With intramuscular injections of B12, any excess will result in high levels within your blood so you may experience side effects such as headache, dizziness, tiredness, or gastrointestinal issues including nausea, until your body has metabolised any excess through your kidneys enroute to excretion via urine
A 0.3mL syringe works too, though 25 units sits near the top of its range
However, you should notice changes in your cat's everyday behavior: increased energy, less lethargy, better appetite
A qualified provider will evaluate your health to ensure treatment is appropriate and safe
Gently insert the needle into the peptide vial's rubber stopper
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