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Nutrition

Oysters are an excellent source of zinc, iron, calcium, and selenium, as well as vitamin A and vitamin B. Oysters are low in food energy; one dozen raw oysters provides only 460 kilojoules (110 kilocalories). They are rich in protein (approximately 9 g in 100 g of Pacific oysters). Two oysters (28 grams or 1 ounce) provide the Reference Daily Intake of zinc and vitamin B.

Traditionally, oysters are considered to be an aphrodisiac, partially because they resemble female sex organs. A team of American and Italian researchers analyzed bivalves and found they were rich in amino acids that trigger increased levels of sex hormones. Their high zinc content aids the production of testosterone.