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The FDA's guidance on combination product devices notes that needle gauge selection for SQ delivery should prioritize the smallest gauge that delivers the full dose within 10 seconds of pressure [2]

Freeze rules: do not repeatedly freezethaw a reconstituted solution

At CoLaz, B12 injections are given by trained clinicians after a written consultation, and we will tell you when a GP visit and blood test should come first

The ampules you require are 1ml/mg

What are B12 injections and how do they benefit my health

Check out my videos The Optimal Vitamin B12 Dosage for Adults and The Optimal Vitamin B12 Dosage for Kids, Pregnancy, and Seniors which go into detail