Mineral amount vs mineral-source weight

This check covers US labels. Start with the exact package and variant you have, then use the steps below. Explore more supplements checks.

What to look at

1. Find the nutrient row in Supplement Facts.
2. Read the source in parentheses.
3. Use the declared amount for label comparison, not a guessed compound conversion.

A little practice

Read this label.

Calcium (as calcium carbonate): 200 mg

Illustrative excerpt · not a real product

Why this reading matters

Read the serving basis before the ingredient amounts. A mineral source can be named beside the nutrient; botanical plant parts and proprietary blends carry additional information that a headline number can hide. US Food and Drug Administration.

What the label cannot settle

This does not compare absorption or recommend a mineral dose.

Put the check to work

Compare the exact words and amounts on your package with the example. If a panel is missing, a photo is unreadable or the manufacturer has not disclosed a detail, keep that detail as unknown. A different flavor, shade or formulation needs its own check.

For names used in this check, read calcium carbonate. For the full reading method, use our supplements label guide. The medicines and supplements guide adds context for your needs.

A useful next check

• Reading the plant part in a botanical supplement
• What Daily Value not established means
• Reading the serving size on gummy supplements

Sources read and this label example reviewed on 2026-09-23. Examples are illustrative, not product tests or clinical reviews.