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And, indeed, when you put all the observational studies together, we find there is no signicant correlation between the levels of B12 in the blood and lung cancer, whether or not you smoked
The very best results were proven during the clinical trials to be seen about 4 weeks after the last treatment (which is 6 weeks from the start date, in total)
B12 injections are better for people with absorption issues or moderate-to-severe deficiency because they bypass the digestive system
Cyanocobalamin injections usually have 1000 mcg/ml of vitamin B12
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