Words such as “good” and “excellent” can sound like marketing opinions, but on U.S. food labels they have defined nutritional meanings when they describe the level of a nutrient. For nutrients with an established Daily Value, a “good source” claim generally corresponds to 10–19% of the Daily Value per reference amount customarily consumed, while “high,” “rich in,” or “excellent source” generally requires 20% or more. Those thresholds make the phrases useful shortcuts, but they still need to be read alongside serving size, the nutrient itself, and the rest of the food’s Nutrition Facts.
Good source occupies the middle band
A food that qualifies as a good source provides enough of the named nutrient to reach at least 10% of its Daily Value but less than the threshold for a high claim. That can apply to vitamins, minerals, fiber, protein, and other nutrients when the regulatory conditions for the specific claim are met. The key is that the statement is nutrient-specific. A cereal can be a good source of iron while being a poor source of potassium; a yogurt can be a good source of calcium without the claim saying anything about added sugar. Always ask “a good source of what?” before allowing the positive wording to color your judgment of the entire product.
Excellent source, high, and rich in signal the upper band
FDA permits terms such as “high,” “rich in,” and “excellent source of” when the food contains 20% or more of the Daily Value for the nutrient per reference amount, subject to the detailed labeling rules. The word “excellent” therefore does not mean nutritionally perfect; it means the named nutrient reaches a defined concentration. A food can legitimately be an excellent source of one nutrient and still be high in sodium, saturated fat, or added sugars. Front-label claims highlight selected facts, whereas the Nutrition Facts panel gives a broader picture.
Percent Daily Value is the quickest way to check the claim
The % Daily Value column tells you how much one labeled serving contributes to a standardized daily reference. FDA’s general reading rule is that 5% DV or less is low and 20% DV or more is high. That makes it easy to verify the direction of a claim: if calcium is 25% DV per serving, the food is high in calcium by the usual framework; if fiber is 12% DV, it sits in the good-source range. The exact legal basis uses the reference amount customarily consumed and other conditions, so a front-label claim is not always reconstructed perfectly from a rounded Nutrition Facts number, but the panel is still the best consumer check.
Serving size prevents small packages from gaming your intuition
A percentage only makes sense with the amount of food that provides it. If a package contains two servings and you eat both, you consume roughly twice the labeled nutrient amount and twice the calories, sodium, added sugars, and other values. The nutrient-content claim itself is made under regulatory serving rules; your actual intake depends on your portion. This also matters when comparing products. One bar may claim “excellent source of protein” with a large serving while another provides a similar number of protein grams in a smaller food. Compare grams and serving sizes when the practical goal is protein intake rather than label wording.
Daily Values are reference points, not personalized prescriptions
Daily Values are designed to make food labels interpretable across the general population. They are not an individualized diet plan for every age, body size, health condition, or energy need. Someone with kidney disease may have a clinician-set target for potassium or phosphorus; a person with anemia may receive specific advice about iron; athletes may target protein differently. The claim remains legally meaningful, but the personal importance of that nutrient can differ. This is why a regulated positive claim should inform a decision, not make it automatically.
Use the claim as a shortcut, then read the whole panel
A front label can save time when you are specifically seeking calcium, iron, vitamin D, fiber, or another nutrient. Remember the hierarchy: good source is generally 10–19% DV; high, rich in, and excellent source are generally 20% DV or more. Then check the serving size and scan the nutrients you want more of as well as sodium, saturated fat, and added sugars when relevant. That approach preserves what is useful about nutrient-content claims without letting one favorable nutrient stand in for the nutritional quality of the entire food.
Sources
- FDA — Dietary Supplement Labeling Guide: Claims — FDA explanation of 10–19% DV good-source and 20% DV high claims.
- FDA — How to Understand and Use the Nutrition Facts Label — U.S. serving, calories, and Percent Daily Value guidance.