If you think you have a more severe deficiency, its best to see a doctor to get a better idea of the specific supplements your body needs.
What problems could my dog or cat have with Cyanocobalamin (Vitamin B12) Injection
I would not wait either
Reported side effects are generally mild and may include nausea, dizziness, headache, or injection site irritation
Extensive preclinical research shows TB-500 stimulates angiogenesis, promotes wound healing, reduces inflammation, inhibits apoptosis, and enhances tissue perfusion in models of muscle, tendon, ligament, and dermal injury
PubMed laboratory research record [PMID: 4362476] PubMed record related to this compound for laboratory literature review