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The most common side effects include: Loss of appetite Nausea Vomiting Diarrhea Other side effects can include: Dizziness Increased heart rate Infections Headaches Upset stomach Although rare, there are some serious side effects, including: Pancreatitis (inflammation of the pancreas) Medullary thyroid cancer Kidney injury Worsening diabetes-related retinopathy (eye disease) What are the risks
Clin Sci (Lond) 106(3):261268
Stress, fatigue and brain fog as well as reduced physical stamina are common side effects of Vitamin B12 deficiency
B12 directly supports cellular energy production, giving you sustained vitality throughout the day without caffeine crashes
Beyond these results in vitro , several clinical studies have also highlighted the benefits of L-carnitine for oily skin
