How to Read a Supplement Label: EU vs US Complete Guide (2026)

A supplement label looks like a nutrition label, but it is regulated differently, structured differently, and — depending on whether it was printed in Topeka or Turin — calculates its daily values against different reference populations. Reading it with confidence means understanding what each line is legally required to disclose, what it is allowed to hide, and which marketing claims are effectively meaningless because any product can make them. This guide walks through every element of a US Supplement Facts panel and its EU food-supplement equivalent, line by line, with the specific regulation behind each requirement and practical guidance on what to check when choosing a product.

Label literacy is a force multiplier. A consumer who can read labels correctly does not need a guru — the information required by FDA 21 CFR 101.36 and EU Directive 2002/46/EC is enough to distinguish a thoughtfully formulated product from a filler-heavy one. Nutrola's Daily Essentials at $49/mo is EU certified and lab tested, and the label is designed to be maximally informative under both regulatory systems.

The US Supplement Facts Panel

Serving Size and Servings Per Container

The first line. Dose comparisons across brands only work once you normalise on serving size. A "2,000 mg" front-of-bottle number that turns out to be "per two capsules" is half what it appears.

Amount Per Serving and % Daily Value

Below serving size, each nutrient is listed by weight (mg, mcg, IU) followed by its % Daily Value (%DV). The DV is a reference number set by FDA in 21 CFR 101.9 based on a 2,000-kcal reference diet and updated in 2016 to align with modern intake data. Some nutrients (B12, vitamin D, folate) changed units in that update — older bottles may still show the earlier units.

A dagger or asterisk next to a nutrient with "no DV established" means FDA has not set a reference value — common for ingredients like CoQ10, curcumin or probiotics.

Proprietary Blends

The most controversial US-only labelling feature. Under 21 CFR 101.36(c), a "proprietary blend" may list the total weight of the blend but omit the individual ingredient weights, provided the ingredients are listed in descending order by weight. The result: you can see a blend is 500 mg and contains ashwagandha, rhodiola and holy basil, but not whether it is 490 mg of one and 5 mg each of the others. Consumer advocates, ConsumerLab and the Council for Responsible Nutrition have all published critiques. Transparent brands publish every weight.

Other Ingredients

Everything that is not an active nutrient appears here: capsule material (gelatin vs HPMC), flow agents (magnesium stearate, silicon dioxide), binders, colours. Disclosure is mandatory but quantities are not required.

The EU Food Supplement Label

Ingredient List in Descending Order

EU Regulation 1169/2011 (Food Information to Consumers, FIC) and Directive 2002/46/EC require a full ingredient list in descending order by weight at the time of use. Every ingredient must appear with its specific name. Allergens within the list are highlighted in bold (wheat, milk, soy, and so on).

Nutrient Reference Values (NRVs)

The EU equivalent of %DV is %NRV. NRVs are defined in Annex XIII of Regulation 1169/2011 and in Directive 2008/100/EC. They are broadly similar to US DVs but with some notable differences (vitamin D NRV of 5 μg / 200 IU, vs US DV of 20 μg / 800 IU updated in 2016; vitamin B12 NRV 2.5 μg, vs US DV 2.4 μg).

Maximum Recommended Daily Dose

EU labels state a recommended daily portion. Exceeding it must be discouraged on-label. Some nutrients also have member-state-set maximum safe levels above which the product may not legally be sold as a supplement.

Mandatory Warnings

EU labels must state that food supplements are not a substitute for a varied diet, must be kept out of reach of children, and must not be used in place of medical treatment. These phrases are boilerplate but legally mandatory.

Lot Number and Best-Before Date

FIC requires lot identification and a date of minimum durability. US 21 CFR Part 111 GMP requires lot codes for traceability, but printing a best-before or use-by date is not strictly mandatory on US supplement labels (though most responsible brands do).

Comparison Table: US vs EU Label Elements

Element	US label	EU label	What to look for
Panel title	"Supplement Facts"	"Nutrition information" / ingredient statement	Both mandatory in specified formats
Reference values	%DV (FDA 21 CFR 101.9)	%NRV (FIC Reg. 1169/2011)	Small numerical differences for several nutrients
Proprietary blend disclosure	Allowed	Not allowed — full weights required	EU labels are more transparent
Allergen emphasis	Bold highlight required (FALCPA 2004; FASTER Act 2021 added sesame)	Bold highlight required (FIC)	Both legally binding
Other ingredients/excipients	"Other ingredients" line	Part of main ingredient list in descending order	EU integrates, US separates
Nutrient form disclosure	Specific form required (e.g., "as cholecalciferol")	Specific form required (Annex II of 2002/46/EC)	Read forms, not just names
Warning statements	Limited mandatory text	Standardised EU warnings	EU wording is more prescriptive
Best-before date	Not strictly mandatory	Mandatory under FIC	Best-before is a date, not a "throw-away" cliff

Nutrient Form: Where It Quietly Matters

The label may read "Vitamin D 25 mcg" — but the bioactive form is specified on the supplement as either vitamin D3 (cholecalciferol) or D2 (ergocalciferol). D3 raises serum 25(OH)D more effectively per microgram. Similarly: magnesium oxide vs bisglycinate vs citrate; folic acid vs folate (5-MTHF); cyanocobalamin vs methylcobalamin for B12.

EU labels name the specific substance because only substances on Annex II of Directive 2002/46/EC are permitted. US labels are required to name the source under 21 CFR 101.4.

Excipients: What "Other Ingredients" Actually Are

Flow Agents and Lubricants

Magnesium stearate and silicon dioxide keep powders moving through tablet presses. Both have been the subject of popular-health scaremongering but the scientific case against them in the micro-gram to low-milligram quantities used is weak. EFSA has re-evaluated magnesium salts of fatty acids and affirmed their food-additive status. The NIH Office of Dietary Supplements does not list magnesium stearate as a safety concern at supplement exposure levels.

Capsule Shells

Gelatin (bovine or porcine) vs vegetarian HPMC (hydroxypropyl methylcellulose) is a dietary-preference choice, not a bioavailability one at conventional doses.

Fillers and Binders

Microcrystalline cellulose, rice flour, dicalcium phosphate. These are inert carriers that allow consistent dosing. They matter for people with specific intolerances; otherwise they are background.

Colours and Sweeteners

EU Regulation 1333/2008 governs food additives and lists E-numbers. US labelling uses common names. Both are safe at permitted levels but may matter for individual sensitivities.

Claims: What a Label Can Legally Say

US

Structure/function claims ("supports immune function") allowed with the disclaimer: "This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease." Disease claims require drug approval.

EU

Only claims listed in the EU Register of Nutrition and Health Claims (Regulation 1924/2006) may be used. Examples: "Vitamin D contributes to the normal function of the immune system" — permitted. Ashwagandha claims for stress — not permitted.

What to Check Before You Buy

1. Serving size — how many capsules or scoops per day.
2. Active ingredients and doses — compare to NIH ODS fact sheet recommended ranges.
3. Specific nutrient forms — vitamin D3, methylfolate vs folic acid, menaquinone-7 for K2.
4. No proprietary blends, or if there are, full transparency available on the brand site.
5. Third-party testing (NSF, USP, Informed Sport, ConsumerLab).
6. Lot code and best-before date visible.
7. Manufacturer address — EU certified manufacturing, US cGMP-compliant facility, etc.

Nutrola's Daily Essentials satisfies all seven, which is part of why the brand sits at 4.9 stars across 1,340,080 reviews.

Frequently Asked Questions

Are %DV and %NRV interchangeable?

Close, but not identical. They are built on similar reference populations but updated on different timelines. For most vitamins and minerals the numbers are within 10-20 % of each other; a few (vitamin D post-2016 US update) differ substantially.

Is magnesium stearate dangerous?

No published authoritative body (FDA, EFSA, NIH ODS) treats magnesium stearate at supplement-relevant doses as a safety concern. Popular health claims against it rely on a small number of cell-line studies that do not translate to normal dietary exposures.

Why do EU labels not list %DV?

Because %DV is a US regulatory metric. The EU uses its own Nutrient Reference Values defined in Regulation 1169/2011.

Can I trust a "natural" or "clinically proven" label?

These terms are not tightly defined in either system. The EU permits health claims only from the authorised register; everything else is marketing. Read the ingredient list and dose, not the adjectives.

What does "proprietary blend" hide in practice?

It can legally hide whether a blend is mostly one ingredient at effective dose and others at trivial "fairy dust" doses. Transparent brands publish every weight. If a blend's breakdown is not available on request, treat that as a red flag.

Citations

1. U.S. Food and Drug Administration. 21 CFR 101.36 — Nutrition labeling of dietary supplements.
2. U.S. Food and Drug Administration. 21 CFR 101.9 — Nutrition labeling of food (Daily Values).
3. European Parliament and Council. Regulation (EU) No 1169/2011 on the provision of food information to consumers.
4. European Parliament and Council. Directive 2002/46/EC on food supplements (Annex II list of substances).
5. European Commission. Regulation (EC) No 1924/2006 on nutrition and health claims made on foods.
6. National Institutes of Health Office of Dietary Supplements. Fact sheets on vitamins and minerals.
7. Food Allergy Safety, Treatment, Education, and Research Act (FASTER Act) of 2021 (sesame as a major allergen in the US).