How Krill Oil Supports Heart Health: What You Need to Know

What is Krill Oil?

Krill oil is a dietary supplement that is extracted from tiny, shrimp-like marine crustaceans called krill. They typically measure about 2 to 6 centimeters (roughly the size of a human thumb or paperclip) and live in massive swarms throughout all of the world's oceans. 

Nutritional Profile of Krill Oil

Krill oil contains a unique blend of omega-3 fatty acids, astaxanthin, and choline. These nutrients provide a plethora of health benefits to us. Research indicates that supplementing with krill oil positively affects markers of inflammation, oxidative stress, muscle function, glucose metabolism, and lipid profiles.

The Power of Omega-3 Fatty Acids

Krill oil contains the omega-3 fatty acids EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). These fatty acids are long-chain omega-3 polyunsaturated fatty acids found primarily in marine sources like fatty fish, algae, and of course krill. Because the human body cannot produce them efficiently on its own, they must be obtained through diet or supplementation. It is important to obtain these fatty acids because of the benefits they provide for the human body.

EPA

The primary role of EPA is in reducing inflammation and supporting heart health by lowering blood triglycerides and assisting in circulatory function. High blood triglycerides can contribute to negative health side effects such as heart disease, stroke, metabolic syndrome, and pancreatitis. EPA produces signalling molecules called eicosanoids that help combat chronic inflammation. EPA also helps preserve gray matter in the brain, offering neuroprotective support and combating mood disorders such as depression and anxiety.

DHA

The primary role of DHA is acting as a major structural component of the brain, cell membranes, and the retinas of the eyes. DHA is also essential for visual and cognitive development during pregnancy, infancy, and early childhood, but it also helps maintain normal brain function, memory, and synaptic signaling all throughout life. DHA has also been shown to have strong links to anti-aging brain health and lowering the risk of cognitive decline. 

Benefits of Astaxanthin

Astaxanthin is a potent carotenoid antioxidant that gives krill oil its natural reddish color and helps protect the oil from oxidation. Astaxanthin is a naturally occurring keto-carotenoid and potent antioxidant found in microalgae, yeast, and marine life like salmon, trout, and krill.

There are many potential benefits of astaxanthin. Here are some of them:

Antioxidant & Anti-Inflammatory Protection

By neutralizing free radicals and reducing oxidative stress, which is a core driver of aging and chronic inflammation, astaxanthin acts as an antioxidant and creates protection against inflammation. Research suggests its antioxidant activity is significantly stronger than that of common antioxidants like vitamin E and vitamin C.

Skin Health & Anti-Aging

Regular intake of astaxanthin may help improve skin moisture, elasticity, smooth out fine lines and wrinkles, and protect against UV-induced skin damage and photoaging.

Eye & Vision Support

Because astaxanthin can cross the blood-retinal barrier, it may help to boost blood flow to the eyes, support visual acuity, alleviate eye strain, and aid in managing symptoms of dry eye disease.

Brain & Cognitive Function

Being able to cross the blood-brain barrier, it may support central nervous system health, improve working memory and thinking skills, and potentially lower the risk of age-related cognitive decline.

Heart & Metabolic Health

Astaxanthin may help improve blood lipid profiles (such as lowering LDL cholesterol and triglycerides while supporting HDL), aid in blood pressure regulation, and support glucose metabolism.

Immune & Exercise Support

Astaxanthin can activate immune cells (such as T-cells and NK cells), while higher doses have been studied for improving endurance, reducing muscle damage, and speeding up post-exercise recovery

The Role of Choline

An essential water-soluble organic compound nutrient involved in cell membrane signaling and structure, metabolism, and nervous system / brain health. Its key functions include:

• Cell membrane maintenance: It is used to make phosphatidylcholine and sphingomyelin, two vital phospholipids that keep cell walls intact.
• Brain & nerve signaling: It acts as a precursor to acetylcholine, a neurotransmitter crucial for memory, mood, and muscle control.
• Liver health promotion: It helps transport fats and cholesterol out of the liver, preventing the buildup of fat that can lead to nonalcoholic fatty liver disease (NAFLD).
• Gene & DNA support: It supplies methyl groups needed for various metabolic and gene-regulating processes.

Krill Oil vs Fish Oil

Both krill oil and fish oil provide the essential omega-3 fatty acids EPA and DHA that we discussed which support heart, brain, and joint health, though they differ significantly in absorption and composition. 

Benefits of Krill Oil for Cardiovascular Health

While krill oil does share many of the same properties as traditional fish oil, its unique molecular structure offers distinct advantages for heart health. Clinical trials show krill oil supplementation significantly lowered total cholesterol, low-density lipoprotein cholesterol, and triglycerides. It has been known to improve blood lipid profiles by lowering triglycerides. Triglycerides are the fats found in blood and high levels of these fats are linked to heart disease, but krill oil is known to consistently and significantly reduce the levels of triglycerides in the blood. Krill oil is also known for reducing total and low-density lipoprotein (LDL) “bad” cholesterol, and raising high-density lipoprotein (HDL) “good” cholesterol. 

Reducing Inflammation

Krill oil reduces inflammation primarily through its unique combination of omega-3 fatty acids, phospholipids, and the antioxidant astaxanthin, which work together to suppress inflammatory pathways in the body. This compositional synergy may modulate inflammatory pathways, redox balance, membrane dynamics, and cellular signaling, thereby influencing physiological systems implicated in aging biology according to Nutrients journal.

The EPA and DHA within krill oil get incorporated into cell membranes and reduce the production of inflammatory-signaling molecules. This EPA and DHA from krill oil specifically are more easily absorbed into the human body because the omega-3s in krill oil are largely bound to phospholipids, a structural form that matches human cell membranes closely. This increased efficiency of absorption allows for the DHA and EPA to target tissues easier. 

The astaxanthin in krill oil has the ability to neutralize free radicals and oxidative stress, helping to prevent oxidative damage that can make inflammatory responses appear in the body or worsen preexisting conditions. Krill oil components can suppress the expression and release of specific inflammatory markers, including tumor necrosis factor-alpha (TNF-α), interleukin-8 (IL-8), and C-reactive protein (CRP). They can also help preserve the tight junction proteins such as E-cadherin and zonula occludens-1 in epithelial barriers, limiting the invasion of inflammatory triggers like gut bacteria.

Lowering Cholesterol Levels

Krill oil lowers cholesterol through several biological mechanisms that affect how your body makes, processes, and clears fats. It inhibits cholesterol synthesis by suppressing the activity of HMG-CoA reductase, a key liver enzyme your body needs in order to manufacture cholesterol in the first place. It also stimulates the expression of “bad” cholesterol LDL receptors in the liver, which increases the clearance and uptake of the LDL cholesterol out of your bloodstream and into tissues. Additionally, krill oil promotes the excretion of cholesterol through the gut, helping your body get rid of excess lipids.

Krill Oil Supplements: What to Look For

When looking for krill oil supplements, there are a few elements to look out for. Firstly, the omega-3 content needs to be high enough for proper effectiveness. The supplement should contain 300mg or more per capsule. Secondly, be sure that the supplement is sourced sustainability. Finally, choose supplements that are 3rd party tested for contaminants.

Potential Side Effects

Krill oil supplements are generally well tolerated, but they can potentially cause some side effects ranging from mild digestive issues to more serious risks for specific individuals.

Mild Side Effects:

• Gastrointestinal upset: Mild nausea, indigestion, bloating, heartburn, gas, and diarrhea or loose stools. (Taking krill oil with food can help reduce these effects).
• Fishy aftertaste or burps: Though generally less pronounced than with standard fish oil, some people still experience a fishy taste, belching, or smelly sweat/breath.
• Headaches or mild skin reactions: Less common, occasional reports of skin irritation or headaches.

Serious Risks & Precautions:

• Seafood or shellfish allergy: Because krill are small, shrimp-like crustaceans, anyone with a shellfish allergy should avoid krill oil.
• Increased bleeding risk: High doses of omega-3 fatty acids can slow blood clotting. This raises the risk of bruising, nosebleeds, or prolonged bleeding, especially if you take blood-thinning medications (anticoagulants or antiplatelets) or plan to have surgery (doctors usually recommend stopping omega-3s about two weeks beforehand).
• Blood sugar and drug interactions: High doses may affect blood glucose levels or interact with diabetes medications and weight-loss drugs like orlistat (which can reduce absorption).
• Pregnancy and breastfeeding: Safety data during pregnancy and lactation is insufficient, so medical guidance is advised. 

Frequently Asked Questions (FAQ)

Krill Oil for a Healthy Heart

Krill oil’s unique nutrient profile, with omega-3 fatty acids, astaxanthin, and choline provide a plethora of health benefits to us, positively affecting markers of inflammation, oxidative stress, muscle function, glucose metabolism, and lipid profiles.