In the Antarctic waters at the southernmost tip of the Earth lives a small crustacean, Antarctic krill, which measures only 3–5 cm long. With a biomass of hundreds of millions of tonnes, it is among the largest multicellular animal populations on Earth. Dubbed the “marine gold mine” by the industry, it is also recognised as a highly promising marine protein resource bank.

A report published by People’s Daily on 13 February 2026 states that driven by scientific and technological innovation, Antarctic krill has been upgraded from a traditional raw material for aquafeed to a high-value marine nutrition ingredient. Antarctic krill oil has already become a popular ingredient within the marine nutrition sector. As an emerging marine bioactive peptide obtained from intensive processing of krill, Antarctic krill peptides are emerging as a new focal point for industrial research and commercialisation.

This article offers an industrial popular-science interpretation covering raw material technological evolution, core nutritional composition, research priorities, product development applications, and formulation concepts combining “krill peptides + krill oil”.

PART 01

From “Marine Gold Mine” to Molecular Nutrition Ingredient: Technological Development of Antarctic Krill Peptides Antarctic krill (Euphausia superba) inhabits the cold waters of the Southern Ocean. Feeding on phytoplankton, it sits at the bottom of the marine food chain. Naturally enriched with high-quality protein, Omega‑3, phospholipids, astaxanthin and a variety of minerals, it is a precious marine resource endowed by nature.

A 2026 review article in the Journal of Fisheries of China notes that krill protein is high-quality protein with a balanced amino acid profile. Its proportion of essential amino acids satisfies the protein assessment criteria set by WHO/FAO/UNU. It contains all eight essential amino acids required by the human body, and its amino acid ratio closely matches human protein requirements.

In the early stage, most Antarctic krill was processed into krill meal for aquaculture and livestock feed. With continuous advances in extraction and separation technologies, Antarctic krill oil was the first to achieve industrialisation and became an important category within the Omega‑3 raw material market.

Antarctic krill peptides are a further high-value processed product derived from krill resources. Using defatted krill meal as raw material, bioenzymatic hydrolysis breaks down large protein molecules into peptide fragments composed of 2–10 amino acids, with molecular weight predominantly in the range of 200–1000 Daltons.

Relevant studies in Science and Technology of Food Industry indicate that alkaline protease is a commonly used enzyme for preparing Antarctic krill peptides. Krill peptides with a high degree of hydrolysis can be obtained by optimising enzymatic hydrolysis parameters.

Today, Antarctic krill peptides have moved beyond laboratory bench trials and gradually advanced to industrial pilot production and raw material development, becoming a new contender in the marine bioactive peptide market.

PART 02

Antarctic Krill — A Treasure Trove: Analysis of Basic Nutritional Components Antarctic krill earns the nickname “marine gold mine” due to its diverse nutritional portfolio:

✦ 1. High-quality Protein Antarctic krill protein content can reach 60%–70%. As a premium marine protein source, it contains all eight human essential amino acids, with notably high levels of lysine and methionine. According to China Popular Science, Antarctic krill is high in protein, low in fat and rich in minerals. It also contains more than ten non-essential amino acids and is abundant in glutamic acid.

✦ 2. Phospholipid-bound Omega‑3 Krill lipid content is approximately 15%–25% on a wet-weight basis. Phospholipids account for 30%–50% of total lipids, mainly phosphatidylcholine (PC) and phosphatidylethanolamine (PE). Unlike fish oil Omega‑3, which mostly exists in triglyceride form, EPA and DHA in krill oil are largely bound to phospholipids. A 2025 review in the Journal of Chinese Institute of Food Science and Technology mentions that phospholipid-form Omega‑3 possesses molecular structural features distinct from fish oil. Experts from the China Overseas Fisheries Association explain that phospholipid-bound Omega‑3 participates in cell membrane formation and represents a noteworthy lipid research direction.

✦ 3. Natural Astaxanthin The reddish colour of krill meat and shells comes from natural astaxanthin, a carotenoid with strong antioxidant activity demonstrated in in-vitro research. A January 2026 report from People’s Daily states that natural astaxanthin in krill oil helps slow the oxidation of unsaturated fatty acids during production and storage and reduces the generation of lipid peroxides.

✦ 4. Phospholipid-bound Choline Choline in krill oil is bound to phosphatidylcholine molecules, differing from free choline. The China Overseas Fisheries Association cites public trial data: 47 athletes supplemented with krill oil daily for 5 weeks, and the trial observed a correlation between krill oil intake and in-vivo choline levels. Choline serves as a building block for the neurotransmitter acetylcholine and is an essential nutrient for humans.

✦ 5. Minerals and Trace Elements Public materials from China Popular Science show Antarctic krill is a source of potassium and zinc, alongside trace elements including selenium. Selenium participates in the synthesis of antioxidant enzymes in the human body and is an essential trace element to maintain normal bodily functions.

✦ 6. Fat-soluble Vitamins Krill oil contains vitamin A and vitamin E. Vitamin E works synergistically with astaxanthin for antioxidant effects; vitamin A supports vision and epithelial tissue maintenance.

In short, both protein and lipid fractions of Antarctic krill hold development value. Antarctic krill peptides and Antarctic krill oil constitute the two major high-value development pathways for krill resources.

PART 03

Five Key Features of Antarctic Krill Peptide Raw Material As an emerging marine enzymatically hydrolysed peptide ingredient, Antarctic krill peptides have unique molecular and raw material attributes: Feature 1: Small-molecule Peptide Structure Krill peptides feature molecular weights concentrated at 200–1000 Daltons, mostly oligopeptide fragments. Modern nutritional research confirms small oligopeptides are one of the forms of protein absorbed by the human body. They can be absorbed through the intestinal PEPT1 transporter without complete breakdown into free amino acids, delivering absorption characteristics different from intact large-molecule proteins.

Feature 2: Complete Amino Acid Profile Krill peptides contain 18 amino acids, including all eight essential amino acids. Its amino acid spectrum aligns with the FAO/WHO reference model for high-quality protein. Under enzymatic hydrolysis, some lipophilic substances are retained, enabling the peptide raw material to contain both protein fractions and minor lipid active substances.

Feature 3: Extensive In-vitro Research Directions A review published by PMC in 2024 describes that Antarctic krill protein hydrolysates (AkBPs) display multiple potential bioactivities observed in in-vitro cell experiments; bioactivity correlates with the amino acid sequences and spatial structures of peptide fragments.

⚠️ Important Disclaimer: All findings below are laboratory results from in-vitro and cell-level studies. They have not undergone sufficient human clinical validation. These represent only research exploration and do not equate to corresponding physiological effects upon consumption.

• In-vitro Antioxidant Research: Researchers isolated multiple peptide fragments from krill hydrolysates capable of scavenging DPPH and hydroxyl radicals under in-vitro conditions.
• In-vitro Enzyme Inhibition Screening: Peptide sequences that inhibit ACE and DPP‑IV activity were identified under laboratory settings.
• Other In-vitro Tests: Researchers also found peptide fragments interacting with xanthine oxidase and alcohol dehydrogenase. Teams from China Pharmaceutical University screened multiple polypeptide sequences via genomic and transcriptomic analysis; all work remains at the fundamental research stage.

Feature 4: Relatively Clean Raw Material Source China Popular Science notes Antarctic krill inhabits the Southern Ocean far from industrial pollution. Its short food chain lowers the risk of bioaccumulation of heavy metals and other contaminants, making it a marine protein raw material with favourable safety performance.

Feature 5: Abundant Reserves for Sustainable Development A 2024 report from Xinhua News Agency states Antarctic krill has a biomass of hundreds of millions of tonnes. Under regulated fishing quotas, it boasts tremendous development potential and guarantees raw material supply for the krill peptide industry.

PART 04

Industrial Development Directions for Antarctic Krill Peptides (Raw material development perspective, not product efficacy claims) Based on the physicochemical properties and existing research findings of krill peptides, the industry carries out formulation R&D for the following tracks. These do not represent end-product efficacy:

◆ Development of marine composite nutrition formulations: Utilise the complete amino acid spectrum of peptides and compound with phospholipid-bound Omega‑3 to explore composite protein + lipid nutritional ingredients.

◆ Antioxidant formulation research: Build on in-vitro antioxidant research to conduct formulation trials combined with astaxanthin and vitamin E.

◆ Raw material development for sports nutrition foods: Leverage the rapid absorption of small-molecule peptides as a protein source for sports nutrition products to supply amino acids post-exercise.

◆ Exploratory formulation research related to metabolism: Based on in-vitro enzyme screening results, academia continues cell and animal basic research to accumulate data for future formulation development.

◆ Gut-related raw material research: Partial in-vitro experiments suggest krill peptides have potential to regulate gut microbiota and inhibit bacteria, serving as R&D reserves for gut nutrition ingredients.

All the above fall within industrial R&D directions and do not equal the efficacy of finished food products.

PART 05

Application Forms and Scenarios of Antarctic Krill Peptides Krill peptides have good water solubility, acid and alkali resistance, thermal stability, and stable physicochemical properties under simulated gastrointestinal environments, suitable for developing a wide range of food dosage forms:

◆ Solid Beverages: Excellent solubility. Can be used alone or compounded with other peptides, vitamins and minerals for solid beverage development. Industry reference dosage: 3–5 g/day, adjustable according to product positioning and national regulatory requirements.

◆ Hard Capsules: Good powder flowability, suitable for hard capsule filling for premium dietary supplements. May also be paired with krill oil softgels to create “peptide + oil” bundle sets.

◆ Oral Liquids: Stable in aqueous solution for oral liquid products. Fruit juice or honey can be added to adjust flavour and mask inherent seafood taste.

◆ Functional Gummies and Baked Foods: Its thermal stability suits processing for gummies, energy bars, biscuits and similar products. Natural astaxanthin gives finished products a pale red colour, which is inherent to the raw material.

◆ Raw Material for Special Dietary Foods: Balanced amino acids and easy digestibility make it a protein candidate for sports nutrition foods, senior nutritional foods and other special dietary foods.

PART 06

Who May Consider Foods Containing Antarctic Krill Peptides? Notice: Krill is a crustacean marine organism; people with seafood allergies must avoid it. Pregnant women, lactating mothers, infants and individuals with chronic diseases are advised to consult physicians or dietitians before consuming any novel food. This section only describes the suitability of this protein raw material for different groups and does not imply improvement of diseases or biomarkers.

Middle-aged and Elderly Groups As ageing progresses, human digestive function declines and muscle protein loss accelerates. Small-molecule peptide protein places less burden on the gastrointestinal tract and can serve as a high-quality protein supplement source.

Sports & Fitness Enthusiasts Sports populations require higher protein intake than the general public. The International Society of Sports Nutrition recommends 1.4–2.0 g of protein per kg of body weight daily for active individuals. Krill peptides deliver amino acids rapidly and work well as a protein raw material for sports nutrition foods.

High-stress Office Workers For those with irregular meals and frequent late nights, peptide-based foods offer a convenient way to supplement marine-sourced protein.

People with Weak Gastrointestinal Digestion Compared with intact large protein molecules, small-molecule peptides do not require full breakdown and can be absorbed directly, serving as an alternative protein supplement.