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Whats the connection between MTHFR and vitamin B12 Folate and vitamin B12 are the most important cofactors working with enzymes in the methylation cycle

For exercise make sure you warm up before and cool down after, have good technique, and stay within your functional limits

Oral supplements can also work, but injections are often preferred

Cognitive function is not influenced by increasing caffeine dose

Neurologic degeneration associated with nitrous oxide anesthesia in patients with vitamin B12 deficiency

These side effects are typically very short-lived, if they occur at all, and should predictably resolve within 15 minutes of administration