The necessity of high vitamin C intake for human health may be overstated, as supplementation does not consistently show benefits.

“we've been told that we need tons of vitamin C to be health but if you look at the scientific literature when we give people vitamin C supplements we don't see improvements people who have higher levels of vitamin C in their blood tend to do better but those are epidemiology studies and the problem with epidemiology studies is they can so often be confounded by healthy user bias and other problems people that have higher levels of vitamin C are likely to be doing other healthy behaviors which may actually be accounting so when we give people extra vitamin C it doesn't seem to help them”