Are there any studies concerning long-term effects of IM administration of vitamin k in newborns?
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Okay, not to slam the god hypothesis, you’re looking for studies, actual research, yes?
Go to and search there. If there are any decent studies (also some not-so-decent I’m sure will turn up), they’ll be there. While you’ll not likely be able to download the medical journal articles, from the abstracts you might be able to get an idea. But I’ll summarize for you 
Vitamin K has NOTHING TO DO WITH CIRCUMCISION, by the way. It has to do with blood clotting. (editing to add, okay, clotting issues could happen at circumcision, but generally if a baby is going to bleed out it’ll happen if no K shot, circ or no circ) There are two kinds of this – early and late. If your infant has the early clotting issue that vit.K assists with, he OR she will not survive without the shot – there is nothing to be done. This, luckily, is exceedingly rare. If I recall correctly, late bleeding issues are not as catastrophic, but preventable. More common, but still not frequent. There is no way to tell in advance if your child will have these problems.
In states where the K s hot is now optional, there have been infant deaths due to these problems where there were none when the shot was mandatory, but I can’t recall numbers.
Vitamin K shots are associated with – as of a year and a half ago – I think it was two infant deaths in the USA, and it had to do with dosing problems in both cases, I think.
Vitamin K doesn’t stick around long in the body, and there are no expected long-term effects. I haven’t read anything about generational effects (I assume you mean as in this will affect your child’s offspring or ability to have offspring), so either there weren’t any good studies (probable, given the time frame) or nothing was seen. As for asthma, the only link between K (it was K2) and asthma I found on a quick search is it being used as a therapy, not as causing.
After lots and lots of reading, I chose to go ahead with the K shot for my son when he was born. The risks of not giving him the shot, though small, still outweighed the risks of having the shot.
Ohhhh!!! Dont get me started on this one.. Unless you have a boy, there is no need for this. It’s a blood thickener, so check the link between asthma and the k shot.. God made it so that the blood that flows through the tiny veins and capillaries is nice and thin… The baby will get vit k after about 7 days if breast fed…That’s why in the Old Testament, they did not circ the boys until that time..God knew! Research it! Dont just ask the docs.. Look at both sides!