Answer
Methyl and propyl hydroxybenzoates in Covonia Catarrh Relief Formula may cause allergic reactions, possibly delayed.
Sources for this answer
- Covonia Catarrh Relief Formula / Natures Aid Herbal Catarrh Relief FormulaThornton & Ross Ltd · emc · SmPC §4.4 Special warnings and precautions for use · Version 6Document updated
Sources checked