[joecool1029]

Are they pure or adulturated with calcium? Most of the caffeine pills I've spotted are not just caffeine and I think this is the chalkiness you would be experiencing.

[valine]

They’re pure as far as I know. Would calcium be listed as an ingredient?

[joecool1029]

Yes should be on the box somewhere, they usually claim to add it to reduce bone loss. Example label: https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=0dbca...

[travisjungroth]

It’s very unlikely they’re pure caffeine. If it’s a pressed pill (versus a capsule) they’re definitely not. It needs binders to hold it together.

[valine]

Gotcha, I take capsules. They’ve got rice powder to add volume I assume, but other than that I think it’s pure caffeine.