What lettuce has the most vitamins?

Online Answer
So, to answer your question, the most nutritious lettuce is Romaine. Compared to red leaf, green leaf, butterhead (Boston and bib types) and iceberg, it delivers more folate, potassium, beta carotene and lutein.
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Contaminated romaine lettuce that made people sick in this outbreak harvested from the Salinas Valley growing region in California is no longer available for sale. CDC is no longer advising that people avoid romaine lettuce from this growing region.