The above-stated daily recommended limit is for people over the age of 14, but generally, with old age, a deficiency of vitamin B-12 is observed. Thus, it is advised that people over the age of 65 eat foods rich in the vitamin and take adequate supplements if necessary. Similarly, pregnant women and those breastfeeding might require higher levels of the vitamin as well. This figure is at 2.6 mcg for pregnant women, and for breastfeeding women, it is 2.8 mcg (16).