Look for sodium in milligrams and read the basis of the figure. Some effervescent formulations use sodium-containing ingredients such as sodium bicarbonate. The ingredient name tells you it is present. To compare amounts, you need the quantity on the nutrition panel or a figure confirmed by the manufacturer.
Put both labels on the same basis
Suppose Pack A declares 60 mg sodium per tablet and its labelled serving is two tablets. It supplies 120 mg per labelled serving. Pack B declares 90 mg sodium per serving and a serving is one tablet. On a serving basis, you are comparing 120 mg with 90 mg. These are fictional numbers. Use your own pack’s directions and figures.
If a label uses 100 g of dry product, find the weight of the labelled serving before converting. If it uses 100 ml of the prepared drink, use the preparation volume it specifies. A figure on one basis can look smaller while the serving supplies more.
When the sodium amount is missing
Send a back-of-pack photo and ask, “How many milligrams of sodium are in the recommended serving of this exact product?” Include the variant and batch if you already have the tube. Keep the answer beside the directions so you can see whether it refers to one tablet or one serving. If you have a prescribed sodium or fluid restriction, show the label and answer to the professional helping you manage it.
The effervescent-versus-capsule comparison covers the rest of the format decision. For a drink described as an electrolyte product, check its intended use separately using the ORS comparison.