b12 injection side effects urine color yellow after vitamin What's your urine trying to tell you? Its hue could be Optimal Vitamin B12 Dosage and – What are the – Symptoms of B12 Overdose: Causes

[15] [18] If you suspect your B12 supplement is causing diarrhoea, consider trying an alternative formulation or a different brand with fewer excipients

If a vial is multi-dose, follow the label or pharmacist instructions for how long it can be used after opening

For example, someone with a leaner build might need a shorter needle to ensure the injection is comfortable and delivered correctly

The timing, severity, and accompanying symptoms can provide valuable clues about whether the supplement is genuinely responsible or whether another cause should be investigated

Proper storage ensures the vitamin maintains its effectiveness, reducing the risk of administering an ineffective dose