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How can a laboratory select and use a pathway probe with enough confidence that observed biology is not simply an artifact of concentration drift, stability behavior, solvent mismatch, or assay interference

However, fortified breakfast cereals and fortified nutritional yeasts are readily available sources of vitamin B12 that have high bioavailability

Sub-optimal mineral balance at critical times, such as joining, lambing and when grazing improved pastures for rapid growth, can mean that accelerated trace mineral and vitamin requirements are not met for high-performing flocks

That, in plain English, is the whole story