A few weeks ago I had my B12 and folic acid levels tested:
Folic acid 9.1 nmol/l
B12 154 pmol/l
Since then I've been taking B12 supplements, 1000 mcg a day. Last week I had my levels tested again:
Folic acid 17 nmol/l
B12 147 pmol/l
Not what I expected after supplementing. My doctor thinks it's no big deal, but by some standards I'm slipping into deficiency territory here. Does it simply take more time to get your levels back up?