Additionally, B12 deficiency in infants can lead to lethargy, decreased appetite, and failure to thrive
However, some rare side effects of too much vitamin B12 can include: Headache Weakness Nausea Diarrhea Tingling sensations in the hands and feet Allergic reactions or skin rash (uncommon) When To Seek Medical Advice Risk of vitamin B12 deficiency: Groups at a higher risk of vitamin B12 deficiency include older adults, people who only eat plant-based foods (vegans and vegetarians), and those with certain chronic conditions (gastrointestinal disorders that can affect vitamin absorption)
One of the nutrient deficiencies that people with Hashimotos are particularly prone to is vitamin B12
Table 12 of the CY 2026 OPPS/ASC proposed rule (90 FR 33537) listed the APCs for which we proposed to make an exception under the 2 times rule for CY 2026 based on the criteria cited above and claims data submitted between January 1, 2024, and December 31, 2024, and CCRs, if available
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Summary: Why Do I Feel Worse After My B12 Injection
