Reindeer/caribou is one of the things keeping many nothern people going, I heard that they ate all of the deer, including the contents of the stomach - broken-down lichen, rich in vitamin C.
Then later I also heard that raw meat may contain some vitamin C, which is lost during cooking.
Wikipedia says:
(...) adequate vitamin C could be obtained from items in their traditional diet of raw meat such as ringed seal liver and whale skin (muktuk). While there was considerable skepticism when he reported these findings, they have been borne out in recent studies and analyses
All in the need for survival, no wonder they are call them the Eskimos, checked up and it came from the meaning "eaters of raw meat" , but that's all in the quest for survival