Fish oil, cod liver oil, krill oil?

[Richardg8092]

I am concerned with the heavy metals, which accumulate in fish and even more in those products.

That's certainly an advantage that Krill has over Fish - their life cycle is very short - they don't have much time to accumulate heavy metals.
Older / larger fish have eaten other fish over time and do accumulate heavy metals.

The Fish Oil I take is sourced only from mackerel, sardines and anchovies, the latter of which are two of the smallest and cleanest omega-3 rich fish species.
It is also 'molecularly distilled' - a process which separates out heavy metals and other impurities.

When I first started taking fish oils many years ago, I took a low dose of the cheap and nasty 180/120 fish oil capsules.
They did absolutely nothing for me and I was left wondering what all the hype was about.
However, things definitely improved when I took a higher dose of a quality product.

Two decades of performing massage and one decade of bashing away at the computer keyboard has left my fingers (and elbows) cranky.
Fish oil sorts that out very nicely for me. I take them and I have no pain. If I stop taking them the inflammation returns very quickly.

For me it's similar to comparing a cheap generic med from an unknown manufacturer in a dubious region to an authentic licensed Brand name med.
With one, you take your chances with what you get, with the other you can be more certain.
That's why it's worth doing some reading, and paying for a good quality fish oil product, in my opinion.
As with virtually everything else on the planet, it's about quality and dose. (Hahaha. So Deep!  )