can you purchase b12 injections CYANOCOBALAMIN Vitamin Injectable Solution for Horses, 5000-mcg, 100-mL - Easy Refills lethargy and skin or coat issues Vitamin B12 Injection - 10mL

You can certainly combine the shots in the same syringe, but I do not recommend it (unless you are an expert), because if you get an air bubble in the syringe, as you extract the liquid from the vial, you will need to slowly return the liquid into the vial and re-extract it again till theres no bubbles

No, there is no strong evidence that vitamin B12 causes insomnia when taken at night

Dogs/Cats - 0.25 to 0.5 mL

The B12 goes straight into muscle tissue

For DNA to be replicated for new cells, both folate and vitamin B12 can be limiting factors

AOD-9604 is a synthetic 16-amino-acid peptide corresponding to the C-terminal fragment (residues 177191) of human growth hormone, modified with an additional N-terminal tyrosine residue to improve stability