Brazilian Scientists Repurpose Industrial Beer Waste into Sustainable Sunscreen Formulations to Enhance UV Protection

USP researchers use spent hops from beer production to create antioxidant-rich sunscreens, proving industrial waste can enhance skin protection and sustainability.

By: AXL Media

Published: Apr 30, 2026, 5:40 AM EDT

Source: Information for this report was sourced from EurekAlert!

Transforming Brewing Byproducts into Skincare Innovation

The vast quantities of waste generated by the global beer industry may soon find a secondary life as a key ingredient in the sun care market. A multidisciplinary study conducted at the University of São Paulo (USP) has revealed that spent hops, or Humulus lupulus L., are a viable source for bioactive compounds in sunscreen formulations. By focusing on materials typically discarded after the brewing process, researchers have identified a sustainable method to utilize leftover polyphenols and bitter acids. This approach not only addresses industrial waste management but also explores the potential for creating more affordable and environmentally conscious cosmetic alternatives.

The Chemical Advantage of Reused Hop Biomass

During beer production, hops are often added during the boiling of the wort or after fermentation in a process known as dry hopping. Because these pellets are rarely exhausted of their chemical properties, a significant fraction of antioxidant rich compounds remains in the discarded biomass. Interestingly, the study found that the spent residue actually outperformed raw, unbrewed hops in terms of photoprotective activity. According to Daniel Pecoraro Demarque of FCF-USP, the brewing process likely eliminates volatile substances that would otherwise dilute the concentration of the necessary chemical bonds required for effective UV protection.

Evaluating Performance in a Laboratory Setting

To test the efficacy of this recycled material, scientists at the Pharmacognosy Laboratory subjected the hop residue to ethanol extraction and subsequent drying. These extracts were then incorporated at a 10 percent concentration into standard sunscreen creams already containing traditional UVA and UVB filters. The research team also experimented with various cosmetic emollients, such as isopropyl myristate and capric-caprylic triglycerides, to determine which combination yielded the highest performance. By integrating these natural byproducts into existing chemical frameworks, the team sought to enhance the overall protective capabilities of the base formulation.