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High doses of B12, often used to treat deficiencies, may cause side effects such as headaches, nausea, diarrhea, fatigue or weakness, and tingling in the hands and feet
These include sarcoidosis, high phosphate blood levels, high calcium blood levels, excessive vitamin D levels, arteriosclerosis with occlusion of the arteries, kidney stones, kidney disease with reduced kidney function, and allergies to vitamin D
According to the National Institutes of Health, adults 19 to 50 years old should consume 2.4 micrograms of vitamin B12 per day, and those 51 and older should consume 3.0 micrograms daily
Helps with Fetal Development During Pregnancy: Studies indicate that lower B12 levels in pregnant women increases the risk of preterm birth and are associated with an increased risk of newborn low birth weight