more tired after b12 injection of feeling tired? 💭 Low energy and brain fog could be signs of low Vitamin B12. Our private Consultation helps support energy, focus, and overall wellbeing. Find out Why Do I Feel Worse

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B12 Supplements (MAJOR EFFECT) Oral B12 Supplements: Typical dose: 1000 mcg (1 mg) Absorption: ~1-2% passively absorbed (10-20 mcg from 1000 mcg dose) Effect on serum B12: Can increase by 100-300 pg/mL within 24 hours Peak effect: 4-8 hours after oral supplement Intramuscular B12 Injections: Dose: Usually 1000 mcg Effect: Massive increase in serum B12 Can reach 1000-5000 pg/mL within hours Sustained elevation for weeks Recommendation: Stop oral supplements 3-7 days before testing (ideally 7 days) Wait 1-2 weeks after injection before testing 2

I have been a vegetarian for over 40 years

Your care plan plays a significant role, as the dosage and frequency of injections depend on your medical needs