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For non-emergency concerns such as persistent injection site reactions or new neurological symptoms, contact your GP or NHS 111
With the exception of this, a tumorigenic effect has only been shown in the past in an animal experiment with rats (EFSA, 2006)
A 25 to 27 gauge needle is appropriate, as it minimizes discomfort and is sufficient for penetrating the subcutaneous layer without reaching the muscle
Long-Term Risks of Vitamin B12 Overdose Persistent skin issues Nervous system irritation Blood pressure changes Increased cardiovascular stress excessive supplementation without medical oversight
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