The one on my top lip has got no worse. Had the tingling feeling and some swelling, it was defenitly a cole sore. The swelling is going down. It had not bust out.

I guess the Vit D is bringing them on more but halts them from bursting out!!

Well i did'nt find any studies as you are looking for on colesores.

I found the idea while i was reading articules on mercola.com, but it was in the responces but readers section that i read from a reader, they stated this.

Maybe your allergic to the vit d supplements? I think it states on the site where i bought my vit d supplements that vit d supplements are made from the oil in sheeps wool.

hi! i signed up to talk to you about your question even though its been 3 months. i recently started taking 2,400 units of vit d3 because of the stuff i read on mercola.com in help to fight the flu and keep it away but i have herpes type 2 and when i first started taking the vit d3 at only about 1,200units i had an outbreak and didnt think anything about it because i am pregnant and figured that was why i had the outbreak. and i been sick with a cold twice! then, my husband who i have been with for 5 years i started him on vit d3 because i am afraid of him bringing home h1n1 and he got an outbreak and we didnt even know he had it! then i got it on my mouth! i believe it is all because of the vit d3. steroids cause herpes outbreaks and vit d3 is a steroid. i started to take the anti-viral my Dr prescribed me and i kept taking the vit d3 still not linking the two and it just kept getting worse and i couldnt figure out why i thought maybe it was poison ivy on my mouth because i had that on my belly. which didnt last long because i believe the steriod 'vit d3' suppressed the poison ivy. so i know its herpes now on my mouth all from the Fing vit d3 i am really frustrated because i got this disease from working at a freaking thrift store and now i gotta deal with all this for the rest of my life and worry about infecting my children. i have a site that someone has done research on vit d3 and its bad effects. it doesnt talk about cold sores or anything but there are people who believe vit d is bad and go as far as to cover up every inch of their body when they go outside! crazy. but is it? im starting to wonder because i also started getting a lot of pimples when i started the vit d3 and just thought again because im pregnant. heres the link
http://bacteriality.com/2007/09/15/vitamind/#3

anyways i just got excited to see someone saw and was takling about what i had come up with. i will not be taking vit d3 to see what happens and hopefully the blisters go away. i cant take this im about to scream!

I've wondered this myself. I've heard that sunlight causes cold sore outbreaks, but have never heard what it is about the sunlight that causes an outbreak. I imagined it was from the vitamin D and from what you've said here, it confirms that (at least in my mind). I've also read that high levels of vit D can trigger fibromylgia flare-ups, which causes your entire body, even your skin to hurt. You might want to get checked for that if you are having this reaction to D. I've read that fibro is caused by persistent, low-grade infection, possibly viral. Could even be related to the herpes virus. I always get a cold sore on the inside of my nose on the tail of a painful fibro flare-up and i think the two are tied together.

I imagine folks are careful to blame vitamin D for any health problems, as deficiency can cause more serious health problems than cold sores.

I began intake of vitamin D and Ca a couple of days before, and now I have problem on my upper lip - simple herpes. I did not have this problem during the long time. I think that vitamin D provoked this. I read that solar baths cause weakness of immune system and so provokes herpes. I think that it is connection between vitamin D and sun baths..