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Diagnosis of cobalamin malabsorption usually involves bloodwork to measure serum cobalamin levels and may include genetic tests, especially for informed breeding decisions

If you have one or more risk factors for vitamin B12 deficiency, its helpful to talk with your healthcare professional about checking your B12 levels regularly

So, if you are eating a varied diet and do not have a laboratory-documented vitamin B12 deficiency, you do not need additional supplementation. However, she explains people who subscribe to strict vegan or vegetarian diets are much more likely to be at risk of vitamin B12 deficiency, and they should take supplemental B12, especially when pregnant or trying to become pregnant

Regulatory Status and Legal Considerations Regulatory status varies globally