b12 injections in pregnancy guidelines deficiency testing and management (Guidelines) Compounded Hydroxocobalamin (Vitamin B12) Injection

I have seen some improvement in my energy level but was hoping for more

Beyond-use dating Even if the color looks perfect, medication that has passed its beyond-use date should not be used

If the label says it contains B12 but the solution shows no color, either the B12 concentration is extremely low (possible but unusual), the B12 has degraded (possible if exposed to light), or there was a labeling error (possible at any pharmacy)

Metformin, commonly prescribed for type 2 diabetes, is known to reduce B12 absorption over time, as highlighted in MHRA safety updates

Is there a risk of overdose from B12 in this combo