5. Shellfish
Many sea creatures are nutrient dense, but shellfish may be the most nutrient-dense of all. Clams, oysters, scallops, and mussels are among the most popular shellfish.
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Clams are one of the best sources of vitamin B12, with 100 grams providing over 16 times the RDI. Vitamin C, various B vitamins, potassium, selenium, and iron are all abundant in them.
