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It's not a furnace blast
In fact, as we have seen before, 1 to 5% of oral vitamin B12 is absorbed through passive way [4]
Additional studies were obtained from references of identified studies, the Cochrane Library and the ISI Web of Knowledge
Very high doses (such as those used for cyanide poisoning) should be used with caution and only if the potential benefit outweighs the risk
Some practitioners implement cycling approaches (such as 12 weeks on, 4-8 weeks off), though no published research directly compares continuous versus cycled protocols
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