Hi, all- Keep in mind that not all vitamin delivery systems are effective. There are a lot of different technologies available, and it's a good idea to try them all and see what works. To date, vitamin b12 can be utilized by getting regular injections (ouch!), vitamin b12 sublingual tablets (which I take now), nasal spray/gel or vitamin b12 patch. I myself have had the course of injections, which I hated, but were effective. Like I said, I take sublinguals now, but I feel like I am becoming deficient again. I am considering the b12 patch. (I really don't want to face that big fat needle again.) I will let you know how that works. LS.