A dietary supplement should be compared by the label on the back of the pack, not by the big promise on the front. If you are buying vitamin D, magnesium, B-complex vitamins or “immune support” formulas, the useful questions are simple: what substance am I actually taking, in what daily amount, does it overlap with another product at home, and is there a medical reason why I should seek advice first?
In Romania, supplements are food products intended to complement the diet, not medicines. That does not mean they have no effects, or that every combination is suitable for everyone. High doses, repeated ingredients and interactions with treatments are why two packs with appealing labels can have very different safety profiles.
Start with the essential difference: a supplement is not treatment
Under European legislation, a dietary supplement is a concentrated source of nutrients or other substances with a nutritional or physiological effect, sold in small doses: capsules, tablets, drops, sachets or ampoules. Its correct sales description is “dietary supplement”.
The label, presentation and advertising must not claim that the product prevents, treats or cures a disease. They must also include the recommended daily serving, a warning not to exceed it, a statement that the supplement does not replace a varied diet, and a warning to keep it out of the reach of young children.
In practical terms, if you have persistent symptoms, an abnormal test result or an already diagnosed illness, a supplement should not become a substitute for medical assessment. This matters particularly when someone tries to address fatigue—which can have many different causes—with “vitamins for energy”, or an infection that needs a diagnosis with “immune support” products. In the case of bacterial infections, neither supplements nor antibiotics taken without medical advice are safe solutions; see also the explanation of the risks of using antibiotics incorrectly.
The four-step method for reading the label
1. Identify the active substance and its form
Do not stop at the brand name. “Energy”, “focus”, “sleep”, “beauty”, “immunity” or “detox” are marketing themes, not ingredients. Look for the specific list of vitamins, minerals, plant extracts, amino acids or other substances.
For vitamins and minerals, the label should state the numerical amount in the recommended daily serving. For plant-based products, it is worth checking whether the plant, the part of the plant used, the form of the ingredient and the amount are specified. A vague name such as “plant complex” provides less information for comparison than a transparent list with individual doses.
Inactive ingredients are relevant too. Sweeteners, flavourings, colourings, bulking agents or gelatine do not determine effectiveness, but they may matter if you have allergies, intolerances, dietary restrictions or prefer a particular dosage form.
2. Read the daily dose, not the dose per capsule
The serving size is where confusion most often arises. One capsule may appear to contain little of an ingredient, but the manufacturer may recommend two, three or four capsules a day. The correct comparison is based on the recommended daily dose.
Check the unit of measurement too. Milligrams and micrograms are not interchangeable: 1 milligram equals 1,000 micrograms. For vitamin D, the label may use micrograms or international units; 1 microgram of vitamin D is equivalent to 40 IU. A pack that appears better value because of a large number may simply use a different unit or state the dose for several capsules.
3. Calculate your total intake from all products you use
Do not assess a supplement in isolation if you already take a multivitamin, vitamin D drops, magnesium in the evening, hair products and a “cold relief” sachet. The same vitamin or mineral may appear in several products.
Make a list for a typical day. For each substance, add up the recommended doses from all supplements. You do not need to turn this exercise into a complicated calculation: the aim is to spot obvious duplication. Vitamin D, zinc, vitamin B6, magnesium and vitamin K are examples of ingredients that can easily recur across formulas.
Practical example: if a multivitamin provides vitamin D and you also use vitamin D drops, the relevant intake is their combined daily amount, not the figure on one of the packs. For adults, the tolerable upper limit listed in NIH fact sheets for vitamin D is 100 micrograms, or 4,000 IU, a day from all sources. Higher doses may be prescribed temporarily for a deficiency, but that is a medical context, not a general rule for purchasing supplements.
4. Read the percentage of the reference value without mistaking it for personal advice
For vitamins and minerals, you will often see a percentage of the nutrient reference value. It indicates how much the product’s daily serving contributes to the reference value used on the label. It is useful for guidance and comparison, but it does not automatically establish your individual requirements.
A very high percentage does not automatically make a product better. It may be justified in certain situations, but it may also simply be a commercial formulation choice. Requirements, absorption, diet, age, pregnancy, chronic illnesses and treatments can all change the discussion. More important than a striking percentage is whether there is a plausible reason for that ingredient and whether the dose suits your situation.
What “notified in Romania” can and cannot show
The Ministry of Health publishes registers and lists of dietary supplements notified through public health bodies. Checking them may be useful when you want to confirm that a product or brand appears in public records, especially if you are buying online or through an unfamiliar intermediary.
However, notification should not be interpreted as medical advice for you, or as individual clinical evidence that a product “works” for a particular symptom. This is an important distinction: the procedure concerns placing a product on the market and the documentation required under the administrative framework, whereas choosing a supplement for a specific health issue requires an assessment of the ingredient, dose, available evidence and personal risks.
For products containing vitamins and minerals, you can check the public register of vitamins and supplements, while the Ministry of Health separately publishes lists of dietary supplements notified to the CRSP. The absence of a result in a simple search is not, by itself, definitive: the name may differ and the lists are published by period. But a lack of transparency, an incomplete label or a seller who is difficult to identify are sufficient reasons not to buy until you have clarified the product.
For more information on nutrition, see also The importance of vitamins and minerals for health, which provides complementary details on this subject.
Health claims: check what the pack says, not what it suggests
In the European Union, nutrition and health claims are regulated, and the European Commission maintains a register of authorised and non-authorised claims. A lawful claim usually has precise wording: for example, it may refer to a nutrient’s contribution to a normal bodily function, under certain conditions of use.
That is different from the broad promise that a product “protects you from everything”, “eliminates fatigue”, “fixes hormones” or “detoxifies the body”. When the message is very broad, ask which ingredient it refers to, at what dose, and whether the product is making a promise about a disease. A supplement that appears to offer a universal answer to very different problems deserves an extra dose of scepticism.
| What you see on the packaging | What to check before buying | Why it matters |
|---|---|---|
| “Immunity” or “energy” | The ingredients and daily amount of each | The marketing theme does not show which substance produces the claimed effect. |
| “High dose” or “extra strength” | The total daily dose, including from other products | Doses can overlap without you noticing. |
| “100% natural” | The plant, extract, amount and warnings | “Natural” does not automatically mean free from adverse effects or interactions. |
| “Notified” | The public list and a Romanian-language label | Notification is not equivalent to proven effectiveness in your case. |
| Very high percentages of the NRV | The reason for use and the relevant safety limit | More does not necessarily mean more suitable. |
Three ingredients where overlap is worth noticing
Vitamin D
Vitamin D often appears in multivitamins, capsules, sprays, drops and products combined with vitamin K or calcium. Its very frequency makes duplicate dosing possible. Excessive intake from supplements can lead to excessively high calcium levels in the body and problems such as nausea, weakness, excessive thirst, frequent urination or kidney stones. People taking thiazide diuretics, steroids, orlistat or certain cholesterol treatments should discuss possible interactions with a healthcare professional.
Magnesium
Magnesium is often promoted for sleep, cramps, stress or post-exercise recovery. For adults, the upper limit mentioned by the NIH for magnesium from supplements and medicines is 350 mg a day; this does not apply to magnesium naturally present in food. Higher doses can cause diarrhoea, nausea and abdominal cramps. People with kidney disease, those using magnesium laxatives, or those taking antibiotics, diuretics or osteoporosis medicines should seek advice before adding another product.
Vitamin B6
Vitamin B6 is found in B-complex vitamins, energy products, hair and nail supplements, menopause formulas and products for athletes. It is a good example of why labels need to be read carefully. In 2023, the European Food Safety Authority established a tolerable upper intake level of 12 mg a day for adults. Long-term intake of high amounts from supplements has been associated with nerve damage. Do not assume that, because it is a water-soluble vitamin, it can be taken without limit.
When it is safer to ask a doctor or pharmacist first
Not every supplement requires a consultation, but there are situations in which choosing one based on hearsay becomes a bad idea. Seek personalised advice before starting a new product if any of the following apply:
- you are pregnant, breastfeeding or choosing a product for a child;
- you have kidney or liver disease, significant digestive disorders or an endocrine condition;
- you take anticoagulants, treatment for blood pressure, diabetes, epilepsy, thyroid disease or depression, or antibiotics;
- you are due to have surgery or an invasive procedure;
- you have abnormal test results and intend to treat a possible deficiency yourself;
- you want to combine several products containing the same vitamins, minerals or plants;
- you have experienced rashes, palpitations, digestive problems, numbness or other reactions after taking a supplement.
Your doctor or pharmacist needs specific information, not just the brand name. Take a photo of the label or note down the ingredients, daily doses and all medicines you take, including over-the-counter products. This list shortens the discussion and reduces the risk of an interaction being overlooked.
A quick check before paying
- Look for the term “dietary supplement” and a Romanian-language label.
- Note the recommended serving for one day, not just what one capsule contains.
- Compare active ingredients, not the slogans on the box.
- Add up repeated ingredients across all the products you use.
- Check the warnings, best-before date and responsible operator.
- Consult the relevant public register if the product is bought online or from a seller you do not know.
- Do not complete the purchase and seek advice if you are on long-term treatment, pregnant, or the product claims to treat a disease.
The right supplement is not the one with the most ingredients, nor the one with the most spectacular promise. It is a product whose composition you can understand, whose dose you can fit into your total intake, and for which there is a genuine reason to use it. If your goal is to support your diet, it is also worth starting with the foods you eat consistently; for example, food choices that support energy may be more relevant in the long term than adding another capsule.
Frequently asked questions
Is a dietary supplement notified in Romania automatically safe and effective?
Notification is relevant to placing the product on the market and can be checked in the available public registers. However, it does not constitute individual medical advice and does not demonstrate that the product treats a symptom or disease.
How do I check whether I am taking too much vitamin D from supplements?
Add up the daily amounts from all products containing vitamin D: multivitamins, capsules, drops, sprays or combination formulas. Check the unit of measurement: 1 microgram equals 40 IU. For high doses or treatment of a deficiency, speak with your doctor.
Does a high percentage of the nutrient reference value mean the supplement is better?
No. The percentage shows the daily serving’s contribution to a reference value, not your individual requirement. A very high percentage may be unnecessary or may increase the risk of overlap with other products.
Can I take magnesium at the same time as antibiotics?
Magnesium can reduce the absorption of some antibiotics by forming complexes in the digestive tract. Do not decide the interval between products yourself: ask the pharmacist or doctor what schedule is appropriate for the prescribed antibiotic.
