vit b12 iv injection Compounded Methylcobalamin (Vitamin B12) Injection, 5mg/mL Vitamin B12
Description
(PubMed) Checchi S, Montanaro A, Ciuoli C, et al

Bright yellow urine is not usually a cause for concern
Injectable: 12 mg daily for 1624 weeks minimum

Also stated his opinion on every available paper
