You can make the ester-c, emergen-c, type of stuff yourself for 1/1000th of the cost. I was buying the boxes for awhile but it gets expensive, especially as vitamin C has a half life of 4 hours so you need to keep taking it throughout the day. Places like Kwan-jai.com recommend 1000 mg's every hour for illness and such things..
puritan.com is a GREAT way to get pure ascorbic acid crystals for CHEAP. They have a 3 for 1 sale right now and they ship internationally as far as I've been told.
3 of the 20 oz
bottles is enough for years it seems. I just got a box myself.
One of the factors of how well it is absorbed is the buffering agent, it's pH and such things. That is why places like Kwan-jai.com recommend the baking soda mixture. The sodium bicarbonate buffers the acidic vitamin C powder to the body can absorb it better.
I use this stuff (Bob's red mill), which is non_aluminum. I am not sure if they ship internationally, though. The main thing to ask when inquiring about baking soda is whether or not there is aluminum in it.
The recipe kwan-jai recommends is 1 heaping teaspoon of vitamin c crystals mixed with 1/2 teaspoon of baking soda in an 8 oz
glass of water. You can slowly build up to every 4 hours if needed, but I just do it in the morning upon waking and at night before bed.
I also take the bicarbolife pills from alkalife.com in the morning with food and evening. (and L-Lysine of course)
Have you tested your pH yet? Good health food stores should sell the paper. It's a good way to get a general idea of where your body's pH is at.
Everyone is different of course, but in the same light, everyone I have advised (a handful) has had positive results regarding herpes after increasing the pH of their body.
A great starter book is: The Acid-Alkaline Balance Diet.
Wishing you well,