Nat Genet 2012
It should clearly state "U-100" or "insulin syringe." If the barrel markings show decimal values (0.1, 0.2, 0.3) rather than whole numbers (10, 20, 30), you likely have a TB syringe
For background and my updated recommendations, see: The Symptoms of Vitamin B12 Deficiency The Optimal Vitamin B12 Dosage for Adults Healthiest Food Sources of Vitamin B12 The Optimal Vitamin B12 Dosage for Kids, Pregnancy, and Seniors The Best Type of Vitamin B12: Cyanocobalamin or Methylcobalamin
Occasional dizziness, particularly when standing up too quickly after an injection
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