EG Labs, LLC, voluntarily recalled, nationwide, all lots of its supplement product sold under the brand name, Viapro, in 375mg capsules. EG Labs, LLC. conducted this recall after being informed by representatives of the Food and Drug Administration (FDA) that lab analysis by FDA of a sample from one lot of the product revealed that it contained a potentially harmful undeclared ingredient, thio-methisosildenafil. FDA asserts that this ingredient is an analog of sildenafil. Sildenafil is the active chemical ingredient of an FDA-approved drug used for Erectile Dysfunction (ED) in men to enhance sexual performance. The use of undeclared chemicals pose a threat to consumers because they may harmfully interact with nitrates found in some prescription drugs (such as nitroglycerin) and may lower blood pressure to dangerous levels. Consumers with diabetes, high blood pressure, high cholesterol, or heart disease often take such nitrates. Viapro capsules were sold in retail outlets nationwide and were packaged into 2-capsule blister, 1 capsule blister and 10 capsule bottles.