I got severe vitamin b and d deficiency almost a year ago. My vitamin level was less than 100 pg/ml and vitamin d was 20 ng/ml. After taking supplements (neurobion plus & vitamin d shot) for 3 to 4 months it came to normal range (b12 came to 490 pg/ml & d3 came to 45ng/ml). The physician then suggested to take neurobion plus on and off for 15 days with a gap of couple of months to main b12 levels. I did not take any supplement from last three months and got the levels tested recently since I was getting fatigue and little tingling/numbness in feet and thigh My B12 came as 400 pg/ml & D3 came 30 ng/ml. Do I need to continue supplements. Please suggest supplement name, dose and duration..