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Therefore, we suggest that our case report may contribute to the formation of standardised desensitisation protocol in vitamin B12 allergy
That could change the situation
In comparison, oral B12 supplements must first pass through the digestive system
Check the powder color (should be blue to blue-purple), look for a third-party COA, verify HPLC testing, ensure the packaging is amber glass, and buy only from suppliers that disclose concentration and batch numbers
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