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Keep vials in light-protected compartments of your refrigerator or freezer

It's a surprisingly common point of confusion

The benzyl alcohol preservative does the primary work of suppression, but lower temperatures reduce the growth rate the preservative must counteract

Kops et al., 2002

Excess ROS might be produced by the organism in response to pathogenic defenses, or it can be produced at normal levels but not neutralized due to the redox homeostasis system's limited antioxidant capacity

You can assess the effectiveness of treatment done by using vitamin b12 injection for cats through observable improvements or veterinary testing