I started a cycle of Prop and Tren A before a month and stopped because of some headaches i had not related to juice(i had them before i start).

Now i am ok and would like to start again but 2 of the vials are half used.

Is there any degradation of the hormones or i run any risk of infection?

The vials were in my cupboard but the rubber stopper not covered with anything.

Have you done this?