Brazil nuts : |||||||||||||||||||||||||||||||||||||||||||||||||| 19.170 mcg/g Seal liver : ||||||||||||||||| 7.900 mcg/g (Ringed seal) Astragalus : ||||||||||||||||||||||||| 11.750 mcg/g (Astragalus membranaceus herb) Mixed nuts : |||||||||| 4.215 mcg/g (oil roasted, no peanuts) Pork kidneys (braised) : |||||||| 3.115 mcg/g Tuna (dried) : ||||||| 2.831 mcg/g Lamb kidneys (braised) : ||||| 2.188 mcg/g Mustard seed (ground) : ||||| 2.081 mcg/g Smelt (dried) : ||||| 1.940 mcg/g Egg white (dried) : ||||| 1.920 mcg/g Pork kidneys (raw) : |||| 1.900 mcg/g Octopus (dried) : |||| 1.698 mcg/g Squid (dried) : |||| 1.695 mcg/g Beef kidneys (simmered) : |||| 1.680 mcg/g Whole egg (dried) : |||| 1.647 mcg/g Oysters, Pacific (cooked) : |||| 1.540 mcg/g Cod (dried, salted) : ||| 1.478 mcg/g Lamb liver (cooked) : ||| 1.160 mcg/g Tuna, yellowfin (cooked) : || 1.082 mcg/g Octopus : || 0.896 mcg/g Tuna (canned) : || 0.804 mcg/g Sunflower seeds (roasted) : || 0.782 mcg/g Lobster : | 0.731 mcg/g Bacon (pork) : | 0.620 mcg/g Chia seeds : | 0.552 mcg/g Sardines (canned in oil) : | 0.520 mcg/g Halibut (cooked) : | 0.470 mcg/g Tuna (grilled) : | 0.468 mcg/g Salmon : | 0.400 mcg/g ------ These contain less than half a microgram per gram and or not significant sources of selenium -- Beef steak : 0.330 mcg/g Chicken breast (lean) : 0.319 mcg/g Egg (hard-boiled) : 0.308 mcg/g Turkey : 0.280 mcg/g Cottage cheese : 0.200 mcg/g Beef : 0.200 mcg/g