Good advice. Additionally, I’d recommend that with any supplement you evaluate the source you’re buying from. I typically use Nootropics Depot (avoiding linking so this doesn’t look like a full blown add - check my history though, not a shill) and they use 3rd party lab testing to back up claims.

+1. ND and Thorne I trust blindly.

Wild alaskan salmon Alaskan people are tested regularly for mercury due to high fish consumption

Will check it out, never heard of krill.

There are plant based alternatives too, which are derived from kelp.

Mercury is generally concentrated in the meat, not the fat. (It has an affinity for the thiol groups on certain amino acids in protein.) There's certainly other fat-soluble pollutants like PCBs to worry about, but I'd never heard of any fish oil products having significant mercury contamination. I'd love to see the info you've been looking at?

Any decent brand is using molecularly distilled fish oil.

For Nordic people, Norwegian salmon is likely the worst possible source. Too many bad things going on with that farming.

I met plenty of Norwegians while living there who refused to eat local Salmon, they have a pretty good idea where it comes from.

Yup. It's gross. Ever see the documentary about fish lice and food pellets?

Worse is the fact that some will escape, spreading their messed up genes and diseases to wild populations.

Just eat the right kind of salmon: "All species of Alaska wild salmon have very low levels of mercury."

From: https://health.alaska.gov/dph/Epi/eph/Pages/fish/default.asp...

Emptying the oceans of krill isn't a very good idea either unfortunately, and that's pretty much what we're doing.

Some skimming of Wikipedia suggests that our total annual krill harvest is about 1/950th of the amount that predators eat of the main krill species per year.

Also usually the smaller the animal / the farther down the food chain, the faster they reproduce. And some more reading of Wikipedia suggests that krill can reproduce very quickly.

That's one perspective.

I worked at a Norwegian company that ran 5 huge ships gulping krill 24/7 in the arctic region.

Once you see the scale of operation, it becomes pretty obvious it's a problem, and I'm pretty sure those numbers are manipulated to hide it.

Overlooked one major benefit of salmon though: it tastes great and I would rather eat salmon than krill oil caps ;)

To be fair, there’s low heavy metal contamination salmon on the market; a few sibling comments mentioned wild Alaskan salmon, but I also think farmed salmon tends to be lower in Hg content that the “average” wild salmon.

Or, take ALA which is just omega-3 and nothing else.

Sardine. Most underrated fish ever.

Almost as good as salmon re: Omega-3, but low mercury content.

Worth noting that canned "sardines" can be any of a multitude of unrelated fish, so it's not a good differentiator. Although they tend to be small fish, which is probably a reasonable predictor for lower mercury content.

Flax is also really easy to add to a smoothie if you have a decent blender, my recipe: almond milk (any type of milk or yogurt), frozen berries, oats, flax seeds. Just blend it up and eat it for breakfast. Washing blenders after you finish is often easy as you can just add water and a drop of dish soap and then run it once more and then pour it out.