What's a difference between fish oil capsules and omega 3-6-9 capsules? Which ones should I take as a diabetic?

None. Krill oil and fish oil are the new snake oil, both are high in omega 3 fatty acids which are extremely fragile. Omega 3 fish oils reduce triglycerides by impairing the liver's ablility to make them. However the oxidative stress caused by fish oil actually raises LDL cholesterol. Some day we may use the phrase "this is just more fish /krill oil" or "here comes the fish/krill oil salesman".
That depends. Fish oil is usually omega 3. Fish that consume certain algae deposit that in their flesh. This is definitely good for patients with heart disease and for prevention. Omega 6 comes from vegetables as does 9. 9 is good for the heart and glucose levels. Check with your pcp what they prefer. 3 & 9 convey more benefit for your heart and control inflammation. Your pcp should help you choose best.

Related Questions

I read somewhere that fish oil supplements shouldn't be taken by diabetics. Is this true? I was under the impression that omega 3 is good for heart...

Fish oil/ diabetes. I am not sure where you read that. Fish oils have a lot of benefits. They lower triglycerides, have beneficial effects on the heart (decrease arrhythmias, inhibit clotting), they are antiinflammatory. If you do not have any of the above problems, fish oils may not have any direct benefit, but they will not hurt. How about trying to increase your n-3/n-6 ratio through a healthy diet? Read more...
Fish oil. Is nit bad for diabetes, especially if they have high triglycerides. Read more...

What is the difference between "omega-3 fish oil" and " Omega-3 salmon oil" supplements? Which one is the best?

The same. Both are making the same claim but different formulations will supply more of the actual active ingredient, so you must read the label carefully. Better yet, eat fish! Mackerel is the best. Salmon is also good. Read more...

What's the difference between the omega 3 fatty acids found in flax seed oil and fish oil?

Different fats. The fatty acid most commonly found in flax-seed oil is ?-linolenic acid (ala, 18 carbons and 3 double bonds). In fish oil, they are eicosapentaenoic acid (epa, 20 carbons and 5 double bonds), docosahexaenoic acid (dha, 22 carbons and 6 double bonds). Ala converts to epa and dha, but in limited amounts. Best to get your epa and dha from actual wild salmon and your ala from flax. Read more...