Even "clean" versions of these formulas—often containing L-arginine or Tribulus—can cause side effects: Stamina Products Customer Care
: Combining these products with nitrates can cause a life-threatening drop in blood pressure.
The has historically issued major safety alerts and nationwide recalls for products in this category.
: Because they contain prescription-strength drugs while being marketed as "all-natural" supplements, the FDA has classified them as unapproved new drugs. Availability and Purchasing Cautions
: Lab analysis found that these products often contained benzamidenafil or tadalafil —active pharmaceutical ingredients found in FDA-approved drugs for erectile dysfunction (like Cialis or Viagra) but not declared on the supplement label.
While some websites claim to sell "original" formulas, health experts and regulatory bodies urge extreme caution: