I had some irritation at first, but stopped putting it near my gums and keep it under my tongue. I do not have any irritation under the tongue.

My personal, unscientific, opinion it that I prefer to do it sublingually and not chew it, I just feel it works better. Again, that is my own belief. As long as I am able to to it that way, I will.

Also, I am not deficient in B12 and I take 5mg a day.