A Consumer Guide to U.S. Dietary Supplement Labels

Every dietary supplement sold in the United States must include a product label.

This label provides essential information to help you understand what the product contains, how to use it, and who is responsible for manufacturing or distributing it.

While some parts of a supplement label are strictly regulated by the U.S. Food and Drug Administration (FDA), others are flexible and vary from brand to brand.

In this article, we explain the key parts of a U.S. dietary supplement label and what each section means for you as a consumer.

Where helpful, we use examples from our EVYLO product label to illustrate how these requirements appear in practice.

 

Figure 1. EVYLO product label

 

The Three Key Parts of a Supplement Label

Front Panel (Principal Display Panel)

The front panel is the part of the bottle most visible on a store shelf.

It typically includes:

• Company or product name: the main name shown on the front, which may be the company name, the product name, or both. For example, our product name is “EVYLO.”
• Net contents: how much is inside the bottle or container and in what form. For example, “60 Vegan Capsules.”
• Product type (statement of identity): usually shown as “Dietary Supplement.”

The front panel is designed to help shoppers quickly understand who the product is from, what it is, and what area of wellness it supports.

 

Side and Back Panel

This section of the label usually contains practical information that helps consumers use the product safely and properly.

FDA labeling rules do not require specific information to appear on the “side panel” (left) or the “back panel” (right).

What the FDA requires is that certain information appears somewhere on the outside of the container.

Because of this flexibility, you may see required details—such as the Supplement Facts panel—placed on either side of the label.

Some information must appear by law, while others are optional and included at the brand’s discretion.

Below, we break down which components are required and which ones are optional.

 

Required components

• Supplement facts panel: This boxed panel provides the most important details about what the product contains, including:
• Serving size: How many capsules, gummies, scoops, or tablets you take at one time. This number is set by the company based on how the product is intended to be used.
• Servings per container: How many times you can take the product before the bottle is empty, based on the serving size.
• Ingredient amounts per serving: How much of each ingredient you get each time you take the serving size listed above.
• Daily values (if applicable): A percentage showing how much a nutrient in one serving contributes to the recommended daily intake (mainly used for vitamins and minerals).

 

Understanding serving size

Serving size can be a confusing topic for many consumers, partly because of how the FDA defines what must be listed on supplement labels.

According to FDA regulations, the serving size on a dietary supplement label must reflect the largest amount recommended at one time, rather than a flexible range.

Using EVYLO as an example: the recommended daily amount is 4–5 capsules.

However, if consumers follow our split-dose method, they would take no more than 3 capsules at one time, typically with each meal.

For this reason, our Supplement Facts panel lists a serving size of 3 capsules.

By law, supplement companies cannot list a range (such as "1-3 capsules") inside the Supplement Facts panel – only a single, fixed number is allowed.

This requirement can understandably create confusion, especially because daily servings for many supplements are not always fixed and may vary based on the product’s intended area of wellness support or guidance from a healthcare provider.

We recognize that serving-size rules can sometimes be confusing for consumers, and we support efforts that promote clarity and simplicity.

Because of these nuances, it’s important to pay close attention to the serving size listed on supplement labels, and to review the product’s suggested use or consult a healthcare professional or the supplement company if questions arise.

 

• Other ingredients: This section lists everything outside the main ingredients shown in the Supplement Facts panel, such as:
  • Capsule materials: The substances used to form the outer capsule, such as plant-based cellulose or gelatin, which hold the ingredients together.
  • Fillers and blending aids: Ingredients that help add volume and keep the formula evenly mixed.
  • Flavors or colorants: Ingredients added to improve taste, smell, or appearance, especially in powders, gummies, or liquids.
  • Flow agents used in manufacturing: Ingredients that help powders move smoothly through machinery during production to ensure consistent capsule or tablet filling.

It helps customers understand what else is in the product besides the main ingredients.

• Name and place of business: Labels must clearly identify the company responsible for manufacturing or distributing the product.

This includes the company’s name and address.

This information helps ensure traceability and provides a point of contact for customer questions.

 

Conditionally required components

These elements help consumers use the supplement safely and correctly.

Whether they are required depends on the specific product and what appears on the label.

• Suggested use (directions for use): This section explains how many capsules, tablets, scoops, or servings to take, and how often.

The FDA requires directions for use when they are needed to ensure the supplement is taken safely.

In practice, this applies to nearly all supplements.

The FDA does not pre-approve these instructions, which is why suggested use can vary widely, even among products with similar ingredients.

We’ve noticed this when comparing supplements that support areas like heart and metabolic wellness.

Consumers should:

• • Read this section closely
  • Understand the total daily intake and whether it aligns with your wellness goals
  • Consult a healthcare professional or manufacturer if unsure

Using a supplement incorrectly may affect your experience and may not support your wellness goals as intended.

• Disclaimers for structure-function claims:

Structure-function claims describe how nutrients or ingredients support normal body structure or function, such as:

• • Healthy cholesterol balance
  • Helps maintain normal energy levels

When these claims are used anywhere on the label, the FDA requires a standard disclaimer — often placed on the side or back panel — that reads:

“These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.”

This is the exact wording the FDA requires, which is why it appears the same across all supplement labels.

• Tamper-evident statement:

Most supplements come with a protective seal so you can tell whether the product has been opened before purchase (this feature is known as “tamper evidence”).

In these cases, the label must explain what this seal looks like and remind consumers not to use the product if the seal is missing or broken.

• Warnings or other declarations:

Certain ingredients or safety considerations can trigger required warnings on supplement labels.

Examples include:

• • Iron-containing products must include an accidental overdose warning.
  • Allergens must be clearly disclosed when present.
  • High-caffeine supplements require a caution statement advising that they are not recommended for children, pregnant or nursing women, or individuals sensitive to caffeine.

This section helps consumers use the product safely and understand any important considerations.

In addition to required warnings, many brands also include optional statements to support transparency and safe use—such as noting relevant medical conditions, potential medication interactions, or considerations for pregnancy or nursing when appropriate.

Clear, specific guidance is far more helpful than generic statements.

When warnings are too broad or vague, consumers may overlook them or treat them as boilerplate text.

Targeted, easy-to-understand information makes it easier for people to know when they should take extra care or consult a healthcare professional.

 

Optional Content That May Appear on Any Side of the Panel

These elements are not required by the FDA.

Supplement companies have full flexibility in deciding whether to include them and where they appear.

• Highlighted ingredients: Some brands choose to feature key ingredients—often on the front panel.
• Structure-function claims: These frequently appear on the front panel but can appear elsewhere.
• Certifications and seals: Examples include Non-GMO, third-party tested, vegan, or NSF Content Certified Mark. 

Some of these are legitimate third-party certifications, while others are brand-created icons that may not represent any independent verification.

Because these symbols are not consistently regulated, consumers should look closely to understand what each one actually means.

• Flavor: Often included for powders, liquid, and gummies to clarify taste.
• Company or product (brand) website: The company or product’s official website may be listed for reference.
• Trademark or ingredient notices: Statements given credit or legal recognition to branded ingredients or technologies used in the product.

These are not FDA-required, but trademark owners may require them.

• Barcode/UPC: Used to track inventory and identify the exact product.

Not required by the FDA, but expected by major retailers (like Amazon, CVS, Target, Trader Joes).

• Lot number: A code that identifies the specific batch of the product.

Manufacturers use it for quality control and to locate products if a safety issue or recall occurs.

 

Wrapping It All Up: What Consumers Should Pay Special Attention To

1. Supplement Facts Panel & Other Ingredients

• Look at how much of each ingredient is included in one serving.
• Be cautious with proprietary blends, since exact ingredient amounts are not disclosed.
• Check both the Other Ingredients section and any allergen statement for allergens or additives you may want to avoid.

2. Suggest Use

• Usage directions can differ widely among brands.
• Compare daily amounts across brands.
• Select products that provide clear and accurate information.
• If unsure, consult a healthcare professional or contact the supplement company.

3. Serving Size

• Serving size is set according to FDA rules, so it may not always feel intuitive.
• Serving size helps you calculate how much of each ingredient you get per capsule, gummy, or scoop.
• Example: if a serving size is 3 capsules and the formula contains 750mg of berberine HCl per serving, then each capsule contains 250mg (750 ÷ 3).

4. Warnings & Other Declarations

• Look for clear, specific warnings or disclosures.
• If you have questions, medical conditions, or take medications, check with a healthcare professional.

5. Certifications and seals

• Look for reputable third-party certifications from recognized organizations.
• Be cautious of decorative icons or symbols that may not reflect verified quality.

 

Final Thoughts

Dietary supplement labels contain essential information that helps you choose and use products safely and effectively.

While some parts are tightly regulated, others vary by brand.

Understanding each component empowers you to make informed, confident decisions aligned with your needs and preferences.

We hope this guide helps you feel more prepared to navigate supplement labels and make choices that work best for you.

 

Sincerely,

Derek Tang, PhD, MS, BSPharm

Truth Full Health

Your Trusted Supplement Partner

*Disclaimer: all blogged content is for informational purposes only and does not replace professional medical advice. The statements made regarding dietary supplements (vitamins and supplements) have not been evaluated by the Food and Drug Administration (FDA). These products are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare provider before beginning any new supplement, diet, or health regimen.