can b12 injections cause sleeplessness Why Do I Feel Worse After My Injection? Causes & Management – Bolt Pharmacy does vitamin b12 injection cause
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If you've given up all animal products, you should consider using fortified cereals or nutritional yeasts or taking a vitamin B12 supplement

The evidence indicates their doses are therapeutically effective
[2] Pharmacokinetic studies demonstrate rapid systemic distribution with peak plasma levels occurring within 30-60 minutes of intramuscular injection, followed by extensive hepatic storage and enterohepatic recycling
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I am glad I did it and would do it again if I had to do it all over