Glossary
USP grade chalk
Magnesium carbonate that meets a United States Pharmacopeia monograph.
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USP is a real standard for drug and ingredient quality. A powder can be sold as USP magnesium carbonate. That speaks to identity and purity tests in the monograph. It does not mean a sports bottle was lab-tested for grip, and it does not mean every "pure" or "lab grade" claim on Amazon is a USP claim.
None of the listings summarized on this site were labeled USP in the text that was readable on November 15, 2026. If a bottle matters for a meet drug-testing context, ask the federation what they actually test. Chalk rules and anti-doping rules are not the same document.
Black Diamond White Gold loose chalk
Loose chalk. The title says 100% magnesium carbonate, in a loose or refillable format.
This is powder. Gyms that ban dry chalk are talking about this category. It is the comparison piece next to a liquid bottle, not a liquid itself.
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