Vitamin C Day
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Throughout the relevant literature you will primarily see references to acorbic acid which is the water soluble form. However there are variants on that such as esters like the fat soluble ascorbyl palmitate.
The primary value of acorbates lay in the free radical scavenging of other molecules to remove or deactivate them ensuring they will not cause any untoward metabolic reactions. As it would happen, one of the most common free radicals is oxygen itself. Essential, but potentially harmful if left to bond with anything and everything in the metabolic pathways.
According to some, vitamin C is also a potent immune stimulant but others I've read feel that the jury is still out on vitamin C and it's effect upon the immune system. Most studies I have read weren't very well designed and the conclusions point toward ascorbates as cofactors more than standalones as an immunostimulant.
Regardless, I view vitamin C and the herb echinacea purpurea as effective as anything for warding off winter illnesses and have long standing personal testing with which to back up those opinions.
Be all of this as it may, moderation in all things and I am not a proponent of "megadose" in any nutraceutical and/or herbal supplementation. Regardless, I am not a big fan of "RDAs" either because I don't believe dietary intake of most water soluble vitamins is adequate ... I suppose I may simply prefer to make expensive urine.
I am also a proponent of frank discussions with medical practitioners prior to engaging any immunostimulant regimen on your own; particularly in the case of an "enthusiast" who may lack sufficient expertise and/or experience — the point being that vast difference between "enthusiast" and "expert".
Barring any allergies to (typically synthetic) ascorbates a little extra vitamin C every day can't hurt and can go a long way towards health maintenance ... as long as you don't get carried away.
When I'm feeling 'less healthy' on occasion there are typically upwards of 6 grams (that's 6000 milligrams) of vitamin C a day taken with copious amounts of water. In severe illness I have been known to pop 10 grams or more in a day.
Tablets of vitamin C are pretty stable whereas solutions of vitamin C are considerably less so from a storage perspective. I model my intake after the late Dr Linus Pauling whose work I studied a lot in the begining of my career in the oldy but goody medical database administrator days.