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When your cat gets a B12 injection, it's the cyanocobalamin version

Clinical Benefits: Essential cofactor in fatty acid synthesis and energy metabolism Supports the integrity of keratin, the structural protein in hair and nails Involved in gluconeogenesis and blood glucose regulation Supports neurological function and nerve signalling May help address symptoms associated with biotin deficiency Intramuscular delivery ensures reliable absorption where oral intake is inadequate Your practitioner will assess whether biotin injections are clinically appropriate for your individual circumstances and recommend a treatment plan accordingly

For this reason, dosing timing relative to meals and exercise can influence metabolic outcomes

Because injections bypass the digestive tract, they may offer different absorption characteristics than oral routes, though the clinical significance of this is still being studied