A lack of vitamin B12 can cause neurological problems, which affect your nervous system, such as: vision problems. memory loss. pins and needles (paraesthesia)
Is taking high doses of B12 helpful or harmful? Since B12 is a water-soluble vitamin, it's generally considered safe, even at high doses. No Tolerable Upper Intake Level (UL) has been established for B12, due to its low level of toxicity.
extreme tiredness (fatigue) lack of energy (lethargy) breathlessness. feeling faint.
Key points about vitamin B12 deficiency anemia
Without enough oxygen, your body can't work as well. Symptoms include weak muscles, numbness, trouble walking, nausea, weight loss, irritability, fatigue, and increased heart rate.
Other medications can also interfere with your uptake of vitamin B12, possibly raising your risk for deficiency. These medications include antacids and peptic ulcer medications, cholesterol-lowering drugs, antiseizure medications, chemotherapy medications, the diabetes treatment glucophage (Metformin) and others.
Antibiotics, Tetracycline: Vitamin B12 should not be taken at the same time as tetracycline because it interferes with the absorption and effectiveness of this medication. Vitamin B12 should be taken at different times of the day from tetracycline.
The lowering effects of vitamin B12 together with folic acid on blood pressure have been reported in intervention study in adults. However, no study has reported the association of vitamin B12 by itself with systolic or diastolic blood pressure in children or in adults.
Your doctor will probably check your blood every now and then to make sure your B12 levels are normal. If you have pernicious anemia or another condition that doesn't go away, you may need shots or supplements forever. Your doctor will help you find the right plan to stay healthy.
Most women get the recommended daily amount — 2.4 micrograms (mcg) for most adults, 2.6 mcg for pregnant women, and 2.8 mcg for women who are breastfeeding — in their diets.