Pharmaceutical-grade potassium alum. That's the whole list.
KAl(SO₄)₂ · 12 H₂O · 100% w/w · USP grade
Source: Pharmaceutical-grade potassium alum from a US Pharmacopeia-compliant supplier.
Processing: Milled to a fine consistent powder, batch-tested for purity, weighed and filled into 2 oz aluminum tins.
Facility: Lawrence, Kansas. FDA-registered, cGMP compliant.
Testing: Every production batch is tested for identity, purity, and particle size before release.