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Huberman often discusses the roles of peptides in injury repair, gut health, and performance
Park SH, Huh TL, Kim SY, et al
Contact your GP if you experience: Unexpected symptoms after starting B12 supplementation, including persistent skin reactions, gastrointestinal disturbance, or mild allergic manifestations Neurological symptoms such as significant tingling, numbness, weakness, or balance problemsthese may indicate B12 deficiency paradoxically, or alternative neurological conditions requiring assessment Unexplained fatigue or malaise that develops or worsens despite supplementation Concerns about medication interactions , particularly if taking metformin, proton pump inhibitors, or other medications affecting B12 metabolism [2] [4] Seek emergency medical attention (call 999) if you develop signs of a severe allergic reaction following B12 injection, including facial swelling, difficulty breathing, or widespread urticaria
By Manuel Bowman Fact-checked by Payton Olsen Last updated June 2026
Conversely, if you reach your goal weight at 7.5mg, there is no reason to escalate further
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