The short version
6 companies supply this market — a reasonable cushion if one runs into trouble. The price has held steady around $0.0964 per unit over the past year. It is in shortage right now — FDA lists the reason as “shortage of an active ingredient”. One of its named manufacturing plants, Zhejiang Huahai Pharmaceutical Co., Ltd., failed FDA inspectionwithin the last two years — the agency’s most serious outcome.
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