too much b12 injections cats Giving Your Cat a Vitamin Boost Vitamin B12 for Cats: Overview,

Signs and symptoms of low blood sugar may include dizziness or light-headedness, sweating, confusion or drowsiness, headache, blurred vision, slurred speech, shakiness, fast heartbeat, anxiety, irritability, or mood changes, hunger, weakness and feeling jittery

However, most can also be administered via an oral drench, something thats useful if you only have a few individual animals that need to be treated

To treat mild deficiencies or to boost immunity, monthly maintenance doses may be enough to increase energy levels, optimize metabolism, and keep the immune system strong and healthy

This applies to brand-name products