Posted 5/6/2014 11:45 AM (GMT -5)
The metabolism, functions and effects of magnesium, calcium, sodium and potassium are in many ways closely interconnected. As Opugirl stated, a deficiency in calcium or potassium can throw the synergy off and cause twitches as well.
If your blood levels for B12 are low and the SL supplements have not brought up the numbers, then injections are the way to go. However, if your B12 is normal then I would also consider Vitamin D levels as they along with Vitamin B12 are impacted by an infection.