Circular approach for the sustainable valorization of IMTA Codium sp. for multitarget skin care applications

## Our Take: Unlocking Ocean Intelligence for Sustainable Beauty – The Codium Connection

The pursuit of sustainable and ethically sourced ingredients for the cosmetics industry is rapidly gaining momentum, driven by consumer demand and a growing awareness of environmental impact. This recent study, detailing the valorization of *Codium sp.* seaweed cultivated within an integrated multitrophic aquaculture (IMTA) system, represents a significant advancement in that direction. IMTA, as a system, inherently reduces environmental impact by integrating different aquaculture species, leveraging waste streams and minimizing nutrient pollution – a critical consideration for ocean health. This research builds upon the broader exploration of marine bioresources, exemplified by previous work on algal polysaccharides for cosmetic applications Marine Algae for Cosmetics and the increasing interest in harnessing ocean-derived compounds for their bioactive properties. The innovative approach of extracting and analyzing fractions based on polarity, coupled with rigorous *in vitro* testing against various cellular targets, offers a robust framework for identifying and characterizing valuable ingredients. The fact that the extraction process adheres to European Union cosmetic regulations further strengthens the potential for real-world application and reinforces the study’s credibility. Furthermore, the concurrent valorization of the post-extraction biomass into biochar demonstrates a commitment to resource efficiency, minimizing waste and maximizing the economic viability of the process.

The findings themselves are compelling. The identification of specific fractions (F1, F3, and F5) exhibiting potent photoprotective and wound-healing activities immediately highlights their potential for inclusion in skincare formulations. The antimicrobial activity against *Cutibacterium acnes*, a key contributor to acne development, is particularly noteworthy, offering a natural alternative to synthetic antimicrobials often found in cosmetic products. This aligns with a growing trend toward “clean beauty” and a preference for ingredients with minimal potential for adverse reactions. The exploration of different biochar production methods – conventional pyrolysis, hydrothermal carbonization, and acid-mediated carbonization – and the observation of lower ash content in the innovative routes speaks to the optimization potential and the possibility of creating high-quality activated carbons or biomaterial scaffolds. The study’s focus on *in vitro* analysis, while valuable for initial screening, also underscores the need for future *in vivo* studies to validate these findings and assess the efficacy and safety of these extracts in human skin. Understanding the mechanism of action, particularly regarding the membrane potential disturbance observed with fractions F2 and F3, would also be beneficial for targeted formulation development. For those interested in a broader overview of sustainable aquaculture practices, this article provides excellent context FAO Aquaculture.

The significance of this research extends beyond the immediate application to skincare. It exemplifies a broader shift towards a circular economy model within the aquaculture sector, where waste streams are viewed as valuable resources rather than byproducts. By integrating seaweed cultivation within IMTA systems and subsequently valorizing both the extractable compounds and the remaining biomass, this study demonstrates the potential for creating sustainable, high-value products while minimizing environmental impact. The use of *Codium sp.*, a readily cultivable and fast-growing seaweed species, further enhances the scalability and economic feasibility of this approach. The demonstrated versatility of the biochar produced – its potential as activated carbon precursor or biomaterial scaffold – offers a pathway for diversification and increased revenue streams for aquaculture operations. This research provides a compelling case study for the application of ocean intelligence—the ability to extract and utilize valuable resources from the marine environment in a sustainable and responsible manner—and could inspire similar approaches for other marine resources.

Looking ahead, the key question is how these promising *in vitro* results can be translated into commercially viable and clinically proven skincare products. Scaling up the cultivation of *Codium sp.* within IMTA systems to meet potential demand will require careful consideration of logistical and economic factors. Furthermore, continued research into the specific bioactive compounds responsible for these observed effects, and their potential synergies within formulations, will be crucial for maximizing efficacy and ensuring consumer safety. The convergence of aquaculture innovation, sustainable ingredient sourcing, and advanced materials science highlighted by this study presents a compelling opportunity to reshape the beauty industry and contribute to a more sustainable future for our oceans.