Common and Systemic Side Effects Gastrointestinal Issues: The most common side effect of oral supplementation is mild, transient gastrointestinal (GI) discomfort, which can include mild bloating, cramping, loose stools, or general stomach upset
This vitamin is present in dairy products, liver, fish, and meat
If you add 2ml of bacteriostatic water to a 10mg vial, you have 5,000mcg per ml
With an oral supplement, the B12 needs to be absorbed through your digestive system first before getting to your blood, which takes a lot longer
However, many plant-based foods are fortified with vitamin B12, including some types of plant-based milk, breakfast cereals, and nutritional yeast
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