vitamin C in orange juice form is 1litre=0.5grams
anyone suggesting 5-8gram means someone has to drink 10-15 litres of orange juice

the human boy only needs ~100mg not 5000-8000

200ml or OJ (a cup/glass) is all you need. not 10-15 litres

telling people to have 5 litres of OJ or chew on 5 VitC suppliment tablets a day is foolish non-science
your body only uses what it needs and excretes the rest. you can flood it all you like but your body wont just energise and use it.
most of it will be peed out. or cause negative things like kidney stones, stomach pains nausea and other things.
so dont be foolish taking more than 1gram a day.. all you need is 0.1mg..