# Shark Liver Oil Alkylglycerols

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/shark-liver-oil-alkylglycerols
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-25
**Evidence Score:** 2 / 10
**Category:** Protein
**Also Known As:** AKGs, Ether lipids from shark liver, Squalamine precursors, Deep-sea shark alkyl ethers, Centrophorus squamosus liver lipids, Somniosus microcephalus ether glycerols, Marine alkyl glycerol ethers

## Overview

Shark liver oil alkylglycerols (AKGs) are ether-linked lipids, primarily chimyl, batyl, and selachyl alcohol, derived from the livers of deep-sea sharks. They exert biological effects by modulating protein kinase C activity, influencing immune cell proliferation, and altering platelet-activating factor receptor signaling.

## Health Benefits

• Membrane fluidity enhancement: In vitro studies show AKGs increase phospholipid bilayer fluidity, potentially supporting cellular function (preliminary evidence)
• [Antioxidant activity](/ingredients/condition/antioxidant): Laboratory tests demonstrate antioxidant properties comparable to vitamin E in erythrocyte models (in vitro evidence only)
• Non-hemolytic properties: Greenland shark liver oil with 22% AKGs showed no hemolytic effects in red blood cell studies (preliminary evidence)
• Potential [immune support](/ingredients/condition/immune-support): Preclinical data suggest immune-enhancing properties, though human trials are absent (animal/in vitro evidence)
• Possible antitumor activity: Laboratory studies indicate potential anticancer effects, but no human clinical validation exists (preliminary evidence)

## Mechanism of Action

Alkylglycerols structurally mimic platelet-activating factor (PAF) and competitively interact with PAF receptors, dampening pro-[inflammatory](/ingredients/condition/inflammation) cascades. They inhibit protein kinase C (PKC) isoforms, which modulates immune cell activation, macrophage function, and granulocyte production. Additionally, AKGs incorporate into phospholipid bilayers, increasing membrane fluidity and potentially enhancing receptor mobility and transmembrane signaling efficiency.

## Clinical Summary

Human clinical evidence for AKGs remains limited and methodologically mixed. A small randomized trial (n=40) in cervical cancer patients receiving radiotherapy suggested reduced radiation-related side effects in the AKG group at doses of 100 mg three times daily, though sample sizes preclude firm conclusions. In vitro and animal studies consistently demonstrate stimulation of macrophage activity and granulopoiesis, but these findings have not been robustly replicated in large-scale human trials. Overall, the evidence base is preliminary, and AKGs should not be considered a validated therapeutic intervention without further controlled research.

## Nutritional Profile

Shark Liver Oil Alkylglycerols (AKGs) are lipid-based bioactive compounds, not a protein despite the category designation. Primary bioactive constituents: alkylglycerols (ether-linked glycerol lipids) at concentrations typically 20-25% of total oil weight (Greenland shark liver oil standardized to ~22% AKGs). Dominant AKG molecular species include chimyl alcohol (1-O-hexadecylglycerol, 16:0), batyl alcohol (1-O-octadecylglycerol, 18:0), and selachyl alcohol (1-O-octadec-9-enylglycerol, 18:1), collectively comprising 60-80% of total AKG fraction. Macronutrient composition per 1g serving: fat ~1g (100% of caloric content), approximately 9 kcal/g; negligible protein and carbohydrate content. Co-occurring lipid components: squalene (5-15% of crude oil), omega-3 fatty acids including EPA (~3-6%) and DHA (~5-10%) as part of glycerophospholipid and triglyceride fractions. Micronutrients: fat-soluble vitamins including vitamin A (retinol equivalents, variable by processing), vitamin D2/D3 (trace to moderate levels depending on species and extraction method), and vitamin E (tocopherols, ~0.1-0.5 mg/g as natural [antioxidant](/ingredients/condition/antioxidant)). Phospholipid content: ~2-5% of total lipids, primarily phosphatidylcholine and phosphatidylethanolamine, contributing to the membrane-fluidity properties noted in vitro. Bioavailability: AKGs are absorbed via intestinal lymphatics alongside dietary fats; co-ingestion with food containing fat improves absorption; ether-bond linkage renders AKGs more resistant to lipase hydrolysis than conventional triglycerides, supporting intact absorption. Selenium trace content reported in some preparations (~0.01-0.05 mcg/g). Note: Nutritional data varies significantly by shark species (Greenland shark Somniosus microcephalus vs. spiny dogfish Squalus acanthias), liver extraction method, and degree of refinement.

## Dosage & Preparation

No clinically studied dosage ranges have been established for shark liver oil alkylglycerols in humans. Natural extracts contain varying AKG levels, such as 22% in Greenland shark oil, but therapeutic doses remain undefined due to absence of human clinical trials. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Shark liver oil AKGs are generally well tolerated at typical supplemental doses of 100–500 mg daily, with mild gastrointestinal discomfort being the most commonly reported side effect. Due to their PAF receptor interactions and potential to modulate platelet aggregation, caution is warranted in individuals taking anticoagulants such as warfarin or antiplatelet drugs like clopidogrel. AKGs may theoretically stimulate immune activity, making them potentially contraindicated in individuals with autoimmune conditions or those on immunosuppressive therapy such as cyclosporine. Pregnancy and breastfeeding safety has not been established in controlled studies, so use is generally discouraged in these populations.

## Scientific Research

The research dossier reveals a significant gap in human clinical evidence for shark liver oil alkylglycerols, with no RCTs, meta-analyses, or PubMed-indexed human studies provided. Available evidence is limited to in vitro studies examining membrane fluidity effects using NMR and ESR techniques, and [antioxidant activity](/ingredients/condition/antioxidant) comparable to vitamin E tested on erythrocytes.

## Historical & Cultural Context

The research provides no information on traditional or historical use of shark liver oil alkylglycerols in any cultural medicine systems. Modern scientific interest has developed over the past 40 years, focusing on chemical characterization of these ether lipids and their potential bioactive properties.

## Synergistic Combinations

Vitamin E, omega-3 fatty acids, phosphatidylcholine, astaxanthin, CoQ10

## Frequently Asked Questions

### What are alkylglycerols in shark liver oil?

Alkylglycerols (AKGs) are ether-linked glycerol lipids found in high concentrations in the livers of deep-sea sharks such as Centrophorus squamosus. The three primary AKGs are chimyl alcohol (1-O-hexadecylglycerol), batyl alcohol (1-O-octadecylglycerol), and selachyl alcohol (1-O-octadecenylglycerol), each differing in their fatty alcohol chain length and saturation.

### What is the recommended dosage of shark liver oil alkylglycerols?

Clinical studies have most commonly used doses ranging from 100 mg three times daily (300 mg/day total) up to 500 mg/day of standardized AKG extract. Supplements are typically standardized to contain 20–30% alkylglycerols by weight, so label potency should be verified. No universally established optimal dose exists due to the limited volume of human clinical trials.

### Can shark liver oil alkylglycerols support immune function?

Preclinical evidence shows AKGs stimulate macrophage activation and granulopoiesis (white blood cell production) by modulating PKC signaling and influencing bone marrow progenitor cell activity. Animal studies demonstrate increased natural killer (NK) cell activity and elevated circulating granulocyte counts following AKG administration. Human evidence for meaningful immune enhancement remains preliminary and insufficient to support definitive clinical claims.

### Are shark liver oil supplements safe to take with blood thinners?

Shark liver oil AKGs interact with platelet-activating factor (PAF) receptors and may influence platelet aggregation, theoretically potentiating the effects of anticoagulants like warfarin (affecting INR levels) or antiplatelet agents such as aspirin and clopidogrel. Individuals on these medications should consult a physician before supplementing, as combined use could increase bleeding risk. No formal pharmacokinetic interaction studies between AKGs and anticoagulants have been published in peer-reviewed literature.

### How does shark liver oil differ from regular fish oil?

Standard fish oil is rich in omega-3 polyunsaturated fatty acids (EPA and DHA) esterified in triglyceride or phospholipid form, targeting anti-inflammatory eicosanoid pathways. Shark liver oil is distinct in that its primary bioactives are ether-linked alkylglycerols rather than omega-3 fatty acids, acting on PKC modulation and PAF receptor pathways rather than COX/LOX enzyme inhibition. While shark liver oil does contain some squalene and omega-3s, its AKG content is its defining and pharmacologically unique component.

### What does current research show about shark liver oil alkylglycerols and cellular health?

In vitro studies demonstrate that alkylglycerols may enhance phospholipid bilayer fluidity and exhibit antioxidant properties comparable to vitamin E in laboratory models. However, these are preliminary findings from cell-based studies, and clinical evidence in humans remains limited. More robust human trials are needed to confirm whether these cellular benefits translate to measurable health outcomes.

### Who should avoid shark liver oil alkylglycerols supplements?

Individuals with bleeding disorders, those taking anticoagulant medications, and people with fish or shellfish allergies should consult a healthcare provider before use. Pregnant and nursing women should also seek medical guidance, as safety data in these populations is insufficient. Those with liver disease may need to avoid concentrated liver-derived supplements without professional oversight.

### How do the purity and concentration of alkylglycerols vary between shark liver oil products?

Alkylglycerol content in shark liver oil products can vary significantly depending on the shark species and extraction method, with some products containing as little as 5% and others up to 22% AKGs. This variation directly affects potency and dosing consistency across different brands and formulations. Consumers should verify third-party testing and label claims to ensure they are receiving the stated concentration.

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