will b12 injection help a ckd cat Giving Your Vitamin Boost Stage 3 Kidney Disease :
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doi:10.1042/bse0340139

Can Trazodone be Habit-Forming or Addictive

The reactivation is most common during times when the patients immune system is less effective for example with age, immune suppression, chronic disease or other infections
Within 48 hours after injection of 100 or 1,000 mcg of vitamin B 12, 50 to 98% of the injected dose may appear in the urine

For most people the honest answer is: often at first, then much less often once your stores are refilled
