Vitamin B12 Intake and Deficiency Guidelines for Elderly Individuals

Recommended Intake

The European Food Safety Authority (EFSA) recommends 4 μg/day of vitamin B12 for elderly individuals 2, 1
The UK Reference Nutrient Intake (RNI) for vitamin B12 is lower at 1.5 μg/day 1
Recent comprehensive analyses suggest that intakes between 4.3 and 8.6 μg/day are associated with normal ranges of circulating functional markers 1
Studies in postmenopausal women indicate that an intake of 6 μg/day is required to normalize all vitamin B12 parameters in individuals with normal absorption capacity 1

Up to 20% of elderly individuals have atrophic gastritis, which impairs vitamin B12 absorption from food 1
Widespread use of antacids and proton pump inhibitors further reduces B12 absorption in this population 1
Studies show that 12-15% of elderly individuals have vitamin B12 deficiency despite seemingly adequate intake 1

Include natural food sources such as meat, milk and dairy foods in the diet 3, 1
Encourage use of fortified breakfast cereals as these are key contributors to B vitamin intakes in this age group 3, 2, 1
Consideration should be given to increasing the levels of fortification with vitamin B12 in order to optimize status of this nutrient 3

For elderly individuals with confirmed vitamin B12 deficiency and no neurological involvement, hydroxocobalamin 1 mg intramuscularly should be administered three times a week for 2 weeks, followed by maintenance treatment with 1 mg intramuscularly every 2-3 months 1
For those with neurological involvement, hydroxocobalamin 1 mg intramuscularly should be administered on alternate days until there is no further improvement, then hydroxocobalamin 1 mg intramuscularly every 2 months 1

A daily multivitamin supplement may be appropriate for elderly individuals, especially for those with reduced energy intake 4, 5
Individuals who consume less than 1500 kcal per day should be recommended a daily multivitamin supplementation since they often have difficulty meeting their micronutrient needs through regular food intake alone 6
Avoid treating folate deficiency before checking and treating vitamin B12 deficiency, as this may mask B12 deficiency and precipitate subacute combined degeneration of the spinal cord 1
Older subjects are more likely to have deficiencies in other micronutrients such as thiamine, folate, vitamin C, vitamin D, calcium, zinc, and magnesium, which may require comprehensive supplementation 4, 5

Regular monitoring of vitamin B12 status is recommended in elderly individuals, particularly those with risk factors for deficiency 1
The most reliable indicator of poor nutritional status in an elderly individual is change in body weight; involuntary gain or loss of >10 pounds or 10% of body weight in less than 6 months should be evaluated 4, 5