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Ampoules should be used immediately after opening
Legal and regulatory risks Not approved as a drug, supplement, or food in the US, EU, Australia, and other major markets
If you do opt for a self-test, make sure you check for the following: Check the test covers 'active B12' (the amount available for your body to use) rather than 'total B12' levels Check the blood testing laboratories used to test them are accredited by UKAS
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