistently meets its safety, potency, and label specifications from batch to batch. In consumer health and CPG manufacturing, product quality assurance is the discipline that ensures the product a customer actually receives matches what was tested, formulated, and promised on the label.
Product Testing Methods: Product testing methods are the range of approaches brands use to evaluate a product's safety, quality, and performance before it launches and after it's on the market. The right method depends on what a brand needs to learn, whether that's basic stability under different conditions, ingredient-level safety, or how real consumers experience the finished product, and most brands rely on a combination of methods rather than a single test.
Publishing Clinical Trials: Publishing clinical trials refers to the process of making a study's protocol, methodology, and results publicly available, typically through a peer-reviewed journal, a study registry, or both. For consumer health and biotech brands, publishing a clinical trial is often the step that turns internal research into evidence the public, regulators, and industry peers can actually verify and rely on.
Randomized Controlled Trial: A randomized controlled trial, often abbreviated RCT, is a study design in which participants are randomly assigned to either a treatment group or a control group, allowing researchers to measure a product's true effect while minimizing bias. It's widely considered the most rigorous method available for establishing whether a product actually causes the outcomes a brand wants to claim.
Recall Bias: Recall bias is a type of systematic error that occurs when study participants inaccurately remember or report past events, exposures, or experiences, often in ways that differ between groups being compared. It's one of the most common threats to data quality in studies that rely on self-reported history rather than real-time observation.
Regulatory Compliance: Regulatory compliance means operating within the laws, standards, and guidelines set by the government agencies and industry bodies that oversee your product category. For supplement, skincare, and CPG brands, regulatory compliance covers everything from how a product is manufactured to what a brand is allowed to claim about it.
Retail Marketing: Retail marketing is the set of strategies a brand uses to promote and sell its products through retail channels, whether that's a physical store, an e-commerce marketplace, or a retailer's own website. For supplement, skincare, and CPG brands, retail marketing carries an added requirement: retailers increasingly expect the claims behind a product to hold up before they'll commit shelf space or promotional support to it.
Retrospective Studies: A retrospective study is a type of research design that looks backward at existing data or records to analyze outcomes that have already occurred, rather than collecting new data as events unfold. This backward-looking approach makes retrospective studies faster and less expensive to run than studies that follow participants forward in time, though it also introduces certain limitations that researchers need to account for.
Risk Analysis: Risk analysis is the process of identifying potential risks and weighing them against expected benefits before a decision is made or an action is taken. In clinical research, risk analysis is what determines whether a study is safe enough to run, and it's a required step before any trial involving human participants can move forward.
Science-Backed Claims: Science-backed claims are marketing or label statements supported by credible research, such as a clinical trial, published study, or other rigorous testing, rather than assumption, tradition, or ingredient reputation alone. As more consumer health and beauty brands lean on the phrase "science-backed" to differentiate their products, the term only carries real weight when there's actual research behind it.
Science-Backed Marketing: Science-backed marketing is an overall marketing approach that builds a brand's messaging, positioning, and claims around documented research rather than assumption, trend-chasing, or unverified ingredient hype. Rather than describing a single statement, science-backed marketing describes a strategy: using real evidence as the foundation for how a brand talks about its products across every channel.
Single-Arm Trial: A single-arm trial is a study design in which every participant receives the same intervention, with no separate control or placebo group for comparison. This design is faster and simpler to run than a randomized controlled trial, but it also makes it harder to prove that any observed change was actually caused by the product being tested.
Skin-Grading: Skin grading is a standardized method trained evaluators use to visually assess and score specific skin conditions, such as redness, wrinkling, or pigmentation, according to a defined scale. In skincare clinical research, skin grading gives brands an objective, repeatable way to document visible changes that goes beyond a participant's own impression of how their skin looks or feels.
Skincare Clinical Trials: Skincare clinical trials are structured studies that measure how a skincare formula actually performs on human skin, generating the evidence a brand needs before making a specific claim about a product's effects. Unlike general marketing language about how a product should work, a skincare clinical trial produces measurable, documented results that can support a claim if it's ever questioned.
Skincare Product Development: Skincare product development is the process a brand follows to formulate, test, and refine a new skincare product from initial concept through to a market-ready launch. Getting this process right means balancing formulation science, regulatory requirements, and the testing needed to back up whatever claims the brand plans to make once the product hits shelves.
Study Design: Study design is the overall plan and structure a researcher uses to answer a specific research question, including how participants are selected, how data is collected, and how variables are compared. The study design chosen for a clinical trial shapes everything downstream, from what conclusions can be drawn to how much weight the results will carry with regulators, retailers, and customers.
Study Protocol: A study protocol is the detailed written document that governs exactly how a clinical trial or research study will be conducted, covering everything from eligibility criteria to data collection procedures and statistical analysis plans. It functions as the operating manual for a study, ensuring that everyone involved, from the principal investigator to the data analysts, follows the same consistent process from start to finish.
Study Results: Study results are the measured outcomes a research study produces once data collection and analysis are complete, showing whether a tested product, ingredient, or intervention had the effect researchers set out to measure. For consumer health and beauty brands, study results are the raw material behind every evidence-based marketing claim, but turning results into a claim responsibly requires understanding what those results actually show and how confidently they can be generalized.
Supplement Claims: Supplement claims are the statements a brand makes on a label, in advertising, or in marketing materials about what a dietary supplement does, whether that's supporting a bodily function, providing a nutrient, or affecting a specific health outcome. Because supplements sit in a regulatory category distinct from drugs, the type of claim a brand makes determines which rules apply and what evidence is required to back it up.
Supplement Efficacy Studies: Supplement efficacy studies are research studies designed specifically to measure whether a dietary supplement produces its intended benefit in the people who take it. Rather than testing basic safety alone, an efficacy study asks a more targeted question: does this specific formula, at this specific dose, actually do what the brand wants to say it does.
Supplement Formulation: Supplement formulation is the process of determining a dietary supplement's ingredients, dosages, delivery format, and manufacturing specifications before it goes into production. It's the foundation on which everything else about a supplement rests, since the choices made during formulation directly determine whether a product can plausibly deliver the benefits a brand eventually wants to claim.

Frequently Asked Questions

What is the Citruslabs Glossary?: The Citruslabs Glossary is a free reference of plain-language definitions for terms used in clinical research, regulatory marketing, and consumer health product claims — covering everything from IRB and biomarker to FTC substantiation and substantiation file.
Who is the glossary for?: Marketing and product teams at consumer health brands, regulatory consultants, and founders preparing for their first clinical study. Definitions are written for non-scientists but are technically accurate and reviewed by Citruslabs' clinical operations team.
How often is the glossary updated?: New terms are added monthly as the regulatory and clinical landscape shifts. Existing definitions are reviewed at least once per year to reflect updated FDA, FTC, and IRB guidance.
Can I suggest a term?: Yes. Email hello@citruslabs.com with a term you'd like added and a short note on the context where you'd like to see it defined.