Super B12-Complex - A highly absorbable blend of 3 bioactive forms of vitamin B12, with sublingual delivery Super B12-Complex has been expertly formulated to effectively raise cellular levels of this essential nutrient. The superior sublingual format delivers vitamin B12 directly to the bloodstream, bypassing absorption challenges in the gut. Different forms of B12 are required in different areas of the body, so we provide three naturally occurring and bioactive forms - methylcobalamin, adenosylcobalamin and hydroxocobalamin - for greater health coverage. Enhanced absorption bypasses the gut Standard absorption of vitamin B12 via the gut relies on several factors that can easily be compromised, and is limited to small quantities of B12 at any one time.