Tsumura & Co., the nation’s largest producer of Chinese herbal medicines, announced Wednesday a voluntary recall of 17,000 boxes of its cold-fighting Kakkonto herbal drink following the discovery of a glass shard in one container last week.

The boxes targeted for recall were shipped between Feb. 14 and Tuesday.

A glass fragment 2 mm long was found inside the container on April 19 at a pharmacy in Osaka. The glass might have got inside the container during the manufacturing process, the company said.

The product was made in January by a Toyama-based pharmaceutical maker. Each box holds three containers.

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