VITAMIN C
During the Alaskan Klondike gold rush, (1897-1898) potatoes were practically worth their weight in gold. Potatoes were so valued for their vitamin C content that miners traded gold for potatoes.
Rose hips contain high levels of vitamin C, and have been used medicinally for thousands of years for all sorts of ailments, from constipation to insomnia.
Kiwifruits have twice the vitamin C of oranges.
Lemons are an excellent source of Vitamin C, but loses much of this shortly after being squeezed. Sailors used to travel with lemons to help prevent scurvy.
Limes are packed with Vitamin C and were eaten on ships to prevent scurvy, a disease caused by that vitamin deficiency.
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