A batch number the manufacturer confirms is genuine when you call to check.
Membership unseals all 165 graded entries, the ten checks in order, and the complete online reader for all four books.
Entry S-161 of 165 in Industry Dirty Secrets, the supply-chain case file. Every entry is graded documented, corroborated, or retired as folklore — 22 of the 165 are published as folklore rather than quietly dropped. This file grades a seller's claim; it cannot tell you what is in a vial.