This Popular Vitamin Might Be Wreaking Have on Your Sleep, Experts Warn

By BethAnn Mayer, Oct 28, 2025

Taking vitamin B12 supplements may cause you to burn the midnight oil, experts warn. “Overly high levels of B12 can lead to sleep fragmentation and earlier waking,” explains Dr. Alex Dimitriu, MD, who is double board-certified in psychiatry and sleep medicine specialist and the founder of Menlo Park Psychiatry & Sleep Medicine.

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