Hi! I don't think parasites are a concern for cod fish oil because it's usually pasteurized as far as I know.
But what I heard is that fish oil is not healthy to consume in supplement form, fish oil from supplements is really suspectable to oxidizing, because of how much PUFA they contain. Oxidized oils are highly inflammatory.
"
Can fish oil oxidize?
Marine omega-3 rich oils are used by more than a third of American adults for a wide range of purported benefits including prevention of cardiovascular disease. These oils are highly prone to oxidation to lipid peroxides and other secondary oxidation products." (
https://www.ncbi.nlm.nih.gov/pmc/articl ... 20products.)
So I think it's better to just eat fatty red fish and mackerel, halibut, sardines, etc.
Plus, whole wild fish is really good for balancing hormones and androgens, as well as thyroid.
"Various studies also indicate promising anti-hypertensive, anti-cancer, antioxidant, anti-depression, anti-ageing, and anti-arthritis effects, whilst more recent studies suggest positive anti-inflammatory, hormonal and metabolic benefits from adding fish to our diet. (Mendevil, 2021; Siriwardhana et al, 2012)."