I have ordered many tubes of Viralys gel over this last year and found it made a great base for adding powder supplements to be syringed for my cats. This last order I received of 2 tubes, I noticed immediately that the color has changed to a very pale yellow instead of the orange-y color it used to be and the "liquidity" is now like that of thick hair gel! What is even more disturbing is that the "liquidity" is DIFFERENT in the 2 tubes I received! This would indicate a lack of quality control and a legit reason to be concerned about the integrity of this product at this time. 05/13/09