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can b12 injections make you jittery Vitamin for Anxiety & Mood: What Science Says Vitamin B12 Injections | Energy
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FAQ Are B12 injections safe

Cyanocobalamin injections are injected into a muscle and the dosing is determined by your medical history during your Telemedicine consultation by the physician

Low active folate levels can lead to a build of of homocysteine and lack of methionine in the body and can lead to several health problems (more on high homocysteine levels can be found here)
Seek your doctor's advice for personalized guidance and assurance regarding usage
What is Vitamin B-12, and What are the Health Benefits