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Intranasal Selank requires no such preliminary steps and is ready to use as is

Mild side effects, such as redness or irritation at the injection site, are rare and typically resolve on their own
Faecal microbiota transplantation for recurrent Clostridioides difficile infection: an updated systematic review and meta-analysis

If you experience any suspected side effects from B12 supplementation (such as injection site reactions, allergic responses, or other unexpected symptoms), report these through the MHRA Yellow Card scheme (yellowcard.mhra.gov.uk)
