The gaps in this subsection determine whether seaweed-based foods can be reliably optimized for the nutritional performance, safety, and consistency required to compete with and displace high-emission terrestrial proteins, the mechanism through which this pathway avoids carbon dioxide emissions at scale.

Strain Development and Composition

Food production depends on a narrow range of species whose nutritional profiles are highly variable and poorly characterized

Five genera account for much of the seaweed food market, yet within these, the compounds most responsible for nutritional performance — proteins, essential amino acids, bioactive compounds — vary substantially by species, season, cultivation site, and harvest timing. Genomic and phenotypic diversity across the full range of potentially edible species remains largely unmapped. Investment in systematic species/strain and site selection criteria, like integrating genotype-phenotype mapping specific to environmental factors (e.g., light, nutrient availability, temperature), would enable the ability to optimize strains for specific food applications such as protein substitutes or functional ingredients (González-Mesa et al., 2023).

The specific compounds responsible for product performance are not reliably measured or tracked across the production chain

Active compounds in seaweed (including proteins, polysaccharides, pigments, and bioactives) are degraded or transformed at multiple processing stages, and the relationship between feedstock composition and final product quality is not well understood. Without robust methods to measure and track composition from cultivation through to finished product, producers cannot reliably deliver consistent nutritional claims or respond to regulatory requirements. Standardized protocols need to be developed to monitor the nutritional composition of seaweed throughout the production chain, including but not limited to techniques like ‘omics approaches (e.g., genomics, transcriptomics, metabolomics) to identify candidate genes and compositional profiles, and high-performance liquid chromatography or mass spectrometry to track compound degradation (Dumilag et al., 2023).

Public health

Risks from contaminants in seaweed-based food products are not yet fully characterized, creating uncertainty in exposure risks for consumers

Consuming seaweed can expose people to microorganisms, heavy metals (e.g., lead, arsenic, mercury, cadmium), iodine, and marine biotoxins (Edenyi et al., 2024). The FAO-WHO notes a general absence of intake data sufficient to assess hazards at regional or national level — a gap that is especially acute for novel markets where consumption patterns cannot be inferred from traditional use (FAO, 2022, 2024). To improve the understanding of public health risks, large-scale, region-specific studies should be conducted to monitor contaminants in seaweed, with a particular focus on areas with high industrial or agricultural runoff. Developing standardized testing for contaminants such as heavy metals, marine biotoxins, and iodine alongside region-specific exposure assessments will be critical to ensuring the inclusive safety of seaweed-based food products (Good Food Institute, 2022).

Nutrition claims for seaweed-based blue foods are insufficiently supported by clinical evidence, limiting regulatory approval and consumer trust

Seaweed can rival conventional foods in protein and essential amino acids (e.g., Palmaria palmata vs. chicken and beef), but most evidence is compositional, not clinical, so bioavailability and health outcomes remain unproven and limit its acceptance as a nutritional source in the eyes of regulators, emerging markets, and consumers (Idenyi et al., 2024; Naseem et al., 2024). Coordinated clinical trials that assess the bioavailability and digestibility of key compounds, such as proteins and amino acids, are needed. These studies should also investigate the long-term health outcomes of consuming seaweed, such as its effects on metabolic health, immune function, and gut microbiota.

The gaps in this subsection determine the processing carbon intensity of seaweed food products: for example, post-harvest drying is the single largest contributor to the product lifecycle footprint, and until lower-carbon alternatives are commercially viable, the net climate benefit of replacing terrestrial protein with seaweed-derived food is materially reduced,

Low-energy extraction methods capable of delivering commercial-scale yields and consistent quality remain at early development stages

Novel extraction technologies offer improved compound yields, lower heat damage, and reduced solvent use compared to conventional thermal methods; however, all are currently at laboratory or pilot scale (Stedt et al., 2022; Suarez Garcia et al., 2023). Targeted R&D investment to bring the most promising low-energy extraction methods from laboratory to pilot and commercial scale — paired with investment in seaweed-specific enzyme development — would reduce the carbon cost of processing and improve the consistency of product composition (Stévant & Rebours, 2021).

Drying and stabilization remain the largest contributors to the carbon footprint of seaweed-based food products

High seaweed moisture makes it heavy, perishable, and costly to transport. Stabilizing it typically requires energy-intensive drying, which often dominates lifecycle greenhouse gas emissions (e.g., Nilsson et al., 2022). Lower-carbon options (e.g., fermentation and non-thermal stabilization) can extend shelf life and improve digestibility, but they remain early-stage and currently costlier and less scalable than thermal drying (Stévant & Rebours, 2021; ARPA-E, 2025). Pairing drying with co-located renewable energy and accelerating commercialization of fermentation and non-thermal methods could cut processing emissions and strengthen the climate case for seaweed-based foods.

Seaweed-based food products do not yet consistently match conventional alternatives on taste, texture, and digestibility — the primary acceptance barriers in novel markets

Seaweed-based substitutes need better flavor masking, texture modification, and digestibility to win consumers outside traditional markets. Trials are mixed: for example, seaweed pasta/noodles can improve nutrition but often have unacceptable color and higher cooking loss; higher inclusions (≥30%) may improve nutrition composition yet show variable digestibility linked to individual gut microbiomes and texture modification (Ainsa et al., 2022; Sultana et al., 2024). Expanded R&D in sensory science, process optimization, and structured consumer trials is needed to identify formulations that can compete with conventional products on taste, texture, and price in emerging markets (Idenyi et al., 2024).

Non-standardized quality control throughout the production chain creates food safety uncertainty and depresses market confidence

Batch-to-batch variability in seaweed contaminants, nutrition, and sensory qualities—driven by farm, season, and processing differences—makes consistent safety and quality assessment difficult, especially in multi-ingredient foods. Without seaweed-specific quality control methods (contaminant testing, shelf-life validation, and composition verification), producers cannot reliably certify products to food safety standards, limiting entry into regulated markets (Idenyi et al., 2024). Coordinated development and adoption of seaweed-tailored standards, involving producers, regulators, and third-party certifiers, would improve consistency and enable market expansion.

Industrial extraction and processing of seaweed blue food products generates significant waste streams that are not yet responsibly managed at scale

Conventional extraction of target compounds — alginates, proteins, bioactives — from seaweed biomass produces substantial liquid effluents and residual fractions that may contain polysaccharides, pigments, and salts (Ozogul et al., 2024). At pilot scale, these byproducts are manageable; at commercial scale, irresponsible disposal risks contributing to water quality degradation and local ecosystem impacts. Cascading biorefinery approaches could substantially reduce waste while improving the economics of processing but are not yet integrated into most food production systems. Integrating cascading biorefinery design into processing facilities would reduce environmental risk while improving cost competitiveness through co-product revenue streams.

The gaps in this subsection determine whether investors can make a credible, regionally grounded case for scaling seaweed food production — without comparable LCA data across major producing regions, the emissions avoided per ton of terrestrial protein displaced remain difficult to quantify and the investment case cannot be made with confidence.

The economic case for seaweed blue food investment cannot yet be made with confidence because lifecycle and socio-economic data from high-production regions is scarce

Existing lifecycle analyses of seaweed foods focus on a few species and mostly Global North settings, and rarely compare seaweed products directly with the animal- or plant-based foods they aim to replace (Waqas et al., 2024; Eikenbusch et al., 2026). This creates a major evidence gap: decisions about scaling production—especially in Southeast Asia and the Global South—are being based on data from costly, low-volume northern operations that may not reflect tropical systems’ costs or emissions. Expanding LCAs across key species and major producing regions, using standardized methods and including full end-to-end emissions alongside cost and socio-economic analysis, would support better-targeted investment.

Consumer acceptance

Seaweed-based blue food products carry a significant price premium over conventional competitors that most consumers in novel markets are unwilling to pay

Most new consumers won’t pay a premium for seaweed substitutes, preferring standard or discounted prices (Pandey et al., 2026). Seaweed protein can compete with animal proteins, but it struggles against cheap, mature plant alternatives like soy and pea. Until processing costs drop and production scales, seaweed foods will remain niche premium products. Clear, credible pathways to cost reduction—supported by processing innovation, scale-up, and early anchor procurement commitments from manufacturers willing to absorb a temporary premium for carbon credentials—could create the demand pull needed to justify investment.

New consumers will be slow to adopt seaweed-based foods without concerted marketing strategies to increase awareness and understanding

Outside East Asia and a few traditional regions in Europe and North America, seaweed foods are novel and must compete with entrenched products and well-funded plant-protein brands. Consumer acceptance depends on awareness of nutritional benefits and competitive taste, texture, and palatability. Targeted market development—combining independent nutrition communication, recipe development, and sampling—paired with visible environmental certification and partnerships with food scientists, health communicators, and cultural intermediaries can convert tentative interest into reliable demand signals that justify production investment (Pandey et al., 2026).

The gaps in this subsection determine whether seaweed-based foods can access the regulated markets needed to achieve the production volumes required for meaningful emission displacement — without harmonized food safety standards, seaweed foods face high compliance costs and slower market entry than established plant-based alternatives.

Seaweed is excluded from or inadequately represented in food safety regulations in most novel markets, creating uncertainty for producers and buyers

Seaweed’s regulatory status as a food ingredient varies substantially across jurisdictions. In markets where seaweed lacks cultural familiarity and existing regulatory precedent, these requirements extend time-to-market significantly and create an uneven competitive environment relative to established plant-based alternatives that benefit from existing food safety frameworks (Cottier-Cook et al., 2023; Camarena Gómez & Lähteenmäki-Uutela, 2024). Seaweed-specific food safety classifications — developed through collaboration between national food safety authorities and supported by FAO harmonization efforts — would reduce regulatory uncertainty, shorten approval timelines, and allow producers to enter novel markets with greater confidence.

The absence of internationally harmonized standards for seaweed food safety and labelling restricts cross-border trade and limits market access

Seaweed exporters face inconsistent rules across countries—labelling requirements, approved species lists, and maximum residue limits for iodine, heavy metals, and marine biotoxins—based on differing consumption assumptions (FAO, 2024; Ozogul et al., 2024). These discrepancies raise compliance costs, hinder consistent cross-market nutrition claims, and incentivize production to the least stringent standard. Without international reference standards, seaweed foods are disadvantaged versus conventional products supported by Codex frameworks. Codex-aligned standards for contaminant limits, composition claims, and labelling—focused on high-priority species and markets—would reduce trade barriers and level competition.