The link from Janelle has more than just peanut.
I am going to just reiterate my horror at these products. I also am going to add my dissent in believing there is validity to the science behind these products that meets what I would consider something I would accept for my own children.
The idea that early introduction is what keeps a child from getting food allergies, including what amounts to recommending the implementation of a quasi home immunotherapy, marketed to play on parents fears and extract money without proven efficacy, promising a medical miracle, is disgusting to me.
Where is the data that actually shows that any product, or study, that promotes or uses early introduction, actually kept a child from developing food allergies? It isn't a given that a child will get them. You can't tell a child has them because some dot shows up on their forehead indicating their presence. So far, the studies I've seen, remove children who have life threatening food allergies before they start the study. Then the studies are left with kids that have either no food allergies, or the levels they are reading are the kids that likely would naturally grow out of them without any intervention in the first place.
And, just for the record, I found out all of my kids allergens before the recommended ages of introduction. We found out early. We found out so incredibly luckily because of the random odd exposure.... and not because we had fed them a direct quantity hidden in their food for the express purpose of seeing if they'd have a reaction. Which is a good thing because they all would have ended up dead.
Hold a baby, that can't walk or talk, look right into their little face and think about just how much experimenting you are willing to do in order to what? See if some little packet that you try and give them doesn't cause them to go into anaphylaxis? Just so that some company can make money telling you that if you feed your baby the contents they won't get food allergies. You will still be hoping that the first time you give it to them won't be the last time you feed them anything.
Edited to add: That telling people to eat something so they don't develop something they don't already have, and statistically aren't likely to develop if they don't already have it, is playing on people's fear. I think instead of everyone trying to find a way to make money off of parents thinking the worst thing in the world is for kids to have food allergies, some money should be spent trying to figure out how food allergies occur in the first place. Not to mention maybe developing better epinephrine auto-injectors made by different companies so that food allergic individuals aren't at the mercy of just a couple of companies and crappy medical coverage.