Humans likely obtained sufficient vitamin C from their diet (e.g., ~15mg per pound of meat) and did not require high supplemental doses (500-1000mg).

“it seems like that it seems like it would have been something that would have been readily available or else wouldn't mean the mutation would you know we would have perhaps if all the ability to make it again or evolved you know or that group of people the first time there was a polymorphism in one of our ancestors and they can make vitamin C they would have out competed everybody right and it would have come back into the population it just seems kind of hard for me to believe like that we would have needed five hundred to a thousand milligrams to be ideal”