Health Claims vs Structure-Function Claims: What’s the Difference?

This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before making health decisions based on this content.

By HollyHerman.com Editorial Team | Last verified: August 2026

The Question: What's Really the Difference Between These Label Claims?

When you read a food or supplement label, you may see statements about disease prevention, general wellness, or nutrient function. But not all of these statements carry the same regulatory weight or scientific evidence behind them. This article explains the FDA's distinction between “health claims” and “structure-function claims,” why the difference matters, and what scientific evidence actually supports each category.

The Mechanism: How the FDA Classifies Label Statements

Health Claims: Disease-Risk Reduction Language

A health claim is a statement that explicitly connects a food, food component, or dietary supplement to a reduced risk of disease or health-related condition. Examples include “oat bran may help reduce cholesterol, which is associated with a lower risk of heart disease” or “adequate calcium intake supports bone health and may reduce osteoporosis risk.” These claims directly reference disease or serious health conditions.

For a health claim to appear on a label in the United States, it must first receive FDA pre-approval. The FDA requires Significant Scientific Agreement (SSA) among reputable scientists that the claim is based on publicly available, high-quality evidence. This is a rigorous standard—essentially, the evidence must be strong, consistent, and documented in peer-reviewed scientific literature before manufacturers can use it on packaging.

Structure-Function Claims: Normal Body Function Language

A structure-function claim describes how a nutrient or dietary ingredient supports the normal structure or function of the human body. Examples include “supports bone strength,” “promotes healthy digestion,” “enhances immune system function,” or “supports mental clarity.” These claims do not mention disease, diagnosis, treatment, cure, or prevention.

Structure-function claims do not require FDA pre-approval before appearing on a label. Instead, manufacturers must notify the FDA within 30 days of first marketing a product with a structure-function claim, but the FDA does not evaluate or approve the claim beforehand. This creates a lower barrier to entry and means the scientific evidence behind structure-function claims varies widely—from robust research to minimal supporting data.

The Critical Distinction

The key difference is disease reference. If a label statement mentions disease, disease risk, diagnosis, or prevention, it's a health claim and requires pre-approval. If it describes general wellness, nutrient function, or body structure support without disease language, it's typically a structure-function claim with no pre-approval requirement. This distinction affects both how strictly the claim is vetted and how consumers should interpret its reliability.

Current Evidence: How These Claim Types Are Regulated

Health Claims: The Significant Scientific Agreement Standard

The FDA has approved approximately 12–14 authorized health claims for foods and dietary supplements since the Dietary Supplement Health and Education Act (DSHEA) was enacted in 1994. Examples include claims linking:

• Soluble fiber (oats, barley) and reduced risk of heart disease
• Calcium and dairy and reduced osteoporosis risk
• Folate and reduced neural tube birth defect risk
• Omega-3 fatty acids and reduced coronary heart disease risk

Each approved health claim undergoes rigorous FDA evaluation, typically involving dozens to hundreds of peer-reviewed studies, meta-analyses, and systematic reviews. The FDA publishes its scientific findings publicly, and manufacturers must adhere to specific wording on labels.

Qualified Health Claims: The Middle Ground

A qualified health claim is supported by credible scientific evidence but does not meet the SSA standard for full FDA authorization. These claims must include qualifying language such as “limited scientific evidence suggests…” or disclaimer text that clarifies the strength of evidence. Examples include certain claims about pomegranate juice, green tea, and cognitive function. Qualified health claims require FDA notification but not pre-approval.

Structure-Function Claims: Minimal Pre-Market Oversight

Structure-function claims are filed with the FDA after marketing begins, not before. Manufacturers self-regulate the evidence supporting these claims, and the FDA only intervenes if it identifies false or misleading language. This means many structure-function claims have minimal or preliminary evidence supporting them. Research has shown that manufacturer-funded studies are more likely to produce favorable results than independent studies, which represents a significant bias concern.

Evidence Table: Regulatory Approval Requirements and Evidence Standards

Practical Implications for Consumers and Patients

What Health Claims Tell You

An authorized health claim on a label signals that the FDA has reviewed extensive scientific evidence and determined there is significant scientific agreement supporting the link between that nutrient and disease-risk reduction. This does not mean the nutrient cures or treats disease—only that it may reduce the risk when consumed as part of a healthy diet. Examples: eating oatmeal won't reverse heart disease, but regular soluble fiber consumption may modestly lower cholesterol.

Takeaway: Authorized health claims represent the highest level of FDA-vetted evidence for food and supplement label statements. A qualified health claim suggests credible research but with caveats about certainty.

What Structure-Function Claims Tell You

A structure-function claim indicates that a manufacturer believes the nutrient supports normal body function, but it does not mean the FDA has pre-approved the claim or verified the evidence. These claims range from well-researched (e.g., “vitamin D supports bone structure”) to speculative (e.g., “herbal blend supports mental clarity”). The lack of pre-approval requirement means you must independently verify the underlying research if the claim matters to your health decision.

Takeaway: Structure-function claims are the least regulated. You should treat them as manufacturer marketing unless you personally verify the supporting evidence through peer-reviewed literature or consult a healthcare provider.

Red Flags for Misleading Claims

Be skeptical of any label statement that:

• Uses disease language without FDA pre-approval notation (e.g., “cures,” “treats,” “prevents,” “diagnoses”)
• Makes exaggerated wellness promises (“miracle ingredient,” “scientifically proven to change your life”)
• Cites only manufacturer-funded studies without independent peer-reviewed research
• Offers a structure-function claim with no supporting citations or references
• Conflates correlation with causation (e.g., “people who take X live longer” without controlling for lifestyle factors)

Limitations and Gaps in the Current System

The Structure-Function Loophole

Because structure-function claims require no pre-approval, manufacturers can make increasingly bold wellness statements with minimal evidence. For example, dozens of supplements claim to “support cognitive function” or “enhance immune response” based on preliminary or single studies. The FDA only acts after a complaint or if the agency identifies clear false advertising—a reactive rather than preventive approach.

Publication Bias and Manufacturer Funding

Research consistently shows that manufacturer-funded studies report more favorable outcomes than independently funded research on the same ingredients. This bias can inflate the perceived evidence base for structure-function claims. Additionally, negative or null studies may never be published, leading to an incomplete picture of an ingredient's true effects.

Gaps in Long-Term Safety Evidence

Both health claims and structure-function claims focus on efficacy (does it work?) but often lack rigorous long-term safety data, especially for dietary supplement combinations. The FDA's post-market surveillance system for supplements is passive—manufacturers are not required to report adverse events as rigorously as pharmaceutical companies are.

International Regulatory Variation

The European Union, Canada, and other countries use different classification systems for health claims, making it difficult for multinational companies and consumers to apply a consistent standard. A claim approved in one country may be prohibited in another.

Related Topics

• How to Read Supplement Labels: Identifying key information and red flags on packaging
• The Role of Peer-Review in Health Research: Why publication in reputable journals matters
• FDA Pre-Approval vs. Post-Market Surveillance: How pharmaceutical and supplement oversight differ
• Evaluating Clinical Trial Quality: What makes a study design rigorous and trustworthy
• Conflict of Interest in Nutrition Science: How funding sources shape research outcomes