Health Canada has suspended the licence of Filix Mas, a homeopathic product, because it contains the ingredient male fern ( Dryopteris filix-mas ). Safety information has raised potential concerns regarding effects of the specific ingredient at higher doses, and as such consumers should stop using the affected product immediately as it may pose a serious health risk. On April 2, 2015, Health Canada suspended the licences of two natural health products containing male fern.