There is no "cure" for allergies, no matter what some people say. There is no credible science that has proven any of the so-called cures that are claimed. Short of shutting down his immune system, your son will always have the potential for a reaction. But the allergic part of the immune system does get less reactive with avoidance, and also children's allergies do lessen as they get older. That is sometimes the basis for the claims of the cures that you see on the internet or advertised for sale, many times the children just grow out of them or the reaction gets better as they avoid the allergen. So only believe well controlled studies that use a larger group, not stories from satisfied customers.
Food allergies are extremely hard to live with, hard to diagnose, and hard to treat. And peanuts have become an ingredient that are used everywhere. I recommend checking on this web site for more information:
This organization is an excellent source of reliable information. They are the organization that most good allergists belong to.
Good luck, and please remember to carry your son's epi pen everywhere, tell people who are going to give him food about his allergy, and when he goes to school, make sure that you discuss your son's allergies with them.