is oral replacement better than injectable b12 Vitamin Injections vs. Supplements: Which Better? Should I get B12 injection

Metformin may result in suboptimal oral vitamin B12 absorption by competitively blocking the calcium-dependent binding of the intrinsic factor-vitamin B12 complex to its receptor

The effects last about 24-72 hours, depending on your metabolism and vitamin stores

This allows for greater flexibility in dosing or combinations, which may not be available with the standard commercial formulation

Remember, self-administered B12 injections and self-administered b12 shots are within your grasp

May be repurchased every 180 days

Eur J Pharm Sci 174:106201 Fasano A, Visanji NP, Liu LWC, Lang AE, Pfeiffer RF (2015) Gastrointestinal dysfunction in Parkinsons disease