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