It is interesting but there is some misinformation.

The article says: “And popping a few extra vitamin Cs during this time of year certainly can't hurt.”

Vitamin C has been promoted out of proportion by the citrus growing corporations. Most of the general public in American do not really study science in high school. So it is easy to be fooled by the advertising of special interest groups, like juicing machine, raw food, citrus, apple juice, pomegranate juice, noni  juice ,  etc.

Supplemental vitamin C is bad for people with hemochromatosis, an iron overload disease. Since vitamin C increases iron absorption.

Too much vitamin c and change into oxalic acid which can combine with any metal, especially calcium and create stones, like kidney stones which may cause kidney failure.

A friend from Singapore emailed me about a Malaysian after eating star fruits ended in coma. The hospital said he had kidney failure and did not know why because the doctors thought star fruits are not toxic. Actually star fruit is high in oxalic acid like spinach which is also high in dioxin.

Recently in Macau there are 2 cases of kidney failure after eating star fruits which are high in vitamin C and oxalic acid.

Too much C can make the body leach out copper, reduce Vitamin B12, increase oxygen demand, and promote oxidation (opposite of anti-oxidant).

Too much NO can be toxic to the brain cells.

The food birds’ nest is good for NO because it is high in readily usable L-arginine. The enzymes, nitric oxide synthases or NOS, converts the amino acid L-citrulline  to  L-arginine and forms nitric oxide

Lack of copper can cause premature white hair.

For discussing biochemistry, Ginnie, my young daughter should be the person. She graduated from UC Berkeley majoring in bio chemistry. Although I studied medical bio chemistry but it was more than half century ago. Although I am try to keep up with continuing education courses but there is only so much one can keep up.

See: http://www.absw.org.uk/Briefings/Nitric%20oxide.htm