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Vitamin B12 is considered crucial for maintaining a healthy immune system, as it helps produce white blood cells that are used to fight off infections and illnesses

Indications For use as a supplement source of B complex vitamins in cattle, horses, swine, sheep, dogs and cats

2.5 Quality assessment and risk of bias In line with PRISMA guidelines, the assessment of methodological quality was conducted to evaluate the strength of evidence, recognising that methodological limitations may introduce bias

[1] [4] Cognitive Function and Metabolic Health Brain function and metabolic health depend heavily on energy availability