cost of 100 omega 3 capsules (in .gr): ~10 euros, fish and nuts cost about 18 euros per kilo and tend to spoil.
Yes, they do. An old study suggests an average of 20% of omega-3 fish oil products had excessive oxidation. Or in other words, rancid.
https://academic.oup.com/nutritionreviews/article/80/1/138/6...
Hemp seed oil is a good one for omega6 but usually people get enough 6 from diet and 3 is the one we need to boost to get the 3:6 ratio up