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  1. Common colds: Learn More – Relief for a stuffy nose, cough and sore throat - InformedHealth.org - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK279542
    ... certain extracts of ivy, eucalyptus, primrose, pelargonium root (Umckaloabo) and thyme can at best slightly relieve a ... et al. A Comparison of the Efficacy and Safety of Non-Steroidal Anti-Inflammatory Drugs versus Acetaminophen ...
  2. Overview: Common colds - InformedHealth.org - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK279543
    ... herbal products like extracts taken from Pelargonium root (Umckaloabo, Zucol), primrose, thyme, eucalyptus and ivy leaves may ... et al. A Comparison of the Efficacy and Safety of Non-Steroidal Anti-Inflammatory Drugs versus Acetaminophen ...