Heavy-duty 220 or 240-volt outlets: $300 or more for an outlet running off of a nearby outlet; $600 or more to upgrade the existing panel, which includes adding a 220 to 240 volt circuit, running the conduit, and installing a new receptacle.
Riboflavin is a B vitamin. It can be found in certain foods such as milk, meat, eggs, nuts, enriched flour, and green vegetables. Riboflavin is frequently used in combination with other B vitamins in vitamin B complex products.
Food and beverages that provide riboflavin without fortification are milk, cheese, eggs, leaf vegetables, liver, kidneys, legumes, mushrooms, and almonds. The milling of cereals results in considerable loss (up to 60%) of vitamin B2, so white flour is enriched in some countries such as US by addition of the vitamin.