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When to seek medical advice: Persistent or worsening injection site reactions (increasing redness, warmth, or discharge suggesting infection) Severe or persistent headaches Chest pain or palpitations Unexplained muscle weakness or cramps New or worsening neurological symptoms despite treatment Unexpected bleeding or bruising For non-emergency concerns, contact your GP or NHS 111

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Tryptophan, for instance, helps the brain produce serotonin, which supports emotional stability and restful sleep

Documented effects on the vagus nerve and autonomic function are directly relevant to the dysautonomia seen in many long COVID patients

Can I use this combination long-term