Krill are shrimp-like crustaceans eaten by the blue whale. Krill Oil extracted from these crustaceans contains important phospholipids which include phosphatidylcholine, phosphatidylinositol, and phosphatidylethanolamine. These phospholipids contain a high proportion of EPA and DHA, fatty acids.  As of 2011, we have not seen research that compares the clinical benefit or differences between various krill oil supplements on the market.

Benefit and uses
A few studies have been done which demonstrate it to have potential benefit in maintaining healthy cholesterol and also to play a role in premenstrual syndrome and menstrual cramps. Perhaps it can be of benefit in those with heart disease.

Buy Krill Oil, 500 mg, 30 Softgels
KriaXantin Krill Oil is an extract from Antarctic krill that is rich in cell membrane building blocks: highly unsaturated phospholipids co-functionalized with omega-3 fatty acids (EPA & DHA). Beneficial for both men and women,

Supplement Facts per 2 softgels:
buy Antarctic Krill Oil 1000 mg Yielding:
     Total Omega3 Fatty Acids 130 mg
     EPA (eicosapentaenoic acid) 50 mg
     DHA (docosahexaenoic acid) 20 mg
     Total Omega6 Fatty Acids 20 mg
     Astaxanthin 2 mg

Krill or fish oil, which one should you take, which offers more benefits?
Fish oil has a higher percentage of EPA and DHA fatty acids, however krill oil has the advantage of having a higher amount of important phospholipids such as phosphatidylcholine, phosphatidylinositol, and phosphatidylethanolamine. Krill oil also contains astaxanthin, an important carotenoid antioxidant. Therefore, one option is to use a capsule of each, or alternate their use. It is difficult to predict in any individual person supplements are more beneficial. Either product can be used together with other supplements and herbs such as tongkat ali.

Evaluation of the effects of Neptune Krill Oil on the clinical course of hyperlipidemia.
Altern Med Rev. 2004.
To assess the effects of krill oil on blood lipids, specifically total cholesterol, triglycerides, low-density lipoprotein (LDL), and high-density lipoprotein (HDL), a multi-center, three-month, randomized study was done of patients treated with 1 gram and 1.5 g krill oil daily. A sample size of 120 patients (30 patients per group) was randomly assigned to one of four groups. Group A received krill oil at a body mass index (BMI)-dependent daily dosage of 2-3 g daily. Patients in Group B were given 1-1.5 g, and Group C was given fish oil containing 180 mg eicosapentaenoic acid (EPA) and 120 mg docosahexaenoic acid (DHA) per gram of oil at a dose of 3 g daily. Group D was given a placebo containing microcrystalline cellulose. Neptune Krill Oil was provided by Neptune Technologies and Bioresources, Laval, Quebec, Canada. The results showed Krill oil 1-3 g per day to be effective in the reduction of glucose, total cholesterol, triglycerides, LDL, and HDL, compared to both fish oil and placebo. At lower and equal doses, krill oil was significantly more effective than fish oil for the reduction of glucose, triglycerides, and LDL levels.

Research review and questions
I much appreciate the low-key, un-pushy, approach of your information. I also read Dr Mercola newsletters. He is a great fan of krill oil but I chose to buy the krill product that you offer rather than Dr. Mercola recommendation. I see that this morning the good doctor rubbishes all products but his own. This does tend to be a habit of his and perhaps it is sometimes justified. I would be grateful if you could read what he says and advise.
    We take great effort to be as accurate as we can on the topics we write about and the products that are listed on our web site. We try as much as possible to not comment on information on other web sites unless the information is potentially harmful to the consumer. As such, you may wish to read this information and then decide how you wish to proceed.