A supplement says “100% RDA” beside a vitamin. That does not mean your body has been tested and found to need that amount. It means the product is comparing a stated serving with a reference intake. You still need to know which reference, which group of people and how large a serving.
Read the percentage with the nutrient name and amount. A percentage on its own is a poor basis for choosing between packs, especially when you already take a prescribed vitamin or another supplement.
What RDA is trying to describe
RDA means Recommended Dietary Allowance. It is a reference for planning adequate intake in healthy people. Requirements differ across age and life stage; a reference for adults is not automatically the right reference for a child or someone who is pregnant.
India's nutrient recommendations are developed by ICMR–National Institute of Nutrition. Its nutrient-requirement work distinguishes recommended allowances from estimated average requirements and tolerable upper limits. Those are different questions, not competing names for the same number. ICMR's explanation of the Indian reference framework.
For a shopper, the useful question is simple: what reference does this label use? If it is not clear, ask the manufacturer. Do not replace an Indian reference with a figure from a US website just because that figure is easier to find.
Match the percentage to the serving
Here is an imaginary example, not a Nutrigap or Diabaut label. Suppose a reference amount is 10 mg and a serving supplies 5 mg. The label comparison would be 50% of that reference. If the recommended serving is two tablets, those two tablets together provide the stated 5 mg. One tablet would not provide the full labelled serving.
The arithmetic explains a label; it does not select your dose. You should not double a serving merely to make a percentage reach 100.
Look at the column heading too. A panel may state values per serving, per 100 g or per 100 ml. FSSAI's label guide explains why the serving and total pack contents need to be checked together. FSSAI: serving size and nutrition panels.
Why a bigger percentage is not always a better purchase
A higher percentage might be relevant to a particular clinical need, or it might simply add more of something you already get elsewhere. Your ordinary food, fortified foods and other products belong in that discussion.
Upper limits describe a different concept from recommended intake. They are not targets to aim for. The details depend on the nutrient and sometimes on its source or form, so avoid a general rule that every nutrient becomes unsafe at exactly the same multiple of RDA. NIH's reference guide explains the distinction; its numerical values are based on a US framework and should not be silently presented as Indian label rules. NIH: nutrient reference terms.
If a doctor has prescribed an amount for a diagnosed need, take the proposed alternative label to them before changing products. Matching one percentage is not enough to establish that two formulations are interchangeable.
Check for overlap in the products you use
Imagine buying a daily multivitamin while already taking a separate prescribed nutrient. Before comparing prices, put both labels in one place. Record the amount and actual frequency for each. The question is what the combination supplies, not which pack has the most impressive front panel.
Do not stop a prescribed product to remove an apparent duplicate on your own. Ask your doctor or pharmacist to review the list and tell you what should continue. Our appointment checklist helps you prepare that conversation.
A short label note you can keep
| Detail | What to write down |
|---|---|
| Nutrient | The exact name on the panel |
| Amount and unit | For example, the stated mg or micrograms |
| Serving | Number of tablets or volume described |
| Reference | The RDA basis or group stated on the pack |
| Overlap | Another product containing the same nutrient |
| Unanswered question | What the manufacturer or pharmacist should clarify |
If the reference basis is missing, write “not stated” rather than filling it in from a different brand. If the ingredient amount is not declared separately, a percentage cannot be reconstructed reliably by guessing.
Use our label-reading guide to check the rest of the pack, then compare cost per serving only after you understand what each serving contains. A useful comparison starts with like-for-like information.
If you are comparing Herbadose products
Start with the complete pack information.
Read the ingredients, directions and cautions. Product support can clarify pack and order details; ask your doctor or pharmacist about individual suitability.