• Yeah, no need to worry about Norwegian and Icelandic cod fisheries. Can't be fucked to find any sources right now, but basically they've been at sustainable levels for decades.

    But yes, you are right to be suspicious in general. Lower priced brands mix in fish oil caught in the Pacific. Not only are they mostly not monitored, but the liver oil is pretty much a by product that they throw together with a shrug in whichever container they have at hand.
    Hidden camera reports from Peru and Chile have shown buckets full of rank mouldy shit. Probably more harmful than healthy to the human consumer.

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