On March 27, 2014 Nova Products Inc of Aston, Pennsylvania issued a nationwide recall of several lots of its natural supplements: African Black Ant (Lot# 2006-000926), Black Ant (Lot# 2006-3627878), XZen Gold (Lot# 130310GL), ZXen Platinum (Lot# 130520PL), XZen 1200 (Lot# 13051012), XZone Gold (Lot# 131110GL), and XZone 1200 (Lot# 13071012). The FDA have determined that the above products contain undeclared amounts of sildenafil and tadalafil, active ingredients used in FDA-approved ED medications.
The drug ingredients found in these natural supplements can interact with nitrates found in some prescription drugs (such as nitroglycerin), resulting in decreased blood pressure.
Additionally, these products may cause side effects such as headaches and flushing.
For more information, please read the original FDA alert.