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Here are just a few key functions of B12: Supports red blood cell formation and oxygen transport Helps maintain nerve function and brain health Plays a role in mood regulation and focus Supports energy metabolism and fat/protein breakdown When your body doesnt get enough, symptoms like fatigue, brain fog, irritability, and weakened immunity often show up

Accessed January 15, 2026 CNBC

If travel is a recurring concern, our GLP-1 travel and storage guide can help you prepare for different trip lengths

If you suspect an overdose, seek medical attention immediately

Research indicates that endogenous growth hormone secretion declines substantially with aging, with levels at age 70 approximately 60% lower than at age 20

They work together to supply your nerves with energy, keep them functioning smoothly, and help to repair nerve fibers and restore nerve function