I got the L-Lysine in the tube. It's called enisyl-f.. He is so mad at me he hides under the bed when I come near him!!!! Bless his little heart.... I feel so bad, I would rather try this than give him antibiotics and antihistamines for the rest of his life... I am such a push over and hate it when they get angry with me!!! This stuff is a thick dark brown goo in a tube!!! I don't know how were gonna get through this for a few months, Poor little guy is really going to hate me!