When it comes to male enhancement, there are a lot of products that claim to provide results naturally. However, use caution before taking any pill for sexual performance, as these assertions of “natural ingredients” can often be exaggerated.

For example, the Food and Drug Administration recently issued a warning against the male enhancement product Man Up. The pills are marketed as an “all-natural” treatment. However, officials said that they found the supplements to contain a variation of the active drug ingredient found in some ED medications.

The ingredient, sulfoaildenafil, has been shown to cause a dangerous drop in blood pressure in some men, according to the FDA. Additionally, it may cause harmful interactions with other prescription medications. While the agency has not yet issued a full recall, officials warned men to stop taking the product immediately.

The warning comes just one week after the FDA forced a recall of the erectile dysfunction treatment Duro Extend, which was found to contain the same ingredient. It too was marketed as a natural cure for erectile dysfunction.