Beef and chicken liver (20) — 3 ounces: 81 milligrams (3,375% RDA)
Salmon (21) — 1 filet (108 grams): 19.5 milligrams (812%)
Herring (22) —1 filet (143 grams): 18.7 milligrams (779%)
Mackerel (23) — 3 ounces: 15.3 milligrams (637%)
Sardines (24) — 1 cup: 13.3 milligrams (554%)
Tuna (25) — 3 ounces: 9.3 milligrams (385%)
Trout (26) — 1 filet: 9.1 milligrams (379%)
Organic yogurt (27) — 1 container of plain Greek yogurt (170 grams): 1.3 mg (53%)
Turkey (28) — 3 ounces: 1.1 milligrams (43%)
Raw milk (29) — 1 cup: 1 milligrams (41%)
Beef tenderloin (30) — 3 ounces: 0.9 milligrams (38%)
Lamb (31) — 3 ounces: 0.8 milligrams (34%)