В данном случае - в натрии.

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Note added at 36 мин (2019-12-18 19:46:58 GMT)
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Как читать этикетки продуктов, чтобы купить именно то, что хотели

Процент от суточной потребности обязательно указывается для биологически активных добавок (БАД) и обогащенных продуктов – в отношении веществ, источником которых они являются.
https://roscontrol.com/project/article/chto-dolgno-bit-na-et...

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Note added at 39 мин (2019-12-18 19:50:38 GMT)
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What do the Daily Value numbers mean on food labels?

Percent Daily Value (DV) on the Nutrition Facts label is a guide to the nutrients in one serving of food. For example, if the label lists 15% for calcium, it means that one serving provides 15% of the calcium you need each day.

DVs are based on a 2,000-calorie diet for healthy adults. Even if your diet is higher or lower in calories, you can still use the DV as a guide. For example, it tells you whether a food is high or low in a specific nutrient, defined as follows:

Low: 5% or less of a nutrient
High: 20% or more of a nutrient
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-h...