Undeclared Drug Found in Natures Valley Collagen Tablets

Australia's TGA issues urgent warning about potential health risks

Apr. 12, 2026 at 10:08am by

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An extreme close-up X-ray photograph revealing the internal structure of a collagen supplement capsule, with the ghostly, glowing outline of the undeclared drug sildenafil visible against a dark background, conceptually illustrating the health risks of contaminated dietary supplements.An X-ray image of a collagen supplement capsule exposes the hidden presence of an undeclared drug, underscoring the potential health risks associated with tainted over-the-counter products.San Francisco Today

Australia's Therapeutic Goods Administration (TGA) has discovered that Natures Valley Collagen Builder tablets contain an undeclared drug, sildenafil, which can cause serious side effects when taken without medical supervision, especially for those with pre-existing health conditions.

Why it matters

The discovery of sildenafil in these over-the-counter supplements is alarming, as it can interact dangerously with common prescription medications like nitrates. Patients with diabetes, high blood pressure, high cholesterol, or heart disease may be at a higher risk of experiencing adverse effects if they unknowingly consume these tainted products.

The details

The TGA's investigation revealed that the Natures Valley Collagen Builder tablets contain a significant amount of sildenafil, a prescription-only medication in Australia. Sildenafil is typically used to treat erectile dysfunction, but it can also cause serious side effects when taken without medical supervision, such as dangerously low blood pressure.

  • The TGA issued the alert on April 12, 2026.

The players

Therapeutic Goods Administration (TGA)

Australia's regulatory body responsible for evaluating the safety and quality of therapeutic goods, including medicines and medical devices.

Natures Valley

The company that manufactures the Collagen Builder tablets found to contain the undeclared drug sildenafil.

Robyn Langham

The chief medical officer of the TGA, who issued a strong warning to Australian consumers about the potential dangers of the tainted Natures Valley supplements.

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What they’re saying

“We must not let individuals continue to damage private property in San Francisco.”

— Robert Jenkins, San Francisco resident

“Fifty years is such an accomplishment in San Francisco, especially with the way the city has changed over the years.”

— Gordon Edgar, grocery employee

What’s next

Consumers are advised to stop using Natures Valley Collagen Builder tablets immediately and return the remaining tablets to a pharmacy for safe disposal. Individuals who have recently purchased these supplements are encouraged to consult their healthcare providers to discuss any concerns and explore alternative options for managing their health and wellness goals.

The takeaway

This incident highlights the importance of closely regulating the supplement industry to ensure consumer safety, as even well-known brands can sometimes contain undeclared and potentially dangerous ingredients. It serves as a reminder for people to be cautious when taking any over-the-counter health products and to always consult with a medical professional before use.