I can't, but I can tell you this: Eat a green pepper if you're looking
for C.  They're a 1,000 times better than any pill or powder.
Patrick

It depends on how much vitamin C you are trying to take.  For a dose of
1,000 or 2,000 mg. pills seem just fine.  Some people need to take much
higher doses when fighting a particular illness.  I take 10,000 mg per
day.  That amount works well for me.  When I tied to take so many
pills, my stomache felt queasy.  There are binders in the pills which
probably caused that reaction.  I have bought the powder which I mix
with juice.  I am very happy with it.  It is pure Vitamin C.