Real life tip: never eat raw, and take vitamin C supplements only. The multivitamin supplements contain rust, which actually is deadly to your liver and kidney and bladder ( the rust stick there, bonding with calcium ).
Raw is good in the past, in the present, the fish all contain oil sediments and even plastic that you will notice it after you cook ( plastics in frying fish separate from the meat and crumple and turn brownish with boiling cooking oil - throw them away ).
What kind of fake news bot is this? Or some kind of AI-authored reply?
Rust, iron-oxide, aka iron, is sometimes included in multi-vitamin supplements, because, you know, some people might need that extra iron. It's NOT deadly or harm to your liver, kidney or bladder, unless you overdose it. It dissolves in stomache acid to Fe3+, and then in duodenum reduced to Fe2+ which body then can take up and use. Also, calcium may inhibit iron uptake somewhat if both are ingested at the same time(for example, dairy and iron supplement) but there's no bonding between them.
In the past, raw would have been a no-go, because unlike modern equipment, you can't flash-freeze stuff to get rid of parasites(practically all commercially available fish available today raw has been flash-frozen). Not sure how they deal it in this story.
And you might get a few microplastics from fish, but that applies to most of the stuff you eat, even meat. And it certainly doesn't have a handle against the proven health benefits of fish consumption in general.