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Negative side effects may include a paradoxical decrease in energy levels (most likely due to detoxification from methylation) or slight pain at the injection site which diminishes over 5-10 days
You'll be doing them a favor by ensuring they have the best possible opportunity of developing a healthy brain and body, and you'll be doing yourself a favor by getting enough vitamin B12
Brain and body disconnect: A retrospective case series of subacute combined degeneration of the spinal cord from chronic nitrous oxide use
The longer it sits, the greater the risk of potency loss or contamination
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