Thorne has been tested by a third party to be consistent in having in them what is on the label.
Whole foods are good sources as they have so many other things in them yet to be discovered that benefit health synergistically.
https://www.greenmedinfo.com/ is a great resource for searching effects of supplements and of foods.
Flax seeds freshly ground or flax oil is a great source of omega 3s. Check out Dr. Brooke Goldner. https://goodbyelupus.com/about-dr-g/