Sugar Kelp’s Promise—and Its Limit

Sugar kelp could help food manufacturers diversify their ingredient base while adding flavor, texture, and potential nutritional value. Realizing that promise, however, will require more than growing the crop. Developers must preserve useful compounds, manage lot-to-lot variability, establish safety specifications, and build an economical processing route.

Grace Collery, senior market development program manager at GreenWave, outlined those opportunities and constraints in “Sugar Kelp as a Climate-Resilient Functional Food Ingredient: New Insights Into Its Wellness and Sensory Potential” at IFT FIRST Annual Event and Expo.

Sugar kelp (Saccharina latissima) is a brown macroalga cultivated in the United States and Canada. It grows in seawater without arable land, freshwater, fertilizer, or feed during grow-out. That profile could make kelp a useful complement to terrestrial crops, although its environmental footprint still depends on farm design, yield, transport, preservation, and processing.

Multiple Functions in One Ingredient

GreenWave commissioned NIZO to review the literature, conduct preliminary extraction tests, and assess processing feasibility. The 2025 scoping study identified six compound classes of interest: the polysaccharides alginate, fucoidan, and laminarin; the pigment fucoxanthin; phlorotannin polyphenols; and omega-3 fatty acids.

For product developers, the immediate opportunity lies in technical performance. Amino acids and minerals can contribute salty and umami notes, giving kelp extracts potential in sodium-reduction work. Alginate is already used for stabilization and emulsification, while other polysaccharides provide gelling and water-binding properties. A single ingredient stream could therefore contribute flavor and texture while carrying compounds under study for possible health effects.

That combination is commercially attractive, but the health evidence is uneven. Some findings have clinical support; others come from animal or in vitro research. “But overall, more research is needed to make any specific claims,” Collery said. The scoping work was not a finished-product trial or human intervention study, so developers should separate demonstrated technical functionality from potential physiological benefits.

Processing Determines What Survives

Composition can shift with geography, season, growing conditions, harvest timing, and processing. Suppliers therefore need specifications tied to the intended application, not merely a species name.

NIZO’s preliminary tests also identified processing risks. Mechanical cell-wall disruption can release enzymes that degrade target compounds. Polyphenol-protein complexes may form and become difficult to separate. Heat can cause polysaccharides to gel, proteins to denature, and sensitive compounds to degrade. The extraction and stabilization process must be designed around the compounds a developer wants to retain.

Fresh kelp’s high moisture content adds an economic barrier. Collery said drying can be cost-prohibitive, which increases interest in alternative preservation and fractionation methods. A biorefinery could produce several ingredient streams from the same biomass, spread processing costs, and apply different conditions to sensitive compounds. It also adds scale-up work before the ingredients are ready for routine formulation.

Safety Specifications Set the Inclusion Rate

Because kelp takes up minerals from seawater, suppliers must characterize iodine and potentially toxic elements such as inorganic arsenic, cadmium, lead, and mercury. Specifications should also address microbiological hazards and possible shellfish cross-contact.

Iodine illustrates the formulation trade-off. It is an essential nutrient, but its concentration can vary widely by species and lot. Inclusion rates must be based on analytical results rather than an assumed average. Regional and seasonal variability can affect both the safe use level and the yield of desirable compounds.

From Potential to Commercial Ingredient

The next research steps include human intervention studies on prebiotic and metabolic effects, along with work on bioavailability, digestibility, and species-specific processing. Commercial progress will also depend on reproducible composition, economical stabilization, validated performance, and evidence appropriate to any proposed claim.

Sugar kelp is therefore more than a sustainability story, but it is not yet a plug-and-play multifunctional ingredient. Its value to food companies will be determined by whether the supply chain can deliver consistent, safe ingredients whose technical benefits survive processing at commercial scale.

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