Quick question for those that know about these things. My young lads B12 results show that he is below the low range level for B12. His are at 206 and the range starts from 210 upwards. His doc says to take B12 supplements which we've started but I was wondering if he shouldn't perhaps ask for b12 injections as a faster way of increasing his levels? Just not sure how fast the oral supplements generally work to increase it. What would you do?