title: [Double-blind randomized trial of the effect of Bidro on hay fever in children].
abstract: BACKGROUND
  The natural product royal jelly (trade name Bidro) is widely used for the treatment and prevention of allergic symptoms. Several case reports suggest marked clinical benefits. Our aim was to assess whether treatment with royal jelly modifies the development of allergic hay fever symptoms in children with pollen allergy.
  
  
  METHODS
  Eighty children aged 5-16 years with hay fever symptoms due to birch, grass and/or mugwort participated in a placebo-controlled, double-blind, randomized, controlled trial. Treatment with royal jelly or placebo was administered three to six months before and throughout the pollen season.
  
  
  RESULTS
  The primary outcome was the occurrence of symptoms of rhinitis and conjunctivitis in the pollen season. A secondary outcome was symptom severity, as measured by symptom score, by visual analog scale (VAS) and by the need for additional hay fever treatment. Sixty-four children completed the study; 34 of them had been treated with royal jelly and 30 with placebo. All of the patients in both groups developed hay fever symptoms during in the pollen season. The severity of hay fever symptoms was similar in the two groups (VAS = 1.6 in the placebo group and 1.4 in the royal jelly group; the mean number of combined daily nasal symptoms was 2.83 in the placebo group and 2.82 in the royal jelly group). The need for additional hay fever treatment was similar in the two groups.
  
  
  CONCLUSIONS
  We conclude that royal jelly has no effect on the occurrence of hay fever in the pollen season, nor does it modify the severity of hay fever symptoms.
authors.affiliation: Kolding Sygehus, Paediatrisk Forskningscenter, og Odense Universitetshospital, Børneafdelingen.
authors.forename: Anna Helene
authors.initials: AH
authors.lastname: Andersen
authors.forename: Sven
authors.initials: S
authors.lastname: Mortensen
authors.forename: Lone
authors.initials: L
authors.lastname: Agertoft
authors.forename: Søren
authors.initials: S
authors.lastname: Pedersen
mesh_terms: D002648:Child; D002675:Child, Preschool; D004311:Double-Blind Method; D005227:Fatty Acids / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D008297:Male; D006255:Rhinitis, Allergic, Seasonal / Q000188:drug therapy* / Q000517:prevention & control; D000099219:Royal Jelly
chemical_list: D005227:Fatty Acids; D000099219:Royal Jelly