Just as the title says ;P

I am curious if anyone here knows of a good subligual (disolved under the tongue to bypass digestion and go straight to the blood) b12 supplement that isn't made using any of the common food allergies such as wheat, dairy, corn, soy, eggs etc?

Also no addatives, except for whatever enzymes might be necessary if any.

It would be extremely helpful if someone could point me to a website or brand please. Thanks in advance ;P