FDA warns ZUBB weight-loss supplement contains hidden sildenafil

The study

This is not a research study. It is a public safety notification from the US Food and Drug Administration (FDA), listed under its medication health fraud notifications. The notice is dated 9/4/2026 in its text.

The FDA is advising consumers not to buy or use ZUBB Dietary Supplement. The product is promoted and sold for weight loss on various websites and possibly in some retail stores. The FDA says it was identified during an examination of international mail shipments.

What they found

FDA laboratory analysis confirmed that ZUBB Dietary Supplement contains sildenafil that is not listed on the product label.

The notice describes sildenafil as the active ingredient in Viagra, an FDA-approved prescription drug used to treat erectile dysfunction. It says sildenafil may interact with nitrates found in some prescription drugs, such as nitroglycerin. This may lower blood pressure to dangerous levels.

The FDA says this is especially concerning for people with diabetes, high blood pressure, high cholesterol or heart disease, because they commonly take nitrate-containing medicines.

The FDA asks health care professionals and consumers to report adverse events or side effects linked to this product to its MedWatch Safety Information and Adverse Event Reporting Program. Reports can be made through the online MedWatch voluntary reporting form, or by downloading the form and faxing it to 1-800-FDA-0178.

The notice also gives a general warning. Products sold as dietary supplements or conventional foods may contain hidden ingredients. They are typically promoted for sexual enhancement, weight loss, pain relief and body building, and are often represented as being all natural. The FDA says it is unable to test and identify all such products that may have harmful hidden ingredients.

How much weight to give it

The laboratory finding comes from a regulator and is stated as confirmed. The notice does not report how much sildenafil was found, how many samples were tested, which methods were used or which batches were involved. It does not report any patient harm linked to this product.

The interaction risk is described as a possibility ("may interact", "may lower"). It is not described as a measured outcome in users of ZUBB.

The notice comes from the US. It does not say whether ZUBB is sold in India. The notice names only ZUBB, although it warns in general that other supplements may contain hidden ingredients.

For your clinic

The FDA says the risk is especially concerning for people with diabetes, high blood pressure, high cholesterol or heart disease, who commonly take nitrate-containing medicines. This is a reason to be careful with weight-loss supplements that may contain undeclared drugs.

The FDA advises consumers not to purchase or use ZUBB. It warns that products sold as dietary supplements, often described as "all natural", may contain hidden ingredients, and it urges caution before buying them. Adverse events linked to this product can be reported to the FDA through MedWatch, as the notice requests. Read the full FDA notification and your local regulator's advice before changing any clinic protocol.