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Individuals with certain medical conditions, such as kidney disease, liver disease, or heart disease, may not be suitable candidates for B12 injections

doi: 10.1001/archinte.163.3.286

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Does exactly what it should

Supplementation with rumen-protected methionine or choline during the transition period influences whole-blood immune response in periparturient dairy cows

Trougakos et al., 2021)