People with known sleep disorders : the metabolic activation effect can worsen insomnia if dosed late in the day
A single B12 shot continues to deliver benefits for roughly two to four weeks, with peak effects in the first week and a gradual taper after
You're a strong candidate for B12 injections if you experience any of the following: Persistent fatigue that sleep doesn't fix Brain fog, forgetfulness, or trouble concentrating Low mood, anxiety, or stress that feels disproportionate to what's happening Weight gain or difficulty losing weight despite consistent effort Tingling, numbness, or weakness in hands or feet (signs of B12-related neuropathy) Frequent colds, slow healing, or post-COVID fatigue A plant-based, vegetarian, or vegan diet Age 50 or older (B12 absorption naturally declines with age) A history of gastric bypass, Crohn's disease, celiac disease, or chronic acid reflux Long-term use of metformin (for diabetes), proton pump inhibitors (Prilosec, Nexium), or H2 blockers (Pepcid, Zantac) An MTHFR gene variant or known methylation issue A history of B12 deficiency, pernicious anemia, or low folate Hormonal shifts: perimenopause, menopause, postpartum If you fit one or more of these, a vitamin B12 shot is one of the lowest-risk, fastest-acting interventions available
Vitamin B12 is significantly influenced by the health of your brain system and red blood cells
It can be a slow IV push or an IV infusion
And because the tiredness was getting worse, the frequency of bowel movements would get worse, and Id lose more blood with every bowel movement. After speaking with an hematologist at the hospital in New York City where he worked, Bhargava tried intravenous iron infusions and vitamin B12 injections, treatments commonly used to counteract chemotherapy side effects
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