Krill oil is a source of omega-3 fatty acids, particularly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are known for their potential cardiovascular benefits. Several clinical studies have shown that krill oil can help lower blood triglyceride levels, reduce inflammation, and may improve cholesterol profiles by lowering LDL ("bad" cholesterol) and raising HDL ("good" cholesterol). These effects are believed to support arterial health by reducing risk factors associated with atherosclerosis and cardiovascular disease.

The scientific basis for using krill oil to support the arteries is similar to that of fish oil, but krill oil's omega-3s are bound to phospholipids, which may enhance their absorption and efficacy. Meta-analyses and randomized controlled trials have demonstrated modest benefits for lipid management and anti-inflammatory effects. However, while the evidence is promising, it is not as extensive or robust as that for fish oil, and some studies have shown only modest or statistically insignificant benefits. Major health organizations recognize omega-3s as beneficial for heart and arterial health, but krill oil specifically is still being researched for its comparative efficacy.

In summary, scientific evidence supports krill oil's role in promoting arterial health, with a moderate strength of evidence primarily due to its omega-3 content and bioavailability, but more large-scale studies are needed for definitive conclusions.