are b12 injections free on the nhs Vitamin Dosage and Frequency Vitamin B12 Shots with Lipotropics:

Other good sources include salmon with 3 mcg for 3 ounces and tuna with 2.5 mcg for 3 ounces [1]

Consult with a qualified healthcare provider before starting any peptide protocol

I discuss this in my video The Best Type of Vitamin B12: Cyanocobalamin or Methylcobalamin

Injecting twice a day keeps the levels more stable throughout the day

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Second, and this is the critical change, an alpha-aminoisobutyric acid (Aib) substitution was placed at position 2 of the peptide chain