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doi: 10.1136/rmdopen-2022-002348 51 GrasesFCosta-BauzaARoigJRodriguezA

However, you should: Call 999 or go to A&E immediately if you experience signs of a severe allergic reaction (difficulty breathing, severe throat/facial swelling, or collapse) Contact your GP if you experience a rash, itching, persistent pain at the injection site, or worsening neurological symptoms despite treatment If you suspect any side effects from your B12 injections, you can report them through the MHRA Yellow Card scheme (yellowcard.mhra.gov.uk)

Furthermore, quercetin is widely recognized in clinical research as a natural mast cell stabilizer

Evidence: The FDA notes that no safety-related information regarding immunogenicity has been identified to disprove this risk

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