KNOW WHAT A LITTLE GEM THE CUCUMBER IS, YOU MAY LOOK AT IT DIFFERENTLY NOW. 1. Cucumbers contain most of the vitamins you need every day, just one cucumber contains Vitamin B1, Vitamin B2, Vitamin B3, Vitamin B5, Vitamin B6, Folic Acid, Vitamin C, Calcium, Iron, Magnesium, Phosphorus, Potassium and... Sign in to see full entry.