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The Food and Nutrition Board has not established a Tolerable Upper Intake Level (UL) for vitamin B12 because of its low toxicity potential
B is needed for the production of neurotransmitters such as GABA, serotonin, and dopamine, and for glycogen breakdown and hemoglobin synthesis
A 2025 systematic review of the compound identified only 36 total studies, 35 of which were conducted on animals and just one single study (with a sample size of 12!) conducted on humans
The Role of B12 in Human Health Vitamin B12, also called cobalamin, is a water soluble vitamin found in animal products like meat, fish, dairy and eggs
Feeling sluggish or stuck in your weight loss routine
When your B12 levels are low, you may experience tiredness, weakness, trouble concentrating, or even mood changes
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