Efficacy of chlorophyll c2 for seasonal allergic rhinitis: single-center double-blind randomized control trial.
Chlorophyll c2 extracted from Sargassum horneri improved allergic symptoms in an animal model of allergic rhinitis. In the present study, we explored the efficacy of chlorophyll c2 in patients with seasonal allergic rhinitis. This was a single-center, randomized, double-blind placebo-controlled trial. Sixty-six patients aged 20-43 years, each with a 2-year history of seasonal allergic rhinitis, were randomly assigned to receive either a single daily dose (0.7 mg) of chlorophyll c2 or placebo for 12 weeks. The use of medications including H1-antihistamines and topical nasal steroids was recorded by rescue medication scores (RMSs) noted after 4, 8, and 12 weeks of treatment. Disease-specific quality of life was measured using the Japan Rhinitis Quality of Life Questionnaire (JRQLQ) both before and after 4, 8, and 12 weeks of treatment. The RMS at 8 weeks was significantly better in the chlorophyll c2 than the placebo group (mean RMS difference = -3.09; 95 % confidence interval = -5.96 to -0.22); the mean RMS at 4 weeks was only slightly better in the chlorophyll c2 group. The JRQLQ scores did not differ significantly between the two groups. Chlorophyll c2 would have a potential to be an alternative treatment for allergic rhinitis.
Department of Otolaryngology, Kurashiki Central Hospital, 1-1-1 Miwa, Kurashiki, Okayama, 710-8602, Japan. t.fujiwarabi@gmail.com.
Takashi
T
Fujiwara
Department of Otorhinolaryngology, Head and Neck Surgery, Ehime University Graduate School of Medicine, Toon, Ehime, Japan.
Naoya
N
Nishida
Department of Otorhinolaryngology, Head and Neck Surgery, Ehime University Graduate School of Medicine, Toon, Ehime, Japan.
Jumpei
J
Nota
Department of Otorhinolaryngology, Head and Neck Surgery, Ehime University Graduate School of Medicine, Toon, Ehime, Japan.
Takashi
T
Kitani
Department of Otolaryngology, Uwajima City Hospital, Gotenmachi, Uwajima, Ehime, Japan.
Kunihide
K
Aoishi
Department of Otolaryngology, Takanoko Hospital, Matsuyama, Ehime, Japan.
Hirotaka
H
Takahashi
Department of Applied Lifescience, Faculty of Agriculture, Ehime University, Matsuyama, Ehime, Japan.
Takuya
T
Sugahara
Department of Otorhinolaryngology, Head and Neck Surgery, Ehime University Graduate School of Medicine, Toon, Ehime, Japan.
Naohito
N
Hato
D000328:Adult; D002734:Chlorophyll / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D011788:Quality of Life; D006255:Rhinitis, Allergic, Seasonal / Q000628:therapy*; D044647:Sargassum; D016037:Single-Blind Method; D011795:Surveys and Questionnaires; D013997:Time Factors; D055815:Young Adult
D002734:Chlorophyll; C064041:chlorophyll c
Allergic rhinitis; Chlorophyll c2; Complementary therapies; Sargassum horneri; Seaweed