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En cas de doute, consulter votre mdecin

However, some nerve damage from long-term deficiency may be permanent

Many people have trouble with nutrient absorptionfrom supplements or fooddue to the presence of intestinal inflammation, poor gut health, or a deficiency of intrinsic factorsglycoprotein produced in the stomach thats essential for B12 absorption

This has occurred more than once

Some of these have been well meaning, though incompetent, and others nothing more than snake oil practicioners so by now I know who is genuine

Vitamin supplementation is for wellness only, and not intended to cure or treat disease