cat b12 injection side effects Deficiency: more common than we think? — Our Pet's Health Vitamin B12 Deficiency in Cats:

As a cofactor, cobalamins are essential for two cellular reactions: the mitochondrial methylmalonyl-CoA mutase conversion of methylmalonic acid (MMA) to succinate, which links lipid and carbohydrate metabolism, and the activation of methionine synthase, which is the rate-limiting step in the synthesis of methionine from homocysteine and 5-methyltetrahydrofolate

What Side Effects or Risks Are Associated WithVitamin B12 Injection Dosage For Adults

SQ into pinched belly fat or outer thigh with a 1/2-inch insulin syringe, or IM into glutes or vastus lateralis with a 5/8-inch 2526g needle

It can also mean less medicine is needed

And when that happens, the consequences of low NAD+ really start to accelerate