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Still, side effects from B12 supplements are possible, especially at higher doses, and include: Headache Nausea Vomiting Fatigue Weakness Diarrhea Tingling in the hands and feet Nasal spray Vitamin B12 is also available in a nasal spray
B12 shots are far superior to oral forms of B12 due to the fact that they have superior absorption and quickly get into your target tissues (where B12 has its action)
A slowed metabolism and weight gain can occur for a variety of reasons, such as not eating enough calories, too much cortisol, high insulin levels, or thyroid problems
If you or your doctor suspect a vitamin or mineral deficiency, both conventional labs and direct-to-consumer companies offer micronutrient blood testing options
Inform your doctor if you have any history of liver-related problems before starting treatment
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