The short version
Just 2 companies supply this market — thin enough that a single exit would be felt immediately. The price has jumped 136% in a year, to $182.55 per mL — sharp rises like this often mean supply is already tightening. It is in shortage right now — FDA lists the reason as “other”. Put together: this is a fragile supply — if anything else goes wrong, there is very little slack to absorb it.
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