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B12 plays a key role in producing white blood cells, which help fight infection and reduce inflammation

Unlike other vitamins, the absorption of vitamin B12 depends on a protein produced in your stomach, called intrinsic factor

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Best Capsule Thorne Vitamin B12 Pros Third-party tested NSF-certified Gluten-free, dairy-free and soy-free Bioavailable form of B12 Cons Potential for multiple daily doses based on need Key Specs Delivery form: Capsule Dosage: 1 capsule, 13 times daily Servings per container: 60 Price: $22 Third-party tested: Yes Thorne vitamin B12 is third-party tested and NSF-certified, verifying that what is in the package matches the label