als b12 injections Should You Take Natural vs. Synthetic B12? Best Vitamin B12 Injection Sites:

Dosing concentrations designed for research titration , not calibrated for human pharmacokinetics a mismatch that has been linked in FDA adverse event reports to severe gastrointestinal illness and, in some cases, overdose from concentration errors

Low levels of vitamin B12 may be caused by: Pernicious anemia, a condition where a person's immune system mistakenly reduces their ability to absorb the vitamin

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Translational durability and long-term safety remain unresolved

Avoids Serious Complications In patients with severe anaemia, intensive treatment with B12 may result in a sudden drop in potassium (hypokalaemia), which can cause muscle weakness or an irregular heartbeat