When taken by mouth: Horny goat weed extract is possibly safe when used short-term. A specific extract of horny goat weed containing phytoestrogens has been taken by mouth safely for up to 2 years. Another extract containing a chemical called icariin has been taken safely for up to 6 months.
But some types of horny goat weed are possibly unsafe when used for a long period of time or in high doses. Serious side effects including severe breathing problems have been reported.
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