b12 injection administration needle size for a Injection: A Simple Guide Treating Severe Vitamin B12 Deficiency

Although further study of these interactions is necessary, patients receiving these agents concurrently should be monitored for the desired therapeutic response to vitamin B12

Or you might need to take a B12 supplement.

B12 injections can be a powerful tool in a comprehensive approach to weight loss, particularly when combined with a healthy diet and regular exercise

Doses of pyridoxine as low as 5-10 mg can antagonize levodopas effect if carbidopa is not present, so caution is warranted and any supplemental B beyond the nutritional dose should be under medical guidance

Although absorption is slower compared to IM injections, this method remains highly effective