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Selenium also has a role in regulating thyroid gland function and the immune system
Andreasen CR, et al
Youre a strong candidate for B12 injections if you experience any of the following: Persistent fatigue that sleep doesnt fix Brain fog, forgetfulness, or trouble concentrating Low mood, anxiety, or stress that feels disproportionate Difficulty losing weight despite consistent effort Tingling, numbness, or weakness in hands or feet Frequent colds or slow recovery from illness A plant-based, vegetarian, or vegan diet Age 50+ (B12 absorption naturally declines with age) A history of gastric bypass, Crohns, or celiac disease Long-term use of metformin, proton pump inhibitors (Prilosec, Nexium), or H2 blockers (Pepcid, Zantac) If you fit one or more of these, a B12 shot is one of the lowest-risk, fastest-acting interventions available
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