Effect of a dietary supplement containing probiotic bacteria plus vitamins and minerals on common cold infections and cellular immune parameters.
OBJECTIVE
A randomized, double-blind, placebo-controlled intervention study was carried out in order to investigate whether consumption of a dietary supplement containing probiotic bacteria plus vitamins and minerals over a period of at least three months in winter/spring affects the duration, frequency, and severity of symptoms of naturally acquired common cold infections as well as cellular immune parameters.


METHODS
477 healthy men and women (aged 36 +/- 13, mean +/- SD) who had not been vaccinated against influenza were randomly assigned to a group who received daily the probiotic multivitamin and mineral supplement (verum) or a placebo, for three (n = 239) or for 5.5 months (n = 238). Cellular immune response was determined in 60 participants per study group by flow cytometry before and after 14 days of supplementation.


RESULTS
The incidence of respiratory tract infections regarded as being virally induced was 13.6% lower in the verum group compared to the placebo group (p = 0.07). During respiratory tract infection episodes, the subjects recorded common cold and influenza-like symptoms daily. All symptoms were reduced in the verum group. We found a relative reduction of 19% in the total symptom score (p = 0.12), 25% in influenza symptoms (p = 0.09), and 54% in the number of days with fever (p = 0.03). The duration of these infections was not affected. Leukocytes, lymphocytes, in particular T-lymphocytes including CD4+ and CD8+ cells, as well as monocytes were significantly higher increased in the verum group, during the first 14 days of supplementation compared to placebo.


CONCLUSIONS
These data indicate that the intake of a dietary supplement containing probiotic bacteria plus vitamins and minerals during a period of at least three months in winter/spring may reduce the incidence and the severity of symptoms in common cold infections in otherwise healthy adults. This may be due to stimulated cellular immunity.
Winkler
P
P
Institute for Physiology and Biochemistry of Nutrition, Federal Research Center for Nutrition and Food, Kiel, Germany.
de Vrese
M
M
Laue
Ch
Ch
Schrezenmeir
J
J
D000328:Adult; D015496:CD4-Positive T-Lymphocytes / Q000166:cytology / Q000187:drug effects; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000187:drug effects; D003139:Common Cold / Q000188:drug therapy* / Q000276:immunology / Q000517:prevention & control; D019587:Dietary Supplements; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D005260:Female; D005334:Fever / Q000517:prevention & control; D006801:Humans; D007111:Immunity, Cellular / Q000187:drug effects*; D018655:Lymphocyte Count; D008297:Male; D008875:Middle Aged; D008903:Minerals / Q000008:administration & dosage / Q000032:analysis / Q000627:therapeutic use*; D019936:Probiotics / Q000008:administration & dosage / Q000032:analysis / Q000627:therapeutic use*; D013607:Tablets; D013997:Time Factors; D016896:Treatment Outcome; D014815:Vitamins / Q000008:administration & dosage / Q000032:analysis / Q000627:therapeutic use*
D008903:Minerals; D013607:Tablets; D014815:Vitamins