Hi, I just read a comment about LT (Liquid Trust) and how somebody called Vero and they said that the

self life for LT is 8 to 12 months.

So that made me ask, Is there a "expiration date" for your phermones. Will

they work 3 to 4 years after I bought it. I am mainly concerned about the Popular ones like

Chikara
NPa
SOE

(liquid and Gel)
Alter Ego (Gel)

Can somebody comment?