How to read a dietary supplement label – a guide for the informed consumer
A dietary supplement label is much more than just graphics and a name – it is a document containing precise information about the product’s composition, dosage, allergens and origin. Find out exactly what should be included on it in accordance with Polish and EU regulations, and how to read it critically, separating facts from marketing claims.
Making an informed choice when buying a dietary supplement starts with the ability to read the label critically. It is on the label that you’ll find most of the information needed to assess whether the product truly meets your needs – from the chemical form of the ingredients to the full list of excipients. In Poland and throughout the European Union, the content of dietary supplement labels is governed by specific regulations: Regulation (EU) No 1169/2011 on the provision of food information to consumers and Regulation (EC) No 1924/2006 on nutrition and health claims. These documents specify what MUST appear on the label and which phrases are permitted. This guide will teach you what to look out for and how to use the label as a tool for an informed consumer – not a passive recipient of marketing.
What MUST be on the label – mandatory elements
Polish and EU regulations specify the list of mandatory information for every food supplement. The absence of any of these elements is a sign that the product may not meet legal requirements – which in itself should prompt justified caution.
1. Product name and category – an unambiguous name identifying the product and the statement that it is a “dietary supplement” (this is a mandatory phrase). The label must not suggest that the product is a medicine, a cosmetic or a food for special medical purposes.
2. Full list of ingredients – a list of all ingredients in descending order by weight. This includes both active ingredients (e.g. vitamins, minerals, plant extracts) and excipients (fillers, capsule shells, anti-caking agents).
3. Active ingredient content – precise quantities of each active ingredient per daily dose. For vitamins and minerals, the percentage of the reference intake (% RWS or % NRV) is usually also indicated.
4. Chemical form of ingredients – for minerals and certain vitamins, the chemical form should be specified (e.g. magnesium citrate, zinc picolinate, cholecalciferol as a form of vitamin D). The absence of this information constitutes a significant information shortcoming.
5. Recommended daily intake – a clearly specified daily dose and a warning not to exceed it.
6. Warning regarding the role of the supplement – a mandatory statement informing consumers that “a food supplement must not be used as a substitute for a varied diet” and that “a balanced diet and a healthy lifestyle should be maintained”.
7. Storage information – storage conditions (temperature, light exposure) and the statement “keep out of reach of children”.
8. Date of minimum durability or expiry date – together with information on the production batch number.
9. Information on the manufacturer / responsible operator – full name and address of the manufacturer or distributor responsible for placing the product on the EU market.
10. Allergens – clear indication of the presence of allergenic ingredients in accordance with the list set out in Regulation 1169/2011 (e.g. gluten, soya, milk, eggs, nuts, fish).
11. GIS registration number – in Poland, every food supplement must be registered with the Chief Sanitary Inspectorate. The registration number is not always shown on the label, but the manufacturer should provide this information on request.
Active ingredient content – what you need to know
This is probably the most important section of the label. Here you will find the specific doses of what you are buying – not marketing claims, but actual figures. A few key rules for reading the label:
Pay attention to the amount of the elemental form, not the amount of the salt. A label stating ‘Magnesium 200 mg’ usually refers to elemental magnesium – that is, the element that is actually absorbed and acts within the body. The mass of the entire compound (e.g. magnesium citrate) is greater, but this is irrelevant to its effect – what matters is the amount of the element.
% RDA (Recommended Daily Allowance) is a comparison of the content in a daily portion with the established reference values for an adult. The RDA is not a minimum requirement – it is a reference value for assessing how much of a given nutrient the preparation provides. Values above 100% of the RWS mean that the serving exceeds the reference intake – and this does not always mean ‘better’.
The chemical form is of real importance. Citrate, bisglycinate, picolinate – these are different forms of minerals with varying bioavailability and gastric tolerance. A reputable manufacturer clearly states the form. You can find out more about the importance of mineral forms in the articles which magnesium is best and magnesium citrate.
Standardisation of plant extracts - for preparations containing plant extracts (turmeric, ashwagandha, ginseng, chaste tree, etc.), a reputable manufacturer will provide information on standardisation – that is, the content of specific active compounds (e.g. ‘turmeric extract standardised to 95% curcuminoids’). A lack of standardisation means you do not know exactly what you are buying.
[products:zinc-15-mg-selenium-200-mcg-120-capsules, vitamin-d3-4000-iu-120-capsules, omega-3-forte-1000-mg-120-capsules, magnesium-100-mg-potassium-150-mg-vitamin-b6-10-mg-120-capsules]
Health claims – what they mean and how to recognise them
Health claims on dietary supplement labels are strictly regulated by European law. Manufacturers may only use wording from the so-called EFSA register of claims (European Food Safety Authority) – and only for ingredients for which these claims have been approved.
Examples of correct, approved claims:
- “Vitamin C contributes to the normal functioning of the immune system.”
- “Magnesium contributes to the reduction of tiredness and fatigue.”
- “EPA and DHA contribute to the normal functioning of the heart.”
The sentence structure is characteristic – “contributes to the normal functioning”, “supports the maintenance of”, “plays a role in” – these are cautious, descriptive phrases that do not promise specific therapeutic effects.
Red flags in statements on labels or in marketing communications:
- “Treats”, “will cure”, “combats disease X” – these are PROHIBITED phrases in the case of food supplements. A supplement must not be attributed with therapeutic properties.
- “Miraculous effect”, “revolutionary effectiveness”, “scientifically proven” (without a specific statement from the EFSA register) – this is marketing hype that fails to meet the standards of reliable communication.
- “The best in Poland”, “No. 1 on the market”, “Recommended by 9 out of 10 specialists” – unverifiable statements of this kind are problematic in communications about supplements.
– Claims about “detoxification”, “fat burning” and “hormone regulation” – most of these types of statements have no basis in the approved EFSA register.
Excipients – what to look out for
Excipients are everything apart from the active ingredients – fillers, capsule shells, anti-caking agents, anti-agglomerants, colourings and flavourings. Their presence and quality distinguish high-quality preparations from cheaper alternatives.
Common, neutral excipients (not a problem in typical quantities):
- Hydroxypropyl methylcellulose, gelatine – capsule shell materials
- Maltodextrin, microcrystalline cellulose – classic fillers
- Magnesium salts of fatty acids – anti-caking agent
Ingredients worth paying attention to:
- Artificial colourings (labelled with ‘E’ codes followed by numbers) – most health-conscious consumers prefer products without artificial colourings
- Artificial sweeteners (aspartame, sucralose, acesulfame K) – mainly found in powdered or chewing gum-based products
- Preservatives – most capsules do not require preservatives, but some liquid preparations may contain them
- Talc, titanium dioxide – once common, but now increasingly being replaced by modern alternatives
A clean formula without artificial additives is not just a marketing slogan – it makes a real difference to quality. A reputable manufacturer transparently declares the full list of ingredients and does not hide ‘fillers’ behind complicated language.
[tip: The principle of minimalism in ingredients – the shorter the list of excipients, the better. Ideal products contain only the active ingredient + the capsule material + possibly 1–2 essential excipients. Long lists featuring colourings, sweeteners and fillers indicate lower production quality.]
Product origin – why it matters
The label should include information about the manufacturer or the entity responsible for placing the product on the EU market. This is more than just a formality – it is the first line of verification of credibility.
A Polish or European manufacturer means that the product is subject to stringent EU standards, including:
- Registration requirements with the relevant authorities (in Poland – GIS)
- GMP (Good Manufacturing Practice) standards in production
- Full legal responsibility for the product’s compliance with its claims
- The possibility of inspection by supervisory authorities
Supplements of unclear origin (mainly sold on marketplace platforms without a European distributor) may not meet these standards – which poses a real risk to consumer safety. For example, undeclared pharmacological substances or levels of heavy metal contamination exceeding the permitted limits have sometimes been detected in products originating from outside the EU. You can find the full range of Vitaler’s supplements in the category All supplements.
Dosage form – capsule, tablet, drops, powder
The physical form of a supplement affects its bioavailability, ease of dosing and tolerability – although for many ingredients this is not a decisive factor.
Capsules – soluble coatings (most commonly hydroxypropyl methylcellulose for vegans or gelatine). They protect the contents from light and air and are easy to swallow. Suitable for most types of ingredients.
Tablets – a compressed solid form. They often require additional fillers to facilitate compression. They may have an enteric coating for ingredients sensitive to stomach acid.
Drops – a liquid form on a fatty carrier (oils), ideal for fat-soluble vitamins (D, K, ADEK). Allows for flexible dosing.
Powder – the classic form for amino acids, creatine, collagen and isotonic drinks. It allows for higher doses per serving and flexible dosing. It needs to be dissolved in water or another drink.
The choice of form depends on personal preference and the specific nature of the ingredient. An informed consumer chooses the form that suits their routine, rather than the ‘trendier’ one.
What the label should NOT contain
Certain elements on the label are warning signs – they indicate lower production quality or communication that does not comply with good industry practices:
No declaration of the chemical form of minerals – if the label only states “100 mg magnesium” without specifying the form (citrate, oxide, etc.), this constitutes a significant information shortfall. An informed consumer does not know exactly what they are buying.
Lack of standardisation of plant extracts – for preparations containing extracts of turmeric, ashwagandha, chaste tree or other plants, the absence of information on standardisation poses a risk of unpredictable levels of active compounds between batches.
Medicinal claims – phrases such as ‘cures’, ‘treatment’, ‘therapy’ or ‘remedy for X’ are PROHIBITED in the case of supplements. Their presence on the label indicates either the manufacturer’s ignorance of the regulations or a deliberate breach of them.
Vague, unverifiable quality claims – “premium quality”, “pharmaceutical grade”, “clinically proven efficacy” without specific certificates or references to studies are merely marketing hype.
Absence of allergens – if the ingredients suggest the presence of potential allergens (e.g. fish oil, cereal extracts, dairy products) but the label does not declare them, this constitutes a significant regulatory breach.
Practical steps – how to assess a supplement in 2 minutes
Making an informed assessment of the label does not require pharmaceutical knowledge – a systematic approach is all that is needed. Step by step:
Step 1 – Check the full list of ingredients. Is the chemical form and specific dose given for each active ingredient? Is the list of excipients short and clear?
Step 2 – Compare with the RDA. Are the doses reasonable (usually 50–200% of the RDA)? Very high values (several thousand per cent) require consultation with a doctor.
Step 3 – Check the health claims. Are they worded cautiously (“contributes to the normal…”), or do they promise “miraculous effects”?
Step 4 – Check the manufacturer. Is the responsible entity in the EU clearly identified? Does the manufacturer have a transparent website with product documentation?
Step 5 – Read the allergens and contraindications. Does it contain any ingredients to which you are allergic? Are there any significant contraindications for your health condition?
[note: Vitaler transparently declares the chemical forms of all active ingredients, specifies the standardisation of plant extracts and avoids artificial colourings, preservatives and unnecessary fillers. This is the basis of trust for the informed consumer – quality that can be verified on the label.]
Additional information worth looking for
Apart from the mandatory label details, reputable manufacturers often provide additional documents confirming the product’s quality – usually on their website:
GMP (Good Manufacturing Practice) – confirming production standards.
HACCP certificates – relating to food safety.
Organic certificates – for products of agricultural origin (e.g. oils, herbal extracts).
Vegetarian/vegan certificates – for those on a plant-based diet.
, halal and kosher certificates – for those following religious dietary standards.
Test results for production batches – the best manufacturers publish the results of independent analyses confirming the declared content of active ingredients. You can find the full range of certified vitamins in the Vitamins category. You can find out more about making informed choices regarding supplementation in the article how to ensure a balanced diet.
[warning:Labels are an important tool for the informed consumer, but they are no substitute for medical advice. If you are taking long-term medication, have a chronic condition, are pregnant, breastfeeding or planning to give supplements to a child, it is advisable to discuss the decision to introduce a new supplement with your GP, a dietitian or a pharmacist. Labels provide information, but interpreting this information in the context of a specific health situation requires professional assessment.]
FAQ – frequently asked questions about reading labels
What does ‘% RWS’ or ‘% NRV’ mean on the label
RWS (Reference Intake Values, or NRV - Nutrient Reference Values) are reference intake values for vitamins and minerals for adults, set at EU level. The label states what percentage of the NRV a daily portion of the product provides. Values of around 100% of the RWS correspond to an adult’s daily requirement; higher values indicate a serving that exceeds the reference – which is sometimes justified (e.g. treating deficiencies following consultation with a doctor), and sometimes not.
Is a “natural” supplement always the better choice?
‘Natural’ as a term has no precise legal definition in the context of supplements. A better criterion is: a pure composition free from artificial colourings and preservatives, the declared chemical form of the ingredients, standardisation of plant extracts, and a transparent manufacturer. These are objective quality characteristics, whereas ‘natural’ is often merely a marketing slogan.
Why are some supplements more expensive than others
The price of a supplement depends on several factors: the quality and chemical form of the ingredients (e.g. magnesium bisglycinate is more expensive to produce than magnesium oxide), the standardisation of extracts, the quality of manufacturing processes, certification, packaging (glass jars vs. plastic) and marketing. A higher price does not always mean higher quality, but a very low price is often associated with compromises in the quality of ingredients or processes.
Is it worth checking batch test results?
Yes, if the manufacturer makes them available. Independent analyses of production batches confirm that the declared content of active ingredients corresponds to the actual content. This provides an additional level of transparency, which reputable manufacturers are increasingly offering to their consumers.
Summary: A dietary supplement label is a document containing information that is strictly regulated by law – composition, dosage, health claims, allergens and origin. Reading the label carefully allows you to separate facts from marketing and make purchasing decisions based on reliable data, not on advertising. Key elements to check include: the chemical form of the ingredients, the standardisation of plant extracts, the manufacturer’s transparency, carefully worded health claims (in line with the EFSA register) and a full list of excipients. A good supplement is one where the manufacturer is not afraid of a detailed label – because the quality of the product is confirmed precisely by these details. If you have any doubts about specific products or interactions with medicines, always consult your doctor, dietitian or pharmacist.