b12 injections two types Not All Are Equal: What to Know Before Your Appointment – Timeless Wellbeing B12 Shots vs. IV Infusions:

5-Amino-1MQ Technical Data CAS Number: 702675-74-9 Molar mass: 206.25 g/mol Molecular formula: CHNO Chemical name: 5-Amino-1-methylquinolinium Research Applications 5-Amino-1MQ is used exclusively in laboratory environments, including: Experimental biochemistry studies Non-clinical metabolic research In vitro and in vivo laboratory assays (non-clinical) Scientific and academic research projects This product is not a drug and must not be used outside the scope of scientific research

However, adenosylcobalamin may be better at increasing B12 levels within the mitochondria, benefiting ME/CFS patients

doi: 10.3390/jcm7100304

[1] This discomfort is usually transient and can be minimized by using proper technique and allowing the solution to come to room temperature before injection