Your Overall Health Underlying health conditions, such as gastrointestinal disorders (like Crohns disease, celiac disease, or atrophic gastritis) that impair nutrient absorption, or certain medications you may be taking, can influence how your body absorbs and utilizes B12
[3] However, B 12 deficiency in the elderly is a significant concern, and is related to dementia
Moreover, within the patient group, those who exhibited the specific POTS pattern during tilt-table testing had significantly lower B12 levels than those who did not
When this occurs, they may need supplements or B12 shots
With B12 shots, your body will absorb the vitamin fast and start making new red blood cells within 48 to 72 hours