Subligual is under the tongue. I let it dissolve slowly. I had such a low level of B12 15 or more years ago that it was barely on the scale. I had shots and sublingual for years, now sublingual works great. Source Naturals is good. Methyl B12.

I had severe vertigo and problems from that low level. Reg. docs had no idea why. Makes me so sad I went through that, then CFS, then POTS. Finding integrative doctors are the key for me at least. He tested a LOT of things.

Things are better now. Docs seem to know more about B12, Vit D and others. So easy to prevent illness by checking the blood.