The short version
4 companies supply this market — a reasonable cushion if one runs into trouble. The price has held steady around $0.0909 per mL over the past year. It is in shortage right now — FDA lists the reason as “shortage of an inactive ingredient component”. Put together: worth watching — several of the pressures that precede supply trouble are present at once.
The numbers behind every sentence are on this page below — and the Watch button emails you when any of them move.