While there is no specific age limit for Vitamin B12 injections, the need for them often increases with age due to the bodys declining ability to naturally absorb the vitamin from food
This supports the idea of broader cardiovascular and healing effects in laboratory models
You can certainly combine the shots in the same syringe, but I do not recommend it (unless you are an expert), because if you get an air bubble in the syringe, as you extract the liquid from the vial, you will need to slowly return the liquid into the vial and re-extract it again till theres no bubbles
Signs of Vitamin B12 Deficiency Some common signs that you may be deficient in Vitamin B12 include fatigue or tiredness, weakness, difficulty concentrating or thinking clearly, pale skin, dizziness or light-headedness, loss of appetite, weight loss, constipation or diarrhea, numbness or tingling in the hands and feet, sore tongue, headaches and vision problems
The effects set in faster, requiring regular doses because of its extended half-life