At MG Algues, we take pride in our expertise in harvesting a wide range of organic seaweed, allowing us to fully meet the needs of our customers.

Sea harvesting

Laminaria Digitata

( Harvesting period: from April 15th to October 15th )

Harvested in Brittany and processed in-house (drying, milling), this seaweed — also known as Breton kombu — is naturally rich in iodine (up to ~600 mg/kg dry weight), alginates (20–30%) and essential minerals. Its natural mucilage and alginic acid content make it an excellent texturising, hydrating and remineralising agent, suitable for gels, masks, fluid extracts and functional powders. It is also valued in nutrition as a source of marine trace elements; in agriculture for extracts/biostimulants; and in cosmetics as a natural thickener/gelling agent. Formats: flakes or powder (25 kg bags and big bags).

Laminaria hyperborea

(Harvesting period: year-round)

Harvested on rocky bottoms in Brittany, this kelp is distinguished by a more rigid structure and a high alginate content (up to ~35%), yielding very viscous extracts sought after for gelling, thickening and stabilising. A benchmark for the production of food and technical alginates (E401–E405), it is also appreciated in cosmetics for its film-forming effect and texture hold. Uses: agriculture (extract carriers, coating/encapsulation, biostimulants), animal nutrition (fibres and marine minerals for premixes/supplements, in compliance with regulations), cosmetics (baths, masks, marine powders). Formats: flakes, powder, ground stipes (25 kg bags and big bags).

Shoreline seaweed harvesting

Ascophyllum nodosum

(Harvesting period: year-round)

Hand-harvested on the Breton foreshore, then dried and milled in-house, this intertidal brown seaweed naturally concentrates polyphenols, alginic acids and marine trace elements. A reference in agriculture for extracts/biostimulants and soil conditioners, it brings structure and active matter to formulations. In animal nutrition, it serves as a raw material rich in fibres, minerals and iodine for premixes and supplements, in compliance with applicable regulations. In cosmetics, its polyphenol-rich extracts are appreciated for texture hold and the comfort of marine-inspired care. Formats: flakes or powder (25 kg bags and big bags). Organic-certified batches (Ecocert).

Fucus serratus & vesivulosus

(Harvesting period: year-round)

Intertidal brown seaweeds harvested on the Breton foreshore. Naturally rich in phlorotannins (polyphenols), fucoidan and alginic acid, they are excellent bases for extracts and functional powders. Sought after in cosmetics for body and face marine care (film-forming agents, support for texture hold), they are also used in agriculture for biostimulant/conditioner formulations, and in animal nutrition as a raw material rich in fibres, minerals and iodine (in compliance with regulations). Formats: flakes or powder (25 kg bags and big bags). Organic-certified batches (Ecocert).

ULVA

(Harvesting period: year-round)

Green seaweeds harvested on the Brittany coast. Naturally rich in proteins (up to ~30% on a dry-matter basis), amino acids, soluble fibres, chlorophylls and minerals, Ulva also contains ulvans (sulphated polysaccharides) valued in technical formulations. Uses: agriculture (extracts and biostimulants, “green” formulation carriers), animal nutrition (protein and mineral inputs for premixes/supplements, including aquaculture, in compliance with regulations), cosmetics (powders/extracts for masks, gels and cleansing products with a fresh marine signature). Formats: flakes or powder (25 kg bags and big bags). Organic-certified batches (Ecocert).

Himanthalia

(Harvesting period: year-round)

A brown, elongated seaweed harvested on the Brittany coast. Naturally rich in soluble fibres, fucoidan, polyphenols and iodine, it offers an excellent functional profile for food applications: plant-based ingredients, marine condiments, sauce bases and textured matrices. Its powders and extracts provide body, smoothness and a marine signature in formulations. It is also used as a raw material for nutritional supplements (fibres and marine-derived minerals), in compliance with applicable regulations. Formats: flakes or powder (25 kg bags and big bags). Organic-certified batches (Ecocert).

Saccharina lattissima

(Harvesting period: year-round)

Harvested on our Brittany coastline and processed in-house (drying, milling), this kelp is naturally rich in complex carbohydrates (laminarin, mannitol), iodine and alginates. It is valued for texturising, water-binding and the gentle marine character it brings to formulations. Uses: food (sauce bases, textured plant matrices, functional extracts), agriculture/biostimulants (input for extracts and alginates), marine cosmetics (powders and extracts for hydrating, film-forming care). Formats: flakes or powder (25 kg bags and big bags). Organic-certified batches (Ecocert).

Chondrus crispus & mastocarpus

(Harvesting period: from May 1st to October 31st)

A red seaweed harvested on the Brittany coast. Naturally rich in carrageenans (up to ~55%), it is sought after for gelling, thickening and stabilising textures. A reference in food applications (E407) for gelled desserts, sauces and plant-based alternatives, it is also used in cosmetics and pharmacy as a film-forming and structuring agent. Formats: flakes or powder (25 kg bags and big bags). Organic-certified batches (Ecocert).

Palmaria palmata

(Harvesting period: from April 1st to December 31st)

A red seaweed harvested on the Brittany coast. Naturally rich in protein (20–25% DM), essential amino acids, B-group vitamins and marine-derived antioxidants, it brings a characteristic red colour and umami note to formulations. Uses: food (flakes and powders for plant-based ingredients, condiments, protein bases), animal nutrition (protein- and mineral-rich raw material for premixes/supplements, in compliance with regulations), cosmetics (powders/extracts for gentle scrubs, masks and hair care with a marine signature). Formats: flakes, shavings or powder (25 kg bags and big bags). Organic-certified batches (Ecocert).