To get a truer picture, they often check for high levels of methylmalonic acid (MMA) and homocysteine
Any combination claim would require direct evidence for the exact compounds, ratio, formulation, route, dose, analytical method, safety profile, study population, and condition being studied
People at Risk of Vitamin B12 Deficiency Due to vitamin B12 requiring the protein "intrinsic factor" to be effectively used for the body, certain people are at higher risk of vitamin B12 deficiency than the general population
However, these small gaps can lead to chronic deficiencies over time
Glutathione for skin lightening shows growing evidence supporting its use