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Early on, people may have mild symptoms they may think are caused by other common conditions

Other side effects: Other side effects may occur such as headache, confusion, and changes in heart rate

The research company ISR has developed an inhaled dry powder vaccine that does not require needles of cold chains [171], and researchers at Yonsei University have developed a sublingual dissolving microneedle [172]

This almost ensures full absorption, which helps people who struggle to get enough B12 from food or pills

Are there any negative effects of vitamin B12 supplementation

Many approaches focus only on calorie restriction, leaving the body fatigued and metabolically inefficient