The doctor can also check the levels of methylmalonic acid (MMA) and various substances to evaluate for vitamin B12 deficiency. These lab values help detect a vitamin B12 deficiency over the early stages. We hyperlink Key resources — like research, scientific references, and studies — inside of each report as https://helps-to-support-maternal53196.mysticwiki.com/816346/everything_about_supports_healthy_immune_system