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Gut Variations This may be more effective when comparing B12 tablets vs sprays, because the environment of the gut differs from person to person

People with autoimmune disorders (especially thyroid disorders such as Hashimotos thyroiditis and Graves disease) Type 1 diabetes, vitiligo, lupus, Addisons disease, ulcerative colitis, infertility, acquired agammaglobulinemia, or a family history of these disorders

Approximately 6% of people under age 60 and 20% of people over age 60 are vitamin B12 deficient

USA suppliers familiar with customs requirements provide research-use declarations and harmonized tariff classifications

That process typically involves public comment periods and can take months to years to complete