flax is a food and fiber crop that is grown in some regions of the world .
its value will account for its great popularity as a food , medical and cosmetic applications .
flax fibers are taken from the stem of the plant and are two to three times as strong as cotton . in this study
, we compared brain weight and plasma sex hormone levels in young and aged mice after the administration of linum usitatissimum ( flax seed ) hydro alcoholic extract .
in this study , 32 aged and 32 young mice were divided into 4 groups .
controls remained untreated and experimental groups were fed with flax seed hydroalcoholic extract by oral gavages during 3 weeks .
after 3 weeks , the brain was removed and blood samples were collected to measure sex hormone levels by elisa .
data analysis was done by statistical anova test using spss version 18 ( p<0.05 ) .
the results of this study shows that the brain weight of mice did not change significantly , but the sex hormone levels in the experimental groups in comparison with the control groups increased significantly ( p<0.05 ) .
the hydroalcoholic extract of flax seed had no effect on the brain weight , but this extract improved the sexual hormone levels .
 background : flax is a food and fiber crop that is grown in some regions of the world . its value will account for its great popularity as a food , medical and cosmetic applications . 
 flax fibers are taken from the stem of the plant and are two to three times as strong as cotton . in this study , we compared brain weight and plasma sex hormone levels in young and aged mice after the administration of linum usitatissimum ( flax seed ) hydro alcoholic extract.methods:in this study , 32 aged and 32 young mice were divided into 4 groups . 
 controls remained untreated and experimental groups were fed with flax seed hydroalcoholic extract by oral gavages during 3 weeks . 
 after 3 weeks , the brain was removed and blood samples were collected to measure sex hormone levels by elisa . 
 data analysis was done by statistical anova test using spss version 18 ( p<0.05).results : the results of this study shows that the brain weight of mice did not change significantly , but the sex hormone levels in the experimental groups in comparison with the control groups increased significantly ( p<0.05).conclusion : the hydroalcoholic extract of flax seed had no effect on the brain weight , but this extract improved the sexual hormone levels . 
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