Comparing Krill Oil, Fish Oil, and Soy Lecithin: Lab Clues About Insulin Signaling

Researchers used advanced lab techniques (metabolomics and lipidomics) to map out the chemical differences between krill oil, fish oil, and soybean lecithin. They found thousands of distinct molecular features, showing that these three oils have very different compositions, especially when it comes to phospholipids, fatty acids, and other lipid types.

Using computer modeling (network pharmacology and molecular docking), the team identified several proteins—including AKT1, IL6, PPARG, and SRC—that are commonly linked to insulin signaling and metabolism, and that appeared to interact with compounds found in these oils.

In a lab dish experiment using fat cells (3T3-L1 adipocytes) exposed to an inflammatory trigger (TNF-alpha), all three oils helped restore some glucose uptake that had been reduced by inflammation, with krill oil showing the strongest effect among the three. Krill oil also changed the activity ratios of two insulin-signaling proteins, AKT and IRS1.

The authors note these results are exploratory. The study didn’t match EPA/DHA doses across oils, so it can’t say whether the effects come from the omega-3s themselves, the phospholipid form, or other compounds. It also doesn’t prove any effect in humans.