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My prescription: tall glass of vino.

Presence and formation of cobalamin analogues in multivitamin-mineral pills.
H Kondo, M J Binder, J F Kolhouse, W R Smythe, E R Podell, and R H Allen
Because the origin of cobalamin (vitamin B12) analogues in animal chows and animal and human blood and tissues is unknown, we investigated the possibility that multivitamin interactions might convert cobalamin to cobalamin analogues. We homogenized three popular multivitamin-mineral pills in water, incubated them at 37 degrees C for 2 h, and isolated the cobalamin. Using paper chromatography we observed that 20-90% of the cobalamin was present as cobalamin analogues. Studies using CN-[57Co]cobalamin showed that these analogues were formed due to the concerted action of vitamin C, thiamine, and copper on CN-cobalamin. These cobalamin analogues are absorbed from the gastrointestinal tract of mice and either fail to stimulate or actually inhibit cobalamin-dependent enzymes when injected parenterally. We conclude that CN-cobalamin can be converted to potentially harmful cobalamin analogues by multivitamin-mineral interactions and that these interactions may be responsible for the presence of cobalamin analogues in animal chows and animal and human blood and tissues.

7.Low Vitamin B12 levels

Low vitamin B12 creates high levels of homocysteine in the blood (a sulfur containing amino acid) which damages the endothelium. An unbalanced diet, a strict vegetarian diet that excludes all meat, fish, dairy and eggs diet, or a diet overly reliant on processed foods, could all lead to low vitamin B12 levels, potentially damaging the endothelium20.
http://www.heart.org/HEARTORG/GettingHe ... rticle.jsp

But I do know that many of my MS symptoms improve 24hrs after B12 shot and begin to disappear 48 hours later.